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Date: Wed, 8 Sep 2010 20:10:49 +0700
From: "chxanders@...il.com" <chxanders@...il.com>
To: fabio de francesco <fabio@...anix.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: linux/kernel/sched.c: context_switch().
Long day? Do you mean likely(!mm) actually means unlikely(0)?
On 8 September 2010 20:08, fabio de francesco <fabio@...anix.org> wrote:
> There must be something I am missing in sched.c at context_switch() function
> definition.
>
> There I can read the following code:
>
> static inline void
> context_switch(struct rq *rq, struct task_struct *prev,
> struct task_struct *next)
> {
> ...
> struct mm_struct *mm;
> mm = next->mm;
> if (likely(!mm)) {
> next->active_mm = oldmm;
> atomic_inc(&oldmm->mm_count);
> enter_lazy_tlb(oldmm, next);
> } else
> switch_mm(oldmm, mm, next);
> ...
> }
>
> May someone please explain why the mm pointer is likely supposed to be NULL?
>
> Thanks in advance.
>
> fabio
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