Commit 1198c8b9 authored by Anton Vorontsov's avatar Anton Vorontsov Committed by Linus Torvalds

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: default avatarOleg Nesterov <oleg@redhat.com>
Signed-off-by: default avatarAnton Vorontsov <anton.vorontsov@linaro.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 73863ab0
...@@ -123,7 +123,6 @@ void native_play_dead(void) ...@@ -123,7 +123,6 @@ void native_play_dead(void)
int __cpu_disable(void) int __cpu_disable(void)
{ {
unsigned int cpu = smp_processor_id(); unsigned int cpu = smp_processor_id();
struct task_struct *p;
int ret; int ret;
ret = mp_ops->cpu_disable(cpu); ret = mp_ops->cpu_disable(cpu);
...@@ -153,11 +152,7 @@ int __cpu_disable(void) ...@@ -153,11 +152,7 @@ int __cpu_disable(void)
flush_cache_all(); flush_cache_all();
local_flush_tlb_all(); local_flush_tlb_all();
read_lock(&tasklist_lock); clear_tasks_mm_cpumask(cpu);
for_each_process(p)
if (p->mm)
cpumask_clear_cpu(cpu, mm_cpumask(p->mm));
read_unlock(&tasklist_lock);
return 0; return 0;
} }
......
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