diff options
author | Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-06-01 01:26:23 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-06-01 02:49:30 +0200 |
commit | 1198c8b9af611bb697d92259095d7cc20f5c961d (patch) | |
tree | bfb72d1ba5f362aca38cf09857e3d9fcc05dd60a /arch/sh/kernel/smp.c | |
parent | powerpc: use clear_tasks_mm_cpumask() (diff) | |
download | linux-1198c8b9af611bb697d92259095d7cc20f5c961d.tar.xz linux-1198c8b9af611bb697d92259095d7cc20f5c961d.zip |
sh: 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 the issue fixed, so let's use it.
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sh/kernel/smp.c')
-rw-r--r-- | arch/sh/kernel/smp.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c index b86e9ca79455..2062aa88af41 100644 --- a/arch/sh/kernel/smp.c +++ b/arch/sh/kernel/smp.c @@ -123,7 +123,6 @@ void native_play_dead(void) int __cpu_disable(void) { unsigned int cpu = smp_processor_id(); - struct task_struct *p; int ret; ret = mp_ops->cpu_disable(cpu); @@ -153,11 +152,7 @@ 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; } |