Re: async_pf.c && use_mm() (Was: mm,vmacache: also flush cache for VM_CLONE)

[Linus Torvalds]

On Thu, Mar 13, 2014 at 12:14 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> Maybe it uses use_mm just to increment the usage count. Which is bogus, and
> it should just "get" it instead, but whatever.
>
> On my phone, so I can't check the details.

Ok, no longer on my phone, and no, it clearly does the reference count with a

    atomic_inc(&work->mm->mm_count);

separately. The use_mm/unuse_mm seems entirely specious.

Maybe it has some historical meaning to it.

               Linus
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