linux-kernel - Re: linux/kernel/sched.c: context

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Message-ID: <AANLkTik7sSbiPBM8Sdo2R3=NwLN4oJr3Q7MSNp+Y4jo3@mail.gmail.com>
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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