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android_kernel_google_msm/arch/avr32/kernel
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Frederic Weisbecker 2bbb6817c0 nohz: Allow rcu extended quiescent state handling seperately from tick stop 
It is assumed that rcu won't be used once we switch to tickless
mode and until we restart the tick. However this is not always
true, as in x86-64 where we dereference the idle notifiers after
the tick is stopped.

To prepare for fixing this, add two new APIs:
tick_nohz_idle_enter_norcu() and tick_nohz_idle_exit_norcu().

If no use of RCU is made in the idle loop between
tick_nohz_enter_idle() and tick_nohz_exit_idle() calls, the arch
must instead call the new *_norcu() version such that the arch doesn't
need to call rcu_idle_enter() and rcu_idle_exit().

Otherwise the arch must call tick_nohz_enter_idle() and
tick_nohz_exit_idle() and also call explicitly:

- rcu_idle_enter() after its last use of RCU before the CPU is put
to sleep.
- rcu_idle_exit() before the first use of RCU after the CPU is woken
up.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: David Miller <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2011-12-11 10:31:36 -08:00
..
.gitignore avr32: add .gitignore files 2008-09-19 18:21:29 +02:00
asm-offsets.c avr32: Fix lockup after Java stack underflow in user mode 2008-09-01 13:04:04 +02:00
avr32_ksyms.c asm-generic: rename generic little-endian bitops functions 2011-03-23 19:46:11 -07:00
cpu.c sysdev: Pass the attribute to the low level sysdev show/store function 2008-07-21 21:55:02 -07:00
entry-avr32b.S KEYS: Extend TIF_NOTIFY_RESUME to (almost) all architectures [try #6] 2009-09-02 21:29:19 +10:00
head.S
init_task.c Use new __init_task_data macro in arch init_task.c files. 2009-09-21 06:27:08 +02:00
irq.c avr32: Use generic show_interrupts() 2011-03-24 20:35:56 +01:00
kprobes.c
Makefile
module.c modules: make arch's use default loader hooks 2011-07-24 22:06:04 +09:30
nmi_debug.c
ocd.c
process.c nohz: Allow rcu extended quiescent state handling seperately from tick stop 2011-12-11 10:31:36 -08:00
ptrace.c ptrace: cleanup arch_ptrace() on avr32 2010-10-27 18:03:10 -07:00
setup.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
signal.c KEYS: Add missing linux/tracehook.h #inclusions 2009-09-09 18:30:02 +10:00
stacktrace.c fix core/stacktrace changes on avr32, mips, sh 2008-07-18 14:42:35 +02:00
switch_to.S
sys_avr32.c Make do_execve() take a const filename pointer 2010-08-17 18:07:43 -07:00
syscall-stubs.S Unify sys_mmap* 2009-12-11 06:44:29 -05:00
syscall_table.S All Arch: remove linkage for sys_nfsservctl system call 2011-08-26 15:09:58 -07:00
time.c avr32: Convert to clocksource_register_hz 2011-01-13 20:41:11 +01:00
traps.c avr32: init cannot ignore signals sent by force_sig_info() 2011-04-13 15:46:55 +02:00
vmlinux.lds.S avr32: clean up linker script using standard macros. 2009-10-06 17:39:22 +02:00