Re: [PATCH] arch, mm: introduce arch_tlb_gather_mmu_lazy (was: Re: [RESEND PATCH] mm, oom_reaper: gather each vma to prevent) leaking TLB entry

Michal Hocko
2017-11-15T08:14:58Z

On Mon 13-11-17 09:28:33, Minchan Kim wrote:
[...]
> void arch_tlb_gather_mmu(...)
>
> tlb->fullmm = !(start | (end + 1)) && atomic_read(&mm->mm_users) == 0;

Sorry, I should have realized sooner but this will not work for the oom
reaper. It _can_ race with the final exit_mmap and run with mm_users == 0
--
Michal Hocko
SUSE Labs