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Groups > linux.kernel > #1455526
| From | Rafael Aquini <aquini@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH] x86/mm: Add barriers and document switch_mm()-vs-flush synchronization follow-up |
| Date | 2016-08-03 01:20 +0200 |
| Message-ID | <s1R8B-2L9-3@gated-at.bofh.it> (permalink) |
| References | <s1K79-6pf-41@gated-at.bofh.it> <s1Qmd-2er-11@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue, Aug 02, 2016 at 03:27:06PM -0700, Nadav Amit wrote:
> Rafael Aquini <aquini@redhat.com> wrote:
>
> > While backporting 71b3c126e611 ("x86/mm: Add barriers and document switch_mm()-vs-flush synchronization")
> > we stumbled across a possibly missing barrier at flush_tlb_page().
>
> I too noticed it and submitted a similar patch that never got a response [1].
>
As far as I understood Andy's rationale for the original patch you need
a full memory barrier there in flush_tlb_page to get that cache-eviction
race sorted out.
Regards,
-- Rafael
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[PATCH] x86/mm: Add barriers and document switch_mm()-vs-flush synchronization follow-up Rafael Aquini <aquini@redhat.com> - 2016-08-02 17:50 +0200
Re: [PATCH] x86/mm: Add barriers and document switch_mm()-vs-flush synchronization follow-up Nadav Amit <nadav.amit@gmail.com> - 2016-08-03 00:30 +0200
Re: [PATCH] x86/mm: Add barriers and document switch_mm()-vs-flush synchronization follow-up Andy Lutomirski <luto@amacapital.net> - 2016-08-03 00:50 +0200
Re: [PATCH] x86/mm: Add barriers and document switch_mm()-vs-flush synchronization follow-up Rafael Aquini <aquini@redhat.com> - 2016-08-03 01:20 +0200
Re: [PATCH] x86/mm: Add barriers and document switch_mm()-vs-flush synchronization follow-up Nadav Amit <nadav.amit@gmail.com> - 2016-08-03 02:50 +0200
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