diff options
| author | Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-05-31 16:26:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-31 17:49:29 -0700 |
| commit | 3eaa73bde2fb475b731a0fde7dd11c3ecfb8679c (patch) | |
| tree | 23c087b9be927d334c3eb3b08f746a8675dae3b9 /arch | |
| parent | cb79295e20a8088a2fd6a9b3cb5f2d889ec36b4d (diff) | |
arm: use clear_tasks_mm_cpumask()
Checking for process->mm is not enough because process' main thread may
exit or detach its mm via use_mm(), but other threads may still have a
valid mm.
To fix this we would need to use find_lock_task_mm(), which would walk up
all threads and returns an appropriate task (with task lock held).
clear_tasks_mm_cpumask() has this issue fixed, so let's use it.
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kernel/smp.c | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index b735521a4a54..2c7217d971db 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -109,7 +109,6 @@ static void percpu_timer_stop(void); int __cpu_disable(void) { unsigned int cpu = smp_processor_id(); - struct task_struct *p; int ret; ret = platform_cpu_disable(cpu); @@ -139,12 +138,7 @@ int __cpu_disable(void) flush_cache_all(); local_flush_tlb_all(); - read_lock(&tasklist_lock); - for_each_process(p) { - if (p->mm) - cpumask_clear_cpu(cpu, mm_cpumask(p->mm)); - } - read_unlock(&tasklist_lock); + clear_tasks_mm_cpumask(cpu); return 0; } |