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

Pull timer fixes from Thomas Gleixner:

 - Cure for not using zalloc in the first place, which leads to random
   crashes with CPUMASK_OFF_STACK.

 - Revert a user space visible change which broke udev

 - Add a missing cpu_online early return introduced by the new full
   dyntick conversions

 - Plug a long standing race in the timer wheel cpu hotplug code.
   Sigh...

 - Cleanup NOHZ per cpu data on cpu down to prevent stale data on cpu
   up.

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  time: Revert ALWAYS_USE_PERSISTENT_CLOCK compile time optimizaitons
  timer: Don't reinitialize the cpu base lock during CPU_UP_PREPARE
  tick: Don't invoke tick_nohz_stop_sched_tick() if the cpu is offline
  tick: Cleanup NOHZ per cpu data on cpu down
  tick: Use zalloc_cpumask_var for allocating offstack cpumasks
This commit is contained in:
Linus Torvalds 2013-05-15 14:05:17 -07:00
parent 37cae5e249 b4f711ee03
commit cc51bf6e6d
7 changed files with 8 additions and 19 deletions
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1
arch/x86/Kconfig
View File

@ -108,7 +108,6 @@ config X86
select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
select GENERIC_TIME_VSYSCALL if X86_64
select KTIME_SCALAR if X86_32
select ALWAYS_USE_PERSISTENT_CLOCK
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HAVE_CONTEXT_TRACKING if X86_64

2
drivers/rtc/Kconfig
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@ -20,7 +20,6 @@ if RTC_CLASS
config RTC_HCTOSYS
bool "Set system time from RTC on startup and resume"
default y
depends on !ALWAYS_USE_PERSISTENT_CLOCK
help
If you say yes here, the system time (wall clock) will be set using
the value read from a specified RTC device. This is useful to avoid
@ -29,7 +28,6 @@ config RTC_HCTOSYS
config RTC_SYSTOHC
bool "Set the RTC time based on NTP synchronization"
default y
depends on !ALWAYS_USE_PERSISTENT_CLOCK
help
If you say yes here, the system time (wall clock) will be stored
in the RTC specified by RTC_HCTOSYS_DEVICE approximately every 11

4
include/linux/time.h
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@ -117,14 +117,10 @@ static inline bool timespec_valid_strict(const struct timespec *ts)
extern bool persistent_clock_exist;
#ifdef ALWAYS_USE_PERSISTENT_CLOCK
#define has_persistent_clock() true
#else
static inline bool has_persistent_clock(void)
{
return persistent_clock_exist;
}
#endif
extern void read_persistent_clock(struct timespec *ts);
extern void read_boot_clock(struct timespec *ts);

5
kernel/time/Kconfig
View File

@ -12,11 +12,6 @@ config CLOCKSOURCE_WATCHDOG
config ARCH_CLOCKSOURCE_DATA
bool
# Platforms has a persistent clock
config ALWAYS_USE_PERSISTENT_CLOCK
bool
default n
# Timekeeping vsyscall support
config GENERIC_TIME_VSYSCALL
bool

10
kernel/time/tick-broadcast.c
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@ -786,11 +786,11 @@ bool tick_broadcast_oneshot_available(void)
void __init tick_broadcast_init(void)
{
alloc_cpumask_var(&tick_broadcast_mask, GFP_NOWAIT);
alloc_cpumask_var(&tmpmask, GFP_NOWAIT);
zalloc_cpumask_var(&tick_broadcast_mask, GFP_NOWAIT);
zalloc_cpumask_var(&tmpmask, GFP_NOWAIT);
#ifdef CONFIG_TICK_ONESHOT
alloc_cpumask_var(&tick_broadcast_oneshot_mask, GFP_NOWAIT);
alloc_cpumask_var(&tick_broadcast_pending_mask, GFP_NOWAIT);
alloc_cpumask_var(&tick_broadcast_force_mask, GFP_NOWAIT);
zalloc_cpumask_var(&tick_broadcast_oneshot_mask, GFP_NOWAIT);
zalloc_cpumask_var(&tick_broadcast_pending_mask, GFP_NOWAIT);
zalloc_cpumask_var(&tick_broadcast_force_mask, GFP_NOWAIT);
#endif
}

3
kernel/time/tick-sched.c
View File

@ -717,6 +717,7 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
if (unlikely(!cpu_online(cpu))) {
if (cpu == tick_do_timer_cpu)
tick_do_timer_cpu = TICK_DO_TIMER_NONE;
return false;
}
if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE))
@ -1168,7 +1169,7 @@ void tick_cancel_sched_timer(int cpu)
hrtimer_cancel(&ts->sched_timer);
# endif
ts->nohz_mode = NOHZ_MODE_INACTIVE;
memset(ts, 0, sizeof(*ts));
}
#endif

2
kernel/timer.c
View File

@ -1539,12 +1539,12 @@ static int __cpuinit init_timers_cpu(int cpu)
boot_done = 1;
base = &boot_tvec_bases;
}
spin_lock_init(&base->lock);
tvec_base_done[cpu] = 1;
} else {
base = per_cpu(tvec_bases, cpu);
}
spin_lock_init(&base->lock);
for (j = 0; j < TVN_SIZE; j++) {
INIT_LIST_HEAD(base->tv5.vec + j);