Re: linux/kernel/sched.c: context_switch().

[chxanders@xxxxxxxxx]

Long day? Do you mean likely(!mm) actually means unlikely(0)?


On 8 September 2010 20:08, fabio de francesco <fabio@xxxxxxxxxxx> 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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