Messages in this thread | | | Date | Sat, 12 May 2007 03:20:24 +0400 | From | Oleg Nesterov <> | Subject | Re: [PATCH 1/7] Freezer: Read PF_BORROWED_MM in a nonracy way |
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On 05/11, Linus Torvalds wrote: > > On Fri, 11 May 2007, Rafael J. Wysocki wrote: > > > > Therefore, by taking the task_lock() here we make sure that the condition > > is alyways false when we check it for kernel threads. > > Why *test* it then and return anything? > > Why not just doa "task_lock(p); task_unlock(p);" with no return value?
because we should not freeze a kernel thread at FREEZER_USER_SPACE stage?
without task_lock() we can see "p->mm != NULL" but not PF_BORROWED_MM.
Oleg.
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