Subject: [PATCH 09/10] um: Properly check all process' threads for a live mm

From: [email-masked] (Richard Weinberger)
Date: Sat, 24 Mar 2012 12:12:21 +0100

Am 24.03.2012 11:31, schrieb Anton Vorontsov:
> kill_off_processes() might miss a valid process, this is because
> checking for process->mm is not enough. Process' main thread may
> exit or detach its mm via use_mm(), but other threads may still
> have a valid mm.
> 
> To catch this we use find_lock_task_mm(), which walks up all
> threads and returns an appropriate task (with task lock held).
> 
> Suggested-by: Oleg Nesterov <[email-masked]>
> Signed-off-by: Anton Vorontsov <[email-masked]>

Acked-by: Richard Weinberger <[email-masked]>

Thanks,
//richard

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