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sh: use clear_tasks_mm_cpumask()

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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>
This commit is contained in:
Anton Vorontsov 2012-05-31 16:26:23 -07:00 committed by Linus Torvalds
parent 73863ab028
commit 1198c8b9af
1 changed files with 1 additions and 6 deletions
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7
arch/sh/kernel/smp.c
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@ -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;
}