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Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull SMP/hotplug changes from Ingo Molnar:
 "This is a pretty large, multi-arch series unifying and generalizing
  the various disjunct pieces of idle routines that architectures have
  historically copied from each other and have grown in random, wildly
  inconsistent and sometimes buggy directions:

   101 files changed, 455 insertions(+), 1328 deletions(-)

  this went through a number of review and test iterations before it was
  committed, it was tested on various architectures, was exposed to
  linux-next for quite some time - nevertheless it might cause problems
  on architectures that don't read the mailing lists and don't regularly
  test linux-next.

  This cat herding excercise was motivated by the -rt kernel, and was
  brought to you by Thomas "the Whip" Gleixner."

* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits)
  idle: Remove GENERIC_IDLE_LOOP config switch
  um: Use generic idle loop
  ia64: Make sure interrupts enabled when we "safe_halt()"
  sparc: Use generic idle loop
  idle: Remove unused ARCH_HAS_DEFAULT_IDLE
  bfin: Fix typo in arch_cpu_idle()
  xtensa: Use generic idle loop
  x86: Use generic idle loop
  unicore: Use generic idle loop
  tile: Use generic idle loop
  tile: Enter idle with preemption disabled
  sh: Use generic idle loop
  score: Use generic idle loop
  s390: Use generic idle loop
  powerpc: Use generic idle loop
  parisc: Use generic idle loop
  openrisc: Use generic idle loop
  mn10300: Use generic idle loop
  mips: Use generic idle loop
  microblaze: Use generic idle loop
  ...
This commit is contained in:
Linus Torvalds 2013-04-30 07:50:17 -07:00
parent 16fa94b532 d190e8195b
commit 8700c95adb
101 changed files with 461 additions and 1334 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/alpha/include/asm/thread_info.h
View File

@ -95,8 +95,6 @@ register struct thread_info *__current_thread_info __asm__("$8");
#define TS_POLLING 0x0010 /* idle task polling need_resched,
skip sending interrupt */
#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK 1
static inline void set_restore_sigmask(void)

19
arch/alpha/kernel/process.c
View File

@ -46,25 +46,6 @@
void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL(pm_power_off);
void
cpu_idle(void)
{
current_thread_info()->status |= TS_POLLING;
while (1) {
/* FIXME -- EV6 and LCA45 know how to power down
the CPU. */
rcu_idle_enter();
while (!need_resched())
cpu_relax();
rcu_idle_exit();
schedule_preempt_disabled();
}
}
struct halt_info {
int mode;
char *restart_cmd;

3
arch/alpha/kernel/smp.c
View File

@ -167,8 +167,7 @@ smp_callin(void)
cpuid, current, current->active_mm));
preempt_disable();
/* Do nothing. */
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
/* Wait until hwrpb->txrdy is clear for cpu. Return -1 on timeout. */

27
arch/arc/kernel/process.c
View File

@ -41,37 +41,12 @@ SYSCALL_DEFINE0(arc_gettls)
return task_thread_info(current)->thr_ptr;
}
static inline void arch_idle(void)
void arch_cpu_idle(void)
{
/* sleep, but enable all interrupts before committing */
__asm__("sleep 0x3");
}
void cpu_idle(void)
{
/* Since we SLEEP in idle loop, TIF_POLLING_NRFLAG can't be set */
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
doze:
local_irq_disable();
if (!need_resched()) {
arch_idle();
goto doze;
} else {
local_irq_enable();
}
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
}
asmlinkage void ret_from_fork(void);
/* Layout of Child kernel mode stack as setup at the end of this function is

2
arch/arc/kernel/smp.c
View File

@ -141,7 +141,7 @@ void __cpuinit start_kernel_secondary(void)
local_irq_enable();
preempt_disable();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
/*

1
arch/arm/Kconfig
View File

@ -15,6 +15,7 @@ config ARM
select GENERIC_IRQ_SHOW
select GENERIC_PCI_IOMAP
select GENERIC_SMP_IDLE_THREAD
select GENERIC_IDLE_POLL_SETUP
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HARDIRQS_SW_RESEND

3
arch/arm/include/asm/system_misc.h
View File

@ -21,9 +21,6 @@ extern void (*arm_pm_idle)(void);
extern unsigned int user_debug;
extern void disable_hlt(void);
extern void enable_hlt(void);
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_ARM_SYSTEM_MISC_H */

102
arch/arm/kernel/process.c
View File

@ -57,38 +57,6 @@ static const char *isa_modes[] = {
"ARM" , "Thumb" , "Jazelle", "ThumbEE"
};
static volatile int hlt_counter;
void disable_hlt(void)
{
hlt_counter++;
}
EXPORT_SYMBOL(disable_hlt);
void enable_hlt(void)
{
hlt_counter--;
BUG_ON(hlt_counter < 0);
}
EXPORT_SYMBOL(enable_hlt);
static int __init nohlt_setup(char *__unused)
{
hlt_counter = 1;
return 1;
}
static int __init hlt_setup(char *__unused)
{
hlt_counter = 0;
return 1;
}
__setup("nohlt", nohlt_setup);
__setup("hlt", hlt_setup);
extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);
typedef void (*phys_reset_t)(unsigned long);
@ -172,54 +140,38 @@ static void default_idle(void)
local_irq_enable();
}
/*
* The idle thread.
* We always respect 'hlt_counter' to prevent low power idle.
*/
void cpu_idle(void)
void arch_cpu_idle_prepare(void)
{
local_fiq_enable();
}
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
ledtrig_cpu(CPU_LED_IDLE_START);
while (!need_resched()) {
#ifdef CONFIG_HOTPLUG_CPU
if (cpu_is_offline(smp_processor_id()))
cpu_die();
#endif
/*
* We need to disable interrupts here
* to ensure we don't miss a wakeup call.
*/
local_irq_disable();
void arch_cpu_idle_enter(void)
{
ledtrig_cpu(CPU_LED_IDLE_START);
#ifdef CONFIG_PL310_ERRATA_769419
wmb();
wmb();
#endif
if (hlt_counter) {
local_irq_enable();
cpu_relax();
} else if (!need_resched()) {
stop_critical_timings();
if (cpuidle_idle_call())
default_idle();
start_critical_timings();
/*
* default_idle functions must always
* return with IRQs enabled.
*/
WARN_ON(irqs_disabled());
} else
local_irq_enable();
}
ledtrig_cpu(CPU_LED_IDLE_END);
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
}
void arch_cpu_idle_exit(void)
{
ledtrig_cpu(CPU_LED_IDLE_END);
}
#ifdef CONFIG_HOTPLUG_CPU
void arch_cpu_idle_dead(void)
{
cpu_die();
}
#endif
/*
* Called from the core idle loop.
*/
void arch_cpu_idle(void)
{
if (cpuidle_idle_call())
default_idle();
}
static char reboot_mode = 'h';

2
arch/arm/kernel/smp.c
View File

@ -336,7 +336,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
/*
* OK, it's off to the idle thread for us
*/
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
void __init smp_cpus_done(unsigned int max_cpus)

4
arch/arm/mach-gemini/idle.c
View File

@ -13,9 +13,11 @@ static void gemini_idle(void)
* will never wakeup... Acctualy it is not very good to enable
* interrupts first since scheduler can miss a tick, but there is
* no other way around this. Platforms that needs it for power saving
* should call enable_hlt() in init code, since by default it is
* should enable it in init code, since by default it is
* disabled.
*/
/* FIXME: Enabling interrupts here is racy! */
local_irq_enable();
cpu_do_idle();
}

4
arch/arm/mach-gemini/irq.c
View File

@ -15,6 +15,8 @@
#include <linux/stddef.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/cpu.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <asm/system_misc.h>
@ -77,7 +79,7 @@ void __init gemini_init_irq(void)
* Disable the idle handler by default since it is buggy
* For more info see arch/arm/mach-gemini/idle.c
*/
disable_hlt();
cpu_idle_poll_ctrl(true);
request_resource(&iomem_resource, &irq_resource);

3
arch/arm/mach-ixp4xx/common.c
View File

@ -29,6 +29,7 @@
#include <linux/io.h>
#include <linux/export.h>
#include <linux/gpio.h>
#include <linux/cpu.h>
#include <mach/udc.h>
#include <mach/hardware.h>
@ -239,7 +240,7 @@ void __init ixp4xx_init_irq(void)
* ixp4xx does not implement the XScale PWRMODE register
* so it must not call cpu_do_idle().
*/
disable_hlt();
cpu_idle_poll_ctrl(true);
/* Route all sources to IRQ instead of FIQ */
*IXP4XX_ICLR = 0x0;

6
arch/arm/mach-omap1/pm.c
View File

@ -43,6 +43,7 @@
#include <linux/module.h>
#include <linux/io.h>
#include <linux/atomic.h>
#include <linux/cpu.h>
#include <asm/fncpy.h>
#include <asm/system_misc.h>
@ -584,8 +585,7 @@ static void omap_pm_init_proc(void)
static int omap_pm_prepare(void)
{
/* We cannot sleep in idle until we have resumed */
disable_hlt();
cpu_idle_poll_ctrl(true);
return 0;
}
@ -621,7 +621,7 @@ static int omap_pm_enter(suspend_state_t state)
static void omap_pm_finish(void)
{
enable_hlt();
cpu_idle_poll_ctrl(false);
}

7
arch/arm/mach-omap2/omap_hwmod.c
View File

@ -138,6 +138,7 @@
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/bootmem.h>
#include <linux/cpu.h>
#include <asm/system_misc.h>
@ -2157,7 +2158,7 @@ static int _enable(struct omap_hwmod *oh)
if (soc_ops.enable_module)
soc_ops.enable_module(oh);
if (oh->flags & HWMOD_BLOCK_WFI)
disable_hlt();
cpu_idle_poll_ctrl(true);
if (soc_ops.update_context_lost)
soc_ops.update_context_lost(oh);
@ -2221,7 +2222,7 @@ static int _idle(struct omap_hwmod *oh)
_del_initiator_dep(oh, mpu_oh);
if (oh->flags & HWMOD_BLOCK_WFI)
enable_hlt();
cpu_idle_poll_ctrl(false);
if (soc_ops.disable_module)
soc_ops.disable_module(oh);
@ -2331,7 +2332,7 @@ static int _shutdown(struct omap_hwmod *oh)
_del_initiator_dep(oh, mpu_oh);
/* XXX what about the other system initiators here? dma, dsp */
if (oh->flags & HWMOD_BLOCK_WFI)
enable_hlt();
cpu_idle_poll_ctrl(false);
if (soc_ops.disable_module)
soc_ops.disable_module(oh);
_disable_clocks(oh);

5
arch/arm/mach-omap2/pm.c
View File

@ -218,7 +218,7 @@ static int omap_pm_enter(suspend_state_t suspend_state)
static int omap_pm_begin(suspend_state_t state)
{
disable_hlt();
cpu_idle_poll_ctrl(true);
if (cpu_is_omap34xx())
omap_prcm_irq_prepare();
return 0;
@ -226,8 +226,7 @@ static int omap_pm_begin(suspend_state_t state)
static void omap_pm_end(void)
{
enable_hlt();
return;
cpu_idle_poll_ctrl(false);
}
static void omap_pm_finish(void)

3
arch/arm/mach-orion5x/board-dt.c
View File

@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/cpu.h>
#include <asm/system_misc.h>
#include <asm/mach/arch.h>
#include <mach/orion5x.h>
@ -52,7 +53,7 @@ static void __init orion5x_dt_init(void)
*/
if (dev == MV88F5281_DEV_ID && rev == MV88F5281_REV_D0) {
printk(KERN_INFO "Orion: Applying 5281 D0 WFI workaround.\n");
disable_hlt();
cpu_idle_poll_ctrl(true);
}
if (of_machine_is_compatible("lacie,ethernet-disk-mini-v2"))

2
arch/arm/mach-orion5x/common.c
View File

@ -293,7 +293,7 @@ void __init orion5x_init(void)
*/
if (dev == MV88F5281_DEV_ID && rev == MV88F5281_REV_D0) {
printk(KERN_INFO "Orion: Applying 5281 D0 WFI workaround.\n");
disable_hlt();
cpu_idle_poll_ctrl(true);
}
/*

3
arch/arm/mach-shark/core.c
View File

@ -10,6 +10,7 @@
#include <linux/sched.h>
#include <linux/serial_8250.h>
#include <linux/io.h>
#include <linux/cpu.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
@ -130,7 +131,7 @@ static void __init shark_timer_init(void)
static void shark_init_early(void)
{
disable_hlt();
cpu_idle_poll_ctrl(true);
}
MACHINE_START(SHARK, "Shark")

6
arch/arm/mach-shmobile/suspend.c
View File

@ -12,6 +12,8 @@
#include <linux/suspend.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/cpu.h>
#include <asm/io.h>
#include <asm/system_misc.h>
@ -23,13 +25,13 @@ static int shmobile_suspend_default_enter(suspend_state_t suspend_state)
static int shmobile_suspend_begin(suspend_state_t state)
{
disable_hlt();
cpu_idle_poll_ctrl(true);
return 0;
}
static void shmobile_suspend_end(void)
{
enable_hlt();
cpu_idle_poll_ctrl(false);
}
struct platform_suspend_ops shmobile_suspend_ops = {

3
arch/arm/mach-w90x900/dev.c
View File

@ -19,6 +19,7 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/cpu.h>
#include <linux/mtd/physmap.h>
#include <linux/mtd/mtd.h>
@ -531,7 +532,7 @@ static struct platform_device *nuc900_public_dev[] __initdata = {
void __init nuc900_board_init(struct platform_device **device, int size)
{
disable_hlt();
cpu_idle_poll_ctrl(true);
platform_add_devices(device, size);
platform_add_devices(nuc900_public_dev, ARRAY_SIZE(nuc900_public_dev));
spi_register_board_info(nuc900_spi_board_info,

43
arch/arm64/kernel/process.c
View File

@ -84,11 +84,15 @@ EXPORT_SYMBOL_GPL(pm_power_off);
void (*pm_restart)(const char *cmd);
EXPORT_SYMBOL_GPL(pm_restart);
void arch_cpu_idle_prepare(void)
{
local_fiq_enable();
}
/*
* This is our default idle handler.
*/
static void default_idle(void)
void arch_cpu_idle(void)
{
/*
* This should do all the clock switching and wait for interrupt
@ -98,43 +102,6 @@ static void default_idle(void)
local_irq_enable();
}
/*
* The idle thread.
* We always respect 'hlt_counter' to prevent low power idle.
*/
void cpu_idle(void)
{
local_fiq_enable();
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched()) {
/*
* We need to disable interrupts here to ensure
* we don't miss a wakeup call.
*/
local_irq_disable();
if (!need_resched()) {
stop_critical_timings();
default_idle();
start_critical_timings();
/*
* default_idle functions should always return
* with IRQs enabled.
*/
WARN_ON(irqs_disabled());
} else {
local_irq_enable();
}
}
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
}
void machine_shutdown(void)
{
#ifdef CONFIG_SMP

2
arch/arm64/kernel/smp.c
View File

@ -216,7 +216,7 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
/*
* OK, it's off to the idle thread for us
*/
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
void __init smp_cpus_done(unsigned int max_cpus)

13
arch/avr32/kernel/process.c
View File

@ -30,18 +30,9 @@ EXPORT_SYMBOL(pm_power_off);
* This file handles the architecture-dependent parts of process handling..
*/
void cpu_idle(void)
void arch_cpu_idle(void)
{
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched())
cpu_idle_sleep();
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
cpu_enter_idle();
}
void machine_halt(void)

9
arch/avr32/kernel/time.c
View File

@ -12,6 +12,7 @@
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/cpu.h>
#include <asm/sysreg.h>
@ -87,13 +88,17 @@ static void comparator_mode(enum clock_event_mode mode,
pr_debug("%s: start\n", evdev->name);
/* FALLTHROUGH */
case CLOCK_EVT_MODE_RESUME:
cpu_disable_idle_sleep();
/*
* If we're using the COUNT and COMPARE registers we
* need to force idle poll.
*/
cpu_idle_poll_ctrl(true);
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
sysreg_write(COMPARE, 0);
pr_debug("%s: stop\n", evdev->name);
cpu_enable_idle_sleep();
cpu_idle_poll_ctrl(false);
break;
default:
BUG();

24
arch/avr32/mach-at32ap/include/mach/pm.h
View File

@ -21,30 +21,6 @@
extern void cpu_enter_idle(void);
extern void cpu_enter_standby(unsigned long sdramc_base);
extern bool disable_idle_sleep;
static inline void cpu_disable_idle_sleep(void)
{
disable_idle_sleep = true;
}
static inline void cpu_enable_idle_sleep(void)
{
disable_idle_sleep = false;
}
static inline void cpu_idle_sleep(void)
{
/*
* If we're using the COUNT and COMPARE registers for
* timekeeping, we can't use the IDLE state.
*/
if (disable_idle_sleep)
cpu_relax();
else
cpu_enter_idle();
}
void intc_set_suspend_handler(unsigned long offset);
#endif

7
arch/avr32/mach-at32ap/pm-at32ap700x.S
View File

@ -18,13 +18,6 @@
/* Same as 0xfff00000 but fits in a 21 bit signed immediate */
#define PM_BASE -0x100000
.section .bss, "wa", @nobits
.global disable_idle_sleep
.type disable_idle_sleep, @object
disable_idle_sleep:
.int 4
.size disable_idle_sleep, . - disable_idle_sleep
/* Keep this close to the irq handlers */
.section .irq.text, "ax", @progbits

32
arch/blackfin/kernel/process.c
View File

@ -46,15 +46,14 @@ EXPORT_SYMBOL(pm_power_off);
* The idle loop on BFIN
*/
#ifdef CONFIG_IDLE_L1
static void default_idle(void)__attribute__((l1_text));
void cpu_idle(void)__attribute__((l1_text));
void arch_cpu_idle(void)__attribute__((l1_text));
#endif
/*
* This is our default idle handler. We need to disable
* interrupts here to ensure we don't miss a wakeup call.
*/
static void default_idle(void)
void arch_cpu_idle(void)
{
#ifdef CONFIG_IPIPE
ipipe_suspend_domain();
@ -66,31 +65,12 @@ static void default_idle(void)
hard_local_irq_enable();
}
/*
* The idle thread. We try to conserve power, while trying to keep
* overall latency low. The architecture specific idle is passed
* a value to indicate the level of "idleness" of the system.
*/
void cpu_idle(void)
{
/* endless idle loop with no priority at all */
while (1) {
#ifdef CONFIG_HOTPLUG_CPU
if (cpu_is_offline(smp_processor_id()))
cpu_die();
#endif
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched())
default_idle();
rcu_idle_exit();
tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
}
void arch_cpu_idle_dead(void)
{
cpu_die();
}
#endif
/*
* Do necessary setup to start up a newly executed thread.

2
arch/blackfin/mach-common/smp.c
View File

@ -335,7 +335,7 @@ void __cpuinit secondary_start_kernel(void)
*/
calibrate_delay();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
void __init smp_prepare_boot_cpu(void)

28
arch/c6x/kernel/process.c
View File

@ -33,7 +33,7 @@ extern asmlinkage void ret_from_kernel_thread(void);
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
static void c6x_idle(void)
void arch_cpu_idle(void)
{
unsigned long tmp;
@ -49,32 +49,6 @@ static void c6x_idle(void)
: "=b"(tmp));
}
/*
* The idle loop for C64x
*/
void cpu_idle(void)
{
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (1) {
local_irq_disable();
if (need_resched()) {
local_irq_enable();
break;
}
c6x_idle(); /* enables local irqs */
}
rcu_idle_exit();
tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
}
}
static void halt_loop(void)
{
printk(KERN_EMERG "System Halted, OK to turn off power\n");

3
arch/cris/arch-v10/kernel/process.c
View File

@ -30,8 +30,9 @@ void etrax_gpio_wake_up_check(void); /* drivers/gpio.c */
void default_idle(void)
{
#ifdef CONFIG_ETRAX_GPIO
etrax_gpio_wake_up_check();
etrax_gpio_wake_up_check();
#endif
local_irq_enable();
}
/*

12
arch/cris/arch-v32/kernel/process.c
View File

@ -20,18 +20,12 @@
extern void stop_watchdog(void);
extern int cris_hlt_counter;
/* We use this if we don't have any better idle routine. */
void default_idle(void)
{
local_irq_disable();
if (!need_resched() && !cris_hlt_counter) {
/* Halt until exception. */
__asm__ volatile("ei \n\t"
"halt ");
}
local_irq_enable();
/* Halt until exception. */
__asm__ volatile("ei \n\t"
"halt ");
}
/*

4
arch/cris/arch-v32/kernel/smp.c
View File

@ -145,8 +145,6 @@ smp_boot_one_cpu(int cpuid, struct task_struct idle)
* specific stuff such as the local timer and the MMU. */
void __init smp_callin(void)
{
extern void cpu_idle(void);
int cpu = cpu_now_booting;
reg_intr_vect_rw_mask vect_mask = {0};
@ -170,7 +168,7 @@ void __init smp_callin(void)
local_irq_enable();
set_cpu_online(cpu, true);
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
/* Stop execution on this CPU.*/

7
arch/cris/include/asm/processor.h
View File

@ -65,13 +65,6 @@ static inline void release_thread(struct task_struct *dead_task)
#define cpu_relax() barrier()
/*
* disable hlt during certain critical i/o operations
*/
#define HAVE_DISABLE_HLT
void disable_hlt(void);
void enable_hlt(void);
void default_idle(void);
#endif /* __ASM_CRIS_PROCESSOR_H */

49
arch/cris/kernel/process.c
View File

@ -29,59 +29,14 @@
//#define DEBUG
/*
* The hlt_counter, disable_hlt and enable_hlt is just here as a hook if
* there would ever be a halt sequence (for power save when idle) with
* some largish delay when halting or resuming *and* a driver that can't
* afford that delay. The hlt_counter would then be checked before
* executing the halt sequence, and the driver marks the unhaltable
* region by enable_hlt/disable_hlt.
*/
int cris_hlt_counter=0;
void disable_hlt(void)
{
cris_hlt_counter++;
}
EXPORT_SYMBOL(disable_hlt);
void enable_hlt(void)
{
cris_hlt_counter--;
}
EXPORT_SYMBOL(enable_hlt);
extern void default_idle(void);
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
/*
* The idle thread. There's no useful work to be
* done, so just try to conserve power and have a
* low exit latency (ie sit in a loop waiting for
* somebody to say that they'd like to reschedule)
*/
void cpu_idle (void)
void arch_cpu_idle(void)
{
/* endless idle loop with no priority at all */
while (1) {
rcu_idle_enter();
while (!need_resched()) {
/*
* Mark this as an RCU critical section so that
* synchronize_kernel() in the unload path waits
* for our completion.
*/
default_idle();
}
rcu_idle_exit();
schedule_preempt_disabled();
}
default_idle();
}
void hard_reset_now (void);

27
arch/frv/kernel/process.c
View File

@ -59,29 +59,12 @@ static void core_sleep_idle(void)
mb();
}
void (*idle)(void) = core_sleep_idle;
/*
* The idle thread. There's no useful work to be
* done, so just try to conserve power and have a
* low exit latency (ie sit in a loop waiting for
* somebody to say that they'd like to reschedule)
*/
void cpu_idle(void)
void arch_cpu_idle(void)
{
/* endless idle loop with no priority at all */
while (1) {
rcu_idle_enter();
while (!need_resched()) {
check_pgt_cache();
if (!frv_dma_inprogress && idle)
idle();
}
rcu_idle_exit();
schedule_preempt_disabled();
}
if (!frv_dma_inprogress)
core_sleep_idle();
else
local_irq_enable();
}
void machine_restart(char * __unused)

35
arch/h8300/kernel/process.c
View File

@ -53,40 +53,13 @@ asmlinkage void ret_from_kernel_thread(void);
* The idle loop on an H8/300..
*/
#if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM)
static void default_idle(void)
void arch_cpu_idle(void)
{
local_irq_disable();
if (!need_resched()) {
local_irq_enable();
/* XXX: race here! What if need_resched() gets set now? */
__asm__("sleep");
} else
local_irq_enable();
}
#else
static void default_idle(void)
{
cpu_relax();
local_irq_enable();
/* XXX: race here! What if need_resched() gets set now? */
__asm__("sleep");
}
#endif
void (*idle)(void) = default_idle;
/*
* The idle thread. There's no useful work to be
* done, so just try to conserve power and have a
* low exit latency (ie sit in a loop waiting for
* somebody to say that they'd like to reschedule)
*/
void cpu_idle(void)
{
while (1) {
rcu_idle_enter();
while (!need_resched())
idle();
rcu_idle_exit();
schedule_preempt_disabled();
}
}
void machine_restart(char * __unused)
{

23
arch/hexagon/kernel/process.c
View File

@ -51,28 +51,11 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
* If hardware or VM offer wait termination even though interrupts
* are disabled.
*/
static void default_idle(void)
void arch_cpu_idle(void)
{
__vmwait();
}
void (*idle_sleep)(void) = default_idle;
void cpu_idle(void)
{
while (1) {
tick_nohz_idle_enter();
local_irq_disable();
while (!need_resched()) {
idle_sleep();
/* interrupts wake us up, but aren't serviced */
local_irq_enable(); /* service interrupt */
local_irq_disable();
}
local_irq_enable();
tick_nohz_idle_exit();
schedule();
}
/* interrupts wake us up, but irqs are still disabled */
local_irq_enable();
}
/*

2
arch/hexagon/kernel/smp.c
View File

@ -184,7 +184,7 @@ void __cpuinit start_secondary(void)
local_irq_enable();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}

1
arch/ia64/include/asm/irqflags.h
View File

@ -89,6 +89,7 @@ static inline bool arch_irqs_disabled(void)
static inline void arch_safe_halt(void)
{
arch_local_irq_enable();
ia64_pal_halt_light(); /* PAL_HALT_LIGHT */
}

2
arch/ia64/include/asm/thread_info.h
View File

@ -131,8 +131,6 @@ struct thread_info {
#define TS_POLLING 1 /* true if in idle loop and not sleeping */
#define TS_RESTORE_SIGMASK 2 /* restore signal mask in do_signal() */
#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK 1
static inline void set_restore_sigmask(void)

14
arch/ia64/kernel/perfmon.c
View File

@ -42,6 +42,7 @@
#include <linux/completion.h>
#include <linux/tracehook.h>
#include <linux/slab.h>
#include <linux/cpu.h>
#include <asm/errno.h>
#include <asm/intrinsics.h>
@ -1322,8 +1323,6 @@ out:
}
EXPORT_SYMBOL(pfm_unregister_buffer_fmt);
extern void update_pal_halt_status(int);
static int
pfm_reserve_session(struct task_struct *task, int is_syswide, unsigned int cpu)
{
@ -1371,9 +1370,9 @@ pfm_reserve_session(struct task_struct *task, int is_syswide, unsigned int cpu)
cpu));
/*
* disable default_idle() to go to PAL_HALT
* Force idle() into poll mode
*/
update_pal_halt_status(0);
cpu_idle_poll_ctrl(true);
UNLOCK_PFS(flags);
@ -1430,11 +1429,8 @@ pfm_unreserve_session(pfm_context_t *ctx, int is_syswide, unsigned int cpu)
is_syswide,
cpu));
/*
* if possible, enable default_idle() to go into PAL_HALT
*/
if (pfm_sessions.pfs_task_sessions == 0 && pfm_sessions.pfs_sys_sessions == 0)
update_pal_halt_status(1);
/* Undo forced polling. Last session reenables pal_halt */
cpu_idle_poll_ctrl(false);
UNLOCK_PFS(flags);

78
arch/ia64/kernel/process.c
View File

@ -209,41 +209,13 @@ do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
local_irq_disable(); /* force interrupt disable */
}
static int pal_halt = 1;
static int can_do_pal_halt = 1;
static int __init nohalt_setup(char * str)
{
pal_halt = can_do_pal_halt = 0;
cpu_idle_poll_ctrl(true);
return 1;
}
__setup("nohalt", nohalt_setup);
void
update_pal_halt_status(int status)
{
can_do_pal_halt = pal_halt && status;
}
/*
* We use this if we don't have any better idle routine..
*/
void
default_idle (void)
{
local_irq_enable();
while (!need_resched()) {
if (can_do_pal_halt) {
local_irq_disable();
if (!need_resched()) {
safe_halt();
}
local_irq_enable();
} else
cpu_relax();
}
}
#ifdef CONFIG_HOTPLUG_CPU
/* We don't actually take CPU down, just spin without interrupts. */
static inline void play_dead(void)
@ -270,47 +242,29 @@ static inline void play_dead(void)
}
#endif /* CONFIG_HOTPLUG_CPU */
void __attribute__((noreturn))
cpu_idle (void)
void arch_cpu_idle_dead(void)
{
play_dead();
}
void arch_cpu_idle(void)
{
void (*mark_idle)(int) = ia64_mark_idle;
int cpu = smp_processor_id();
/* endless idle loop with no priority at all */
while (1) {
rcu_idle_enter();
if (can_do_pal_halt) {
current_thread_info()->status &= ~TS_POLLING;
/*
* TS_POLLING-cleared state must be visible before we
* test NEED_RESCHED:
*/
smp_mb();
} else {
current_thread_info()->status |= TS_POLLING;
}
if (!need_resched()) {
#ifdef CONFIG_SMP
min_xtp();
min_xtp();
#endif
rmb();
if (mark_idle)
(*mark_idle)(1);
rmb();
if (mark_idle)
(*mark_idle)(1);
default_idle();
if (mark_idle)
(*mark_idle)(0);
safe_halt();
if (mark_idle)
(*mark_idle)(0);
#ifdef CONFIG_SMP
normal_xtp();
normal_xtp();
#endif
}
rcu_idle_exit();
schedule_preempt_disabled();
check_pgt_cache();
if (cpu_is_offline(cpu))
play_dead();
}
}
void

2
arch/ia64/kernel/smpboot.c
View File

@ -455,7 +455,7 @@ start_secondary (void *unused)
preempt_disable();
smp_callin();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
return 0;
}

18
arch/m32r/kernel/process.c
View File

@ -47,24 +47,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
void (*pm_power_off)(void) = NULL;
EXPORT_SYMBOL(pm_power_off);
/*
* The idle thread. There's no useful work to be
* done, so just try to conserve power and have a
* low exit latency (ie sit in a loop waiting for
* somebody to say that they'd like to reschedule)
*/
void cpu_idle (void)
{
/* endless idle loop with no priority at all */
while (1) {
rcu_idle_enter();
while (!need_resched())
cpu_relax();
rcu_idle_exit();
schedule_preempt_disabled();
}
}
void machine_restart(char *__unused)
{
#if defined(CONFIG_PLAT_MAPPI3)

2
arch/m32r/kernel/smpboot.c
View File

@ -432,7 +432,7 @@ int __init start_secondary(void *unused)
*/
local_flush_tlb_all();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
return 0;
}

32
arch/m68k/kernel/process.c
View File

@ -51,40 +51,16 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
return sw->retpc;
}
/*
* The idle loop on an m68k..
*/
static void default_idle(void)
void arch_cpu_idle(void)
{
if (!need_resched())
#if defined(MACH_ATARI_ONLY)
/* block out HSYNC on the atari (falcon) */
__asm__("stop #0x2200" : : : "cc");
/* block out HSYNC on the atari (falcon) */
__asm__("stop #0x2200" : : : "cc");
#else
__asm__("stop #0x2000" : : : "cc");
__asm__("stop #0x2000" : : : "cc");
#endif
}
void (*idle)(void) = default_idle;
/*
* The idle thread. There's no useful work to be
* done, so just try to conserve power and have a
* low exit latency (ie sit in a loop waiting for
* somebody to say that they'd like to reschedule)
*/
void cpu_idle(void)
{
/* endless idle loop with no priority at all */
while (1) {
rcu_idle_enter();
while (!need_resched())
idle();
rcu_idle_exit();
schedule_preempt_disabled();
}
}
void machine_restart(char * __unused)
{
if (mach_reset)

2
arch/metag/include/asm/thread_info.h
View File

@ -150,6 +150,4 @@ static inline int kstack_end(void *addr)
#define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
_TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif /* _ASM_THREAD_INFO_H */

35
arch/metag/kernel/process.c
View File

@ -22,6 +22,7 @@
#include <linux/pm.h>
#include <linux/syscalls.h>
#include <linux/uaccess.h>
#include <linux/smp.h>
#include <asm/core_reg.h>
#include <asm/user_gateway.h>
#include <asm/tcm.h>
@ -31,7 +32,7 @@
/*
* Wait for the next interrupt and enable local interrupts
*/
static inline void arch_idle(void)
void arch_cpu_idle(void)
{
int tmp;
@ -59,36 +60,12 @@ static inline void arch_idle(void)
: "r" (get_trigger_mask()));
}
void cpu_idle(void)
{
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched()) {
/*
* We need to disable interrupts here to ensure we don't
* miss a wakeup call.
*/
local_irq_disable();
if (!need_resched()) {
#ifdef CONFIG_HOTPLUG_CPU
if (cpu_is_offline(smp_processor_id()))
cpu_die();
#endif
arch_idle();
} else {
local_irq_enable();
}
}
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
void arch_cpu_idle_dead(void)
{
cpu_die();
}
#endif
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);

2
arch/metag/kernel/smp.c
View File

@ -297,7 +297,7 @@ asmlinkage void secondary_start_kernel(void)
/*
* OK, it's off to the idle thread for us
*/
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
void __init smp_cpus_done(unsigned int max_cpus)

1
arch/microblaze/Kconfig
View File

@ -26,6 +26,7 @@ config MICROBLAZE
select GENERIC_CPU_DEVICES
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
select GENERIC_IDLE_POLL_SETUP
select MODULES_USE_ELF_RELA
select CLONE_BACKWARDS

5
arch/microblaze/include/asm/processor.h
View File

@ -22,7 +22,6 @@
extern const struct seq_operations cpuinfo_op;
# define cpu_relax() barrier()
# define cpu_sleep() do {} while (0)
#define task_pt_regs(tsk) \
(((struct pt_regs *)(THREAD_SIZE + task_stack_page(tsk))) - 1)
@ -160,10 +159,6 @@ unsigned long get_wchan(struct task_struct *p);
# define STACK_TOP TASK_SIZE
# define STACK_TOP_MAX STACK_TOP
void disable_hlt(void);
void enable_hlt(void);
void default_idle(void);
#ifdef CONFIG_DEBUG_FS
extern struct dentry *of_debugfs_root;
#endif

1
arch/microblaze/include/asm/thread_info.h
View File

@ -182,7 +182,6 @@ static inline bool test_and_clear_restore_sigmask(void)
ti->status &= ~TS_RESTORE_SIGMASK;
return true;
}
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif
#endif /* __KERNEL__ */

65
arch/microblaze/kernel/process.c
View File

@ -44,71 +44,6 @@ void show_regs(struct pt_regs *regs)
void (*pm_power_off)(void) = NULL;
EXPORT_SYMBOL(pm_power_off);
static int hlt_counter = 1;
void disable_hlt(void)
{
hlt_counter++;
}
EXPORT_SYMBOL(disable_hlt);
void enable_hlt(void)
{
hlt_counter--;
}
EXPORT_SYMBOL(enable_hlt);
static int __init nohlt_setup(char *__unused)
{
hlt_counter = 1;
return 1;
}
__setup("nohlt", nohlt_setup);
static int __init hlt_setup(char *__unused)
{
hlt_counter = 0;
return 1;
}
__setup("hlt", hlt_setup);
void default_idle(void)
{
if (likely(hlt_counter)) {
local_irq_disable();
stop_critical_timings();
cpu_relax();
start_critical_timings();
local_irq_enable();
} else {
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb__after_clear_bit();
local_irq_disable();
while (!need_resched())
cpu_sleep();
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
}
}
void cpu_idle(void)
{
set_thread_flag(TIF_POLLING_NRFLAG);
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched())
default_idle();
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
check_pgt_cache();
}
}
void flush_thread(void)
{
}

54
arch/mips/kernel/process.c
View File

@ -41,44 +41,26 @@
#include <asm/inst.h>
#include <asm/stacktrace.h>
/*
* The idle thread. There's no useful work to be done, so just try to conserve
* power and have a low exit latency (ie sit in a loop waiting for somebody to
* say that they'd like to reschedule)
*/
void __noreturn cpu_idle(void)
{
int cpu;
/* CPU is going idle. */
cpu = smp_processor_id();
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched() && cpu_online(cpu)) {
#ifdef CONFIG_MIPS_MT_SMTC
extern void smtc_idle_loop_hook(void);
smtc_idle_loop_hook();
#endif
if (cpu_wait) {
/* Don't trace irqs off for idle */
stop_critical_timings();
(*cpu_wait)();
start_critical_timings();
}
}
#ifdef CONFIG_HOTPLUG_CPU
if (!cpu_online(cpu) && !cpu_isset(cpu, cpu_callin_map))
play_dead();
void arch_cpu_idle_dead(void)
{
/* What the heck is this check doing ? */
if (!cpu_isset(smp_processor_id(), cpu_callin_map))
play_dead();
}
#endif
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
void arch_cpu_idle(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
extern void smtc_idle_loop_hook(void);
smtc_idle_loop_hook();
#endif
if (cpu_wait)
(*cpu_wait)();
else
local_irq_enable();
}
asmlinkage void ret_from_fork(void);

2
arch/mips/kernel/smp.c
View File

@ -139,7 +139,7 @@ asmlinkage __cpuinit void start_secondary(void)
WARN_ON_ONCE(!irqs_disabled());
mp_ops->smp_finish();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
/*

2
arch/mn10300/include/asm/thread_info.h
View File

@ -165,8 +165,6 @@ void arch_release_thread_info(struct thread_info *ti);
#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif /* __KERNEL__ */
#endif /* _ASM_THREAD_INFO_H */

70
arch/mn10300/kernel/process.c
View File

@ -50,77 +50,19 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
#if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU)
/*
* we use this if we don't have any better idle routine
*/
static void default_idle(void)
{
local_irq_disable();
if (!need_resched())
safe_halt();
else
local_irq_enable();
}
#else /* !CONFIG_SMP || CONFIG_HOTPLUG_CPU */
/*
* On SMP it's slightly faster (but much more power-consuming!)
* to poll the ->work.need_resched flag instead of waiting for the
* cross-CPU IPI to arrive. Use this option with caution.
*
* tglx: No idea why this depends on HOTPLUG_CPU !?!
*/
static inline void poll_idle(void)
#if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU)
void arch_cpu_idle(void)
{
int oldval;
local_irq_enable();
/*
* Deal with another CPU just having chosen a thread to
* run here:
*/
oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
if (!oldval) {
set_thread_flag(TIF_POLLING_NRFLAG);
while (!need_resched())
cpu_relax();
clear_thread_flag(TIF_POLLING_NRFLAG);
} else {
set_need_resched();
}
}
#endif /* !CONFIG_SMP || CONFIG_HOTPLUG_CPU */
/*
* the idle thread
* - there's no useful work to be done, so just try to conserve power and have
* a low exit latency (ie sit in a loop waiting for somebody to say that
* they'd like to reschedule)
*/
void cpu_idle(void)
{
/* endless idle loop with no priority at all */
for (;;) {
rcu_idle_enter();
while (!need_resched()) {
void (*idle)(void);
smp_rmb();
if (!idle) {
#if defined(CONFIG_SMP) && !defined(CONFIG_HOTPLUG_CPU)
idle = poll_idle;
#else /* CONFIG_SMP && !CONFIG_HOTPLUG_CPU */
idle = default_idle;
#endif /* CONFIG_SMP && !CONFIG_HOTPLUG_CPU */
}
idle();
}
rcu_idle_exit();
schedule_preempt_disabled();
}
safe_halt();
}
#endif
void release_segments(struct mm_struct *mm)
{

7
arch/mn10300/kernel/smp.c
View File

@ -675,7 +675,7 @@ int __init start_secondary(void *unused)
#ifdef CONFIG_GENERIC_CLOCKEVENTS
init_clockevents();
#endif
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
return 0;
}
@ -935,8 +935,6 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
int timeout;
#ifdef CONFIG_HOTPLUG_CPU
if (num_online_cpus() == 1)
disable_hlt();
if (sleep_mode[cpu])
run_wakeup_cpu(cpu);
#endif /* CONFIG_HOTPLUG_CPU */
@ -1003,9 +1001,6 @@ int __cpu_disable(void)
void __cpu_die(unsigned int cpu)
{
run_sleep_cpu(cpu);
if (num_online_cpus() == 1)
enable_hlt();
}
#ifdef CONFIG_MN10300_CACHE_ENABLED

2
arch/openrisc/include/asm/thread_info.h
View File

@ -128,8 +128,6 @@ register struct thread_info *current_thread_info_reg asm("r10");
/* For OpenRISC, this is anything in the LSW other than syscall trace */
#define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif /* __KERNEL__ */
#endif /* _ASM_THREAD_INFO_H */

2
arch/openrisc/kernel/Makefile
View File

@ -4,7 +4,7 @@
extra-y := head.o vmlinux.lds
obj-y := setup.o idle.o or32_ksyms.o process.o dma.o \
obj-y := setup.o or32_ksyms.o process.o dma.o \
traps.o time.o irq.o entry.o ptrace.o signal.o \
sys_call_table.o

73
arch/openrisc/kernel/idle.c
View File

@ -1,73 +0,0 @@
/*
* OpenRISC idle.c
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* Modifications for the OpenRISC architecture:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Idle daemon for or32. Idle daemon will handle any action
* that needs to be taken when the system becomes idle.
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/tick.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/cache.h>
#include <asm/pgalloc.h>
void (*powersave) (void) = NULL;
void cpu_idle(void)
{
set_thread_flag(TIF_POLLING_NRFLAG);
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched()) {
check_pgt_cache();
rmb();
clear_thread_flag(TIF_POLLING_NRFLAG);
local_irq_disable();
/* Don't trace irqs off for idle */
stop_critical_timings();
if (!need_resched() && powersave != NULL)
powersave();
start_critical_timings();
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
}
rcu_idle_exit();
tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
}
}

2
arch/parisc/include/asm/thread_info.h
View File

@ -77,8 +77,6 @@ struct thread_info {
#define _TIF_SYSCALL_TRACE_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
_TIF_BLOCKSTEP)
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif /* __KERNEL__ */
#endif /* _ASM_PARISC_THREAD_INFO_H */

22
arch/parisc/kernel/process.c
View File

@ -59,28 +59,6 @@
#include <asm/unwind.h>
#include <asm/sections.h>
/*
* The idle thread. There's no useful work to be
* done, so just try to conserve power and have a
* low exit latency (ie sit in a loop waiting for
* somebody to say that they'd like to reschedule)
*/
void cpu_idle(void)
{
set_thread_flag(TIF_POLLING_NRFLAG);
/* endless idle loop with no priority at all */
while (1) {
rcu_idle_enter();
while (!need_resched())
barrier();
rcu_idle_exit();
schedule_preempt_disabled();
check_pgt_cache();
}
}
#define COMMAND_GLOBAL F_EXTEND(0xfffe0030)
#define CMD_RESET 5 /* reset any module */

2
arch/parisc/kernel/smp.c
View File

@ -329,7 +329,7 @@ void __init smp_callin(void)
local_irq_enable(); /* Interrupts have been off until now */
cpu_idle(); /* Wait for timer to schedule some work */
cpu_startup_entry(CPUHP_ONLINE);
/* NOTREACHED */
panic("smp_callin() AAAAaaaaahhhh....\n");

2
arch/powerpc/include/asm/thread_info.h
View File

@ -182,8 +182,6 @@ static inline bool test_thread_local_flags(unsigned int flags)
#define is_32bit_task() (1)
#endif
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif /* !__ASSEMBLY__ */
#endif /* __KERNEL__ */

87
arch/powerpc/kernel/idle.c
View File

@ -33,11 +33,6 @@
#include <asm/runlatch.h>
#include <asm/smp.h>
#ifdef CONFIG_HOTPLUG_CPU
#define cpu_should_die() cpu_is_offline(smp_processor_id())
#else
#define cpu_should_die() 0
#endif
unsigned long cpuidle_disable = IDLE_NO_OVERRIDE;
EXPORT_SYMBOL(cpuidle_disable);
@ -50,64 +45,38 @@ static int __init powersave_off(char *arg)
}
__setup("powersave=off", powersave_off);
/*
* The body of the idle task.
*/
void cpu_idle(void)
#ifdef CONFIG_HOTPLUG_CPU
void arch_cpu_idle_dead(void)
{
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
sched_preempt_enable_no_resched();
cpu_die();
}
#endif
while (!need_resched() && !cpu_should_die()) {
ppc64_runlatch_off();
void arch_cpu_idle(void)
{
ppc64_runlatch_off();
if (ppc_md.power_save) {
clear_thread_flag(TIF_POLLING_NRFLAG);
/*
* smp_mb is so clearing of TIF_POLLING_NRFLAG
* is ordered w.r.t. need_resched() test.
*/
smp_mb();
local_irq_disable();
/* Don't trace irqs off for idle */
stop_critical_timings();
/* check again after disabling irqs */
if (!need_resched() && !cpu_should_die())
ppc_md.power_save();
start_critical_timings();
/* Some power_save functions return with
* interrupts enabled, some don't.
*/
if (irqs_disabled())
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
} else {
/*
* Go into low thread priority and possibly
* low power mode.
*/
HMT_low();
HMT_very_low();
}
}
HMT_medium();
ppc64_runlatch_on();
rcu_idle_exit();
tick_nohz_idle_exit();
if (cpu_should_die()) {
sched_preempt_enable_no_resched();
cpu_die();
}
schedule_preempt_disabled();
if (ppc_md.power_save) {
ppc_md.power_save();
/*
* Some power_save functions return with
* interrupts enabled, some don't.
*/
if (irqs_disabled())
local_irq_enable();
} else {
local_irq_enable();
/*
* Go into low thread priority and possibly
* low power mode.
*/
HMT_low();
HMT_very_low();
}
HMT_medium();
ppc64_runlatch_on();
}
int powersave_nap;

2
arch/powerpc/kernel/smp.c
View File

@ -669,7 +669,7 @@ __cpuinit void start_secondary(void *unused)
local_irq_enable();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
BUG();
}

32
arch/s390/kernel/process.c
View File

@ -61,18 +61,8 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
return sf->gprs[8];
}
/*
* The idle loop on a S390...
*/
static void default_idle(void)
void arch_cpu_idle(void)
{
if (cpu_is_offline(smp_processor_id()))
cpu_die();
local_irq_disable();
if (need_resched()) {
local_irq_enable();
return;
}
local_mcck_disable();
if (test_thread_flag(TIF_MCCK_PENDING)) {
local_mcck_enable();
@ -83,19 +73,15 @@ static void default_idle(void)
vtime_stop_cpu();
}
void cpu_idle(void)
void arch_cpu_idle_exit(void)
{
for (;;) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched() && !test_thread_flag(TIF_MCCK_PENDING))
default_idle();
rcu_idle_exit();
tick_nohz_idle_exit();
if (test_thread_flag(TIF_MCCK_PENDING))
s390_handle_mcck();
schedule_preempt_disabled();
}
if (test_thread_flag(TIF_MCCK_PENDING))
s390_handle_mcck();
}
void arch_cpu_idle_dead(void)
{
cpu_die();
}
extern void __kprobes kernel_thread_starter(void);

3
arch/s390/kernel/smp.c
View File

@ -714,8 +714,7 @@ static void __cpuinit smp_start_secondary(void *cpuvoid)
set_cpu_online(smp_processor_id(), true);
inc_irq_stat(CPU_RST);
local_irq_enable();
/* cpu_idle will call schedule for us */
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
/* Upping and downing of CPUs */

5
arch/s390/kernel/vtime.c
View File

@ -158,8 +158,6 @@ void __kprobes vtime_stop_cpu(void)
unsigned long psw_mask;
trace_hardirqs_on();
/* Don't trace preempt off for idle. */
stop_critical_timings();
/* Wait for external, I/O or machine check interrupt. */
psw_mask = psw_kernel_bits | PSW_MASK_WAIT | PSW_MASK_DAT |
@ -169,9 +167,6 @@ void __kprobes vtime_stop_cpu(void)
/* Call the assembler magic in entry.S */
psw_idle(idle, psw_mask);
/* Reenable preemption tracer. */
start_critical_timings();
/* Account time spent with enabled wait psw loaded as idle time. */
idle->sequence++;
smp_wmb();

18
arch/score/kernel/process.c
View File

@ -41,24 +41,6 @@ void machine_halt(void) {}
/* If or when software machine-power-off is implemented, add code here. */
void machine_power_off(void) {}
/*
* The idle thread. There's no useful work to be
* done, so just try to conserve power and have a
* low exit latency (ie sit in a loop waiting for
* somebody to say that they'd like to reschedule)
*/
void __noreturn cpu_idle(void)
{
/* endless idle loop with no priority at all */
while (1) {
rcu_idle_enter();
while (!need_resched())
barrier();
rcu_idle_exit();
schedule_preempt_disabled();
}
}
void ret_from_fork(void);
void ret_from_kernel_thread(void);

4
arch/sh/Kconfig
View File

@ -33,6 +33,7 @@ config SUPERH
select GENERIC_ATOMIC64
select GENERIC_IRQ_SHOW
select GENERIC_SMP_IDLE_THREAD
select GENERIC_IDLE_POLL_SETUP
select GENERIC_CLOCKEVENTS
select GENERIC_CMOS_UPDATE if SH_SH03 || SH_DREAMCAST
select GENERIC_STRNCPY_FROM_USER
@ -148,9 +149,6 @@ config ARCH_HAS_ILOG2_U32
config ARCH_HAS_ILOG2_U64
def_bool n
config ARCH_HAS_DEFAULT_IDLE
def_bool y
config NO_IOPORT
def_bool !PCI
depends on !SH_CAYMAN && !SH_SH4202_MICRODEV && !SH_SHMIN && \

2
arch/sh/include/asm/thread_info.h
View File

@ -207,8 +207,6 @@ static inline bool test_and_clear_restore_sigmask(void)
return true;
}
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif /* !__ASSEMBLY__ */
#endif /* __KERNEL__ */

105
arch/sh/kernel/idle.c
View File

@ -24,98 +24,24 @@
static void (*sh_idle)(void);
static int hlt_counter;
static int __init nohlt_setup(char *__unused)
{
hlt_counter = 1;
return 1;
}
__setup("nohlt", nohlt_setup);
static int __init hlt_setup(char *__unused)
{
hlt_counter = 0;
return 1;
}
__setup("hlt", hlt_setup);
static inline int hlt_works(void)
{
return !hlt_counter;
}
/*
* On SMP it's slightly faster (but much more power-consuming!)
* to poll the ->work.need_resched flag instead of waiting for the
* cross-CPU IPI to arrive. Use this option with caution.
*/
static void poll_idle(void)
{
local_irq_enable();
while (!need_resched())
cpu_relax();
}
void default_idle(void)
{
if (hlt_works()) {
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb__after_clear_bit();
set_bl_bit();
if (!need_resched()) {
local_irq_enable();
cpu_sleep();
} else
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
clear_bl_bit();
} else
poll_idle();
set_bl_bit();
local_irq_enable();
/* Isn't this racy ? */
cpu_sleep();
clear_bl_bit();
}
/*
* The idle thread. There's no useful work to be done, so just try to conserve
* power and have a low exit latency (ie sit in a loop waiting for somebody to
* say that they'd like to reschedule)
*/
void cpu_idle(void)
void arch_cpu_idle_dead(void)
{
unsigned int cpu = smp_processor_id();
play_dead();
}
set_thread_flag(TIF_POLLING_NRFLAG);
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched()) {
check_pgt_cache();
rmb();
if (cpu_is_offline(cpu))
play_dead();
local_irq_disable();
/* Don't trace irqs off for idle */
stop_critical_timings();
if (cpuidle_idle_call())
sh_idle();
/*
* Sanity check to ensure that sh_idle() returns
* with IRQs enabled
*/
WARN_ON(irqs_disabled());
start_critical_timings();
}
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
void arch_cpu_idle(void)
{
if (cpuidle_idle_call())
sh_idle();
}
void __init select_idle_routine(void)
@ -123,13 +49,8 @@ void __init select_idle_routine(void)
/*
* If a platform has set its own idle routine, leave it alone.
*/
if (sh_idle)
return;
if (hlt_works())
if (!sh_idle)
sh_idle = default_idle;
else
sh_idle = poll_idle;
}
void stop_this_cpu(void *unused)

2
arch/sh/kernel/smp.c
View File

@ -203,7 +203,7 @@ asmlinkage void __cpuinit start_secondary(void)
set_cpu_online(cpu, true);
per_cpu(cpu_state, cpu) = CPU_ONLINE;
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
extern struct {

2
arch/sparc/include/asm/thread_info_32.h
View File

@ -132,8 +132,6 @@ register struct thread_info *current_thread_info_reg asm("g6");
#define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | \
_TIF_SIGPENDING)
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif /* __KERNEL__ */
#endif /* _ASM_THREAD_INFO_H */

2
arch/sparc/include/asm/thread_info_64.h
View File

@ -256,8 +256,6 @@ static inline bool test_and_clear_restore_sigmask(void)
return true;
}
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0)
#define test_thread_64bit_stack(__SP) \
((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \

3
arch/sparc/kernel/hvtramp.S
View File

@ -128,8 +128,7 @@ hv_cpu_startup:
call smp_callin
nop
call cpu_idle
mov 0, %o0
call cpu_panic
nop

21
arch/sparc/kernel/process_32.c
View File

@ -64,23 +64,12 @@ extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
struct task_struct *last_task_used_math = NULL;
struct thread_info *current_set[NR_CPUS];
/*
* the idle loop on a Sparc... ;)
*/
void cpu_idle(void)
/* Idle loop support. */
void arch_cpu_idle(void)
{
set_thread_flag(TIF_POLLING_NRFLAG);
/* endless idle loop with no priority at all */
for (;;) {
while (!need_resched()) {
if (sparc_idle)
(*sparc_idle)();
else
cpu_relax();
}
schedule_preempt_disabled();
}
if (sparc_idle)
(*sparc_idle)();
local_irq_enable();
}
/* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */

49
arch/sparc/kernel/process_64.c
View File

@ -52,20 +52,17 @@
#include "kstack.h"
static void sparc64_yield(int cpu)
/* Idle loop support on sparc64. */
void arch_cpu_idle(void)
{
if (tlb_type != hypervisor) {
touch_nmi_watchdog();
return;
}
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb__after_clear_bit();
while (!need_resched() && !cpu_is_offline(cpu)) {
} else {
unsigned long pstate;
/* Disable interrupts. */
/* The sun4v sleeping code requires that we have PSTATE.IE cleared over
* the cpu sleep hypervisor call.
*/
__asm__ __volatile__(
"rdpr %%pstate, %0\n\t"
"andn %0, %1, %0\n\t"
@ -73,7 +70,7 @@ static void sparc64_yield(int cpu)
: "=&r" (pstate)
: "i" (PSTATE_IE));
if (!need_resched() && !cpu_is_offline(cpu))
if (!need_resched() && !cpu_is_offline(smp_processor_id()))
sun4v_cpu_yield();
/* Re-enable interrupts. */
@ -84,36 +81,16 @@ static void sparc64_yield(int cpu)
: "=&r" (pstate)
: "i" (PSTATE_IE));
}
set_thread_flag(TIF_POLLING_NRFLAG);
local_irq_enable();
}
/* The idle loop on sparc64. */
void cpu_idle(void)
{
int cpu = smp_processor_id();
set_thread_flag(TIF_POLLING_NRFLAG);
while(1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched() && !cpu_is_offline(cpu))
sparc64_yield(cpu);
rcu_idle_exit();
tick_nohz_idle_exit();
#ifdef CONFIG_HOTPLUG_CPU
if (cpu_is_offline(cpu)) {
sched_preempt_enable_no_resched();
cpu_play_dead();
}
#endif
schedule_preempt_disabled();
}
void arch_cpu_idle_dead()
{
sched_preempt_enable_no_resched();
cpu_play_dead();
}
#endif
#ifdef CONFIG_COMPAT
static void show_regwindow32(struct pt_regs *regs)

2
arch/sparc/kernel/smp_32.c
View File

@ -369,7 +369,7 @@ void __cpuinit sparc_start_secondary(void *arg)
local_irq_enable();
wmb();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
/* We should never reach here! */
BUG();

2
arch/sparc/kernel/smp_64.c
View File

@ -127,6 +127,8 @@ void __cpuinit smp_callin(void)
/* idle thread is expected to have preempt disabled */
preempt_disable();
cpu_startup_entry(CPUHP_ONLINE);
}
void cpu_panic(void)

3
arch/sparc/kernel/trampoline_64.S
View File

@ -407,8 +407,7 @@ after_lock_tlb:
call smp_callin
nop
call cpu_idle
mov 0, %o0
call cpu_panic
nop
1: b,a,pt %xcc, 1b

2
arch/tile/include/asm/thread_info.h
View File

@ -153,8 +153,6 @@ extern void _cpu_idle(void);
#define TS_POLLING 0x0004 /* in idle loop but not sleeping */
#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal */
#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK 1
static inline void set_restore_sigmask(void)

65
arch/tile/kernel/process.c
View File

@ -40,13 +40,11 @@
#include <arch/abi.h>
#include <arch/sim_def.h>
/*
* Use the (x86) "idle=poll" option to prefer low latency when leaving the
* idle loop over low power while in the idle loop, e.g. if we have
* one thread per core and we want to get threads out of futex waits fast.
*/
static int no_idle_nap;
static int __init idle_setup(char *str)
{
if (!str)
@ -54,64 +52,19 @@ static int __init idle_setup(char *str)
if (!strcmp(str, "poll")) {
pr_info("using polling idle threads.\n");
no_idle_nap = 1;
} else if (!strcmp(str, "halt"))
no_idle_nap = 0;
else
return -1;
return 0;
cpu_idle_poll_ctrl(true);
return 0;
} else if (!strcmp(str, "halt")) {
return 0;
}
return -1;
}
early_param("idle", idle_setup);
/*
* The idle thread. There's no useful work to be
* done, so just try to conserve power and have a
* low exit latency (ie sit in a loop waiting for
* somebody to say that they'd like to reschedule)
*/
void cpu_idle(void)
void arch_cpu_idle(void)
{
int cpu = smp_processor_id();
current_thread_info()->status |= TS_POLLING;
if (no_idle_nap) {
while (1) {
while (!need_resched())
cpu_relax();
schedule();
}
}
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched()) {
if (cpu_is_offline(cpu))
BUG(); /* no HOTPLUG_CPU */
local_irq_disable();
__get_cpu_var(irq_stat).idle_timestamp = jiffies;
current_thread_info()->status &= ~TS_POLLING;
/*
* TS_POLLING-cleared state must be visible before we
* test NEED_RESCHED:
*/
smp_mb();
if (!need_resched())
_cpu_idle();
else
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
}
rcu_idle_exit();
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
__get_cpu_var(irq_stat).idle_timestamp = jiffies;
_cpu_idle();
}
/*

4
arch/tile/kernel/smpboot.c
View File

@ -207,9 +207,7 @@ void __cpuinit online_secondary(void)
/* Set up tile-timer clock-event device on this cpu */
setup_tile_timer();
preempt_enable();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle)

27
arch/um/kernel/process.c
View File

@ -210,33 +210,14 @@ void initial_thread_cb(void (*proc)(void *), void *arg)
kmalloc_ok = save_kmalloc_ok;
}
void default_idle(void)
void arch_cpu_idle(void)
{
unsigned long long nsecs;
while (1) {
/* endless idle loop with no priority at all */
/*
* although we are an idle CPU, we do not want to
* get into the scheduler unnecessarily.
*/
if (need_resched())
schedule();
tick_nohz_idle_enter();
rcu_idle_enter();
nsecs = disable_timer();
idle_sleep(nsecs);
rcu_idle_exit();
tick_nohz_idle_exit();
}
}
void cpu_idle(void)
{
cpu_tasks[current_thread_info()->cpu].pid = os_getpid();
default_idle();
nsecs = disable_timer();
idle_sleep(nsecs);
local_irq_enable();
}
int __cant_sleep(void) {

21
arch/unicore32/kernel/process.c
View File

@ -45,25 +45,10 @@ static const char * const processor_modes[] = {
"UK18", "UK19", "UK1A", "EXTN", "UK1C", "UK1D", "UK1E", "SUSR"
};
void cpu_idle(void)
void arch_cpu_idle(void)
{
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
while (!need_resched()) {
local_irq_disable();
stop_critical_timings();
cpu_do_idle();
local_irq_enable();
start_critical_timings();
}
rcu_idle_exit();
tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
}
cpu_do_idle();
local_irq_enable();
}
static char reboot_mode = 'h';

3
arch/x86/Kconfig
View File

@ -188,9 +188,6 @@ config GENERIC_CALIBRATE_DELAY
config ARCH_HAS_CPU_RELAX
def_bool y
config ARCH_HAS_DEFAULT_IDLE
def_bool y
config ARCH_HAS_CACHE_LINE_SIZE
def_bool y

2
arch/x86/include/asm/thread_info.h
View File

@ -241,8 +241,6 @@ static inline struct thread_info *current_thread_info(void)
skip sending interrupt */
#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */
#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK 1
static inline void set_restore_sigmask(void)

107
arch/x86/kernel/process.c
View File

@ -301,13 +301,7 @@ void exit_idle(void)
}
#endif
/*
* The idle thread. There's no useful work to be
* done, so just try to conserve power and have a
* low exit latency (ie sit in a loop waiting for
* somebody to say that they'd like to reschedule)
*/
void cpu_idle(void)
void arch_cpu_idle_prepare(void)
{
/*
* If we're the non-boot CPU, nothing set the stack canary up
@ -317,71 +311,40 @@ void cpu_idle(void)
* canaries already on the stack wont ever trigger).
*/
boot_init_stack_canary();
current_thread_info()->status |= TS_POLLING;
}
while (1) {
tick_nohz_idle_enter();
void arch_cpu_idle_enter(void)
{
local_touch_nmi();
enter_idle();
}
while (!need_resched()) {
rmb();
void arch_cpu_idle_exit(void)
{
__exit_idle();
}
if (cpu_is_offline(smp_processor_id()))
play_dead();
/*
* Idle routines should keep interrupts disabled
* from here on, until they go to idle.
* Otherwise, idle callbacks can misfire.
*/
local_touch_nmi();
local_irq_disable();
enter_idle();
/* Don't trace irqs off for idle */
stop_critical_timings();
/* enter_idle() needs rcu for notifiers */
rcu_idle_enter();
if (cpuidle_idle_call())
x86_idle();
rcu_idle_exit();
start_critical_timings();
/* In many cases the interrupt that ended idle
has already called exit_idle. But some idle
loops can be woken up without interrupt. */
__exit_idle();
}
tick_nohz_idle_exit();
preempt_enable_no_resched();
schedule();
preempt_disable();
}
void arch_cpu_idle_dead(void)
{
play_dead();
}
/*
* We use this if we don't have any better
* idle routine..
* Called from the generic idle code.
*/
void arch_cpu_idle(void)
{
if (cpuidle_idle_call())
x86_idle();
}
/*
* We use this if we don't have any better idle routine..
*/
void default_idle(void)
{
trace_cpu_idle_rcuidle(1, smp_processor_id());
current_thread_info()->status &= ~TS_POLLING;
/*
* TS_POLLING-cleared state must be visible before we
* test NEED_RESCHED:
*/
smp_mb();
if (!need_resched())
safe_halt(); /* enables interrupts racelessly */
else
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
safe_halt();
trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
}
#ifdef CONFIG_APM_MODULE
@ -411,20 +374,6 @@ void stop_this_cpu(void *dummy)
halt();
}
/*
* On SMP it's slightly faster (but much more power-consuming!)
* to poll the ->work.need_resched flag instead of waiting for the
* cross-CPU IPI to arrive. Use this option with caution.
*/
static void poll_idle(void)
{
trace_cpu_idle_rcuidle(0, smp_processor_id());
local_irq_enable();
while (!need_resched())
cpu_relax();
trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
}
bool amd_e400_c1e_detected;
EXPORT_SYMBOL(amd_e400_c1e_detected);
@ -489,10 +438,10 @@ static void amd_e400_idle(void)
void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
{
#ifdef CONFIG_SMP
if (x86_idle == poll_idle && smp_num_siblings > 1)
if (boot_option_idle_override == IDLE_POLL && smp_num_siblings > 1)
pr_warn_once("WARNING: polling idle and HT enabled, performance may degrade\n");
#endif
if (x86_idle)
if (x86_idle || boot_option_idle_override == IDLE_POLL)
return;
if (cpu_has_amd_erratum(amd_erratum_400)) {
@ -517,8 +466,8 @@ static int __init idle_setup(char *str)
if (!strcmp(str, "poll")) {
pr_info("using polling idle threads\n");
x86_idle = poll_idle;
boot_option_idle_override = IDLE_POLL;
cpu_idle_poll_ctrl(true);
} else if (!strcmp(str, "halt")) {
/*
* When the boot option of idle=halt is added, halt is

2
arch/x86/kernel/smpboot.c
View File

@ -284,7 +284,7 @@ notrace static void __cpuinit start_secondary(void *unused)
x86_cpuinit.setup_percpu_clockev();
wmb();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
void __init smp_store_boot_cpu_info(void)

2
arch/x86/xen/smp.c
View File

@ -95,7 +95,7 @@ static void __cpuinit cpu_bringup(void)
static void __cpuinit cpu_bringup_and_idle(void)
{
cpu_bringup();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
static int xen_smp_intr_init(unsigned int cpu)

14
arch/xtensa/kernel/process.c
View File

@ -105,19 +105,9 @@ void coprocessor_flush_all(struct thread_info *ti)
/*
* Powermanagement idle function, if any is provided by the platform.
*/
void cpu_idle(void)
void arch_cpu_idle(void)
{
local_irq_enable();
/* endless idle loop with no priority at all */
while (1) {
rcu_idle_enter();
while (!need_resched())
platform_idle();
rcu_idle_exit();
schedule_preempt_disabled();
}
platform_idle();
}
/*

16
include/linux/cpu.h
View File

@ -212,4 +212,20 @@ static inline int disable_nonboot_cpus(void) { return 0; }
static inline void enable_nonboot_cpus(void) {}
#endif /* !CONFIG_PM_SLEEP_SMP */
enum cpuhp_state {
CPUHP_OFFLINE,
CPUHP_ONLINE,
};
void cpu_startup_entry(enum cpuhp_state state);
void cpu_idle(void);
void cpu_idle_poll_ctrl(bool enable);
void arch_cpu_idle(void);
void arch_cpu_idle_prepare(void);
void arch_cpu_idle_enter(void);
void arch_cpu_idle_exit(void);
void arch_cpu_idle_dead(void);
#endif /* _LINUX_CPU_H_ */

41
include/linux/sched.h
View File

@ -2456,6 +2456,47 @@ static inline int spin_needbreak(spinlock_t *lock)
#endif
}
/*
* Idle thread specific functions to determine the need_resched
* polling state. We have two versions, one based on TS_POLLING in
* thread_info.status and one based on TIF_POLLING_NRFLAG in
* thread_info.flags
*/
#ifdef TS_POLLING
static inline int tsk_is_polling(struct task_struct *p)
{
return task_thread_info(p)->status & TS_POLLING;
}
static inline void current_set_polling(void)
{
current_thread_info()->status |= TS_POLLING;
}
static inline void current_clr_polling(void)
{
current_thread_info()->status &= ~TS_POLLING;
smp_mb__after_clear_bit();
}
#elif defined(TIF_POLLING_NRFLAG)
static inline int tsk_is_polling(struct task_struct *p)
{
return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG);
}
static inline void current_set_polling(void)
{
set_thread_flag(TIF_POLLING_NRFLAG);
}
static inline void current_clr_polling(void)
{
clear_thread_flag(TIF_POLLING_NRFLAG);
}
#else
static inline int tsk_is_polling(struct task_struct *p) { return 0; }
static inline void current_set_polling(void) { }
static inline void current_clr_polling(void) { }
#endif
/*
* Thread group CPU time accounting.
*/

2
init/main.c
View File

@ -386,7 +386,7 @@ static noinline void __init_refok rest_init(void)
init_idle_bootup_task(current);
schedule_preempt_disabled();
/* Call into cpu_idle with preempt disabled */
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
}
/* Check for early params. */

1
kernel/Makefile
View File

@ -24,6 +24,7 @@ endif
obj-y += sched/
obj-y += power/
obj-y += cpu/
obj-$(CONFIG_CHECKPOINT_RESTORE) += kcmp.o
obj-$(CONFIG_FREEZER) += freezer.o

1
kernel/cpu/Makefile Normal file
View File

@ -0,0 +1 @@
obj-y = idle.o

107
kernel/cpu/idle.c Normal file
View File

@ -0,0 +1,107 @@
/*
* Generic entry point for the idle threads
*/
#include <linux/sched.h>
#include <linux/cpu.h>
#include <linux/tick.h>
#include <linux/mm.h>
#include <asm/tlb.h>
#include <trace/events/power.h>
static int __read_mostly cpu_idle_force_poll;
void cpu_idle_poll_ctrl(bool enable)
{
if (enable) {
cpu_idle_force_poll++;
} else {
cpu_idle_force_poll--;
WARN_ON_ONCE(cpu_idle_force_poll < 0);
}
}
#ifdef CONFIG_GENERIC_IDLE_POLL_SETUP
static int __init cpu_idle_poll_setup(char *__unused)
{
cpu_idle_force_poll = 1;
return 1;
}
__setup("nohlt", cpu_idle_poll_setup);
static int __init cpu_idle_nopoll_setup(char *__unused)
{
cpu_idle_force_poll = 0;
return 1;
}
__setup("hlt", cpu_idle_nopoll_setup);
#endif
static inline int cpu_idle_poll(void)
{
trace_cpu_idle_rcuidle(0, smp_processor_id());
local_irq_enable();
while (!need_resched())
cpu_relax();
trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
return 1;
}
/* Weak implementations for optional arch specific functions */
void __weak arch_cpu_idle_prepare(void) { }
void __weak arch_cpu_idle_enter(void) { }
void __weak arch_cpu_idle_exit(void) { }
void __weak arch_cpu_idle_dead(void) { }
void __weak arch_cpu_idle(void)
{
cpu_idle_force_poll = 1;
}
/*
* Generic idle loop implementation
*/
static void cpu_idle_loop(void)
{
while (1) {
tick_nohz_idle_enter();
while (!need_resched()) {
check_pgt_cache();
rmb();
if (cpu_is_offline(smp_processor_id()))
arch_cpu_idle_dead();
local_irq_disable();
arch_cpu_idle_enter();
if (cpu_idle_force_poll) {
cpu_idle_poll();
} else {
current_clr_polling();
if (!need_resched()) {
stop_critical_timings();
rcu_idle_enter();
arch_cpu_idle();
WARN_ON_ONCE(irqs_disabled());
rcu_idle_exit();
start_critical_timings();
} else {
local_irq_enable();
}
current_set_polling();
}
arch_cpu_idle_exit();
}
tick_nohz_idle_exit();
schedule_preempt_disabled();
}
}
void cpu_startup_entry(enum cpuhp_state state)
{
current_set_polling();
arch_cpu_idle_prepare();
cpu_idle_loop();
}

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