Re: [PATCH v2 0/4] fix several TLB batch races

From: Andrew Morton
Date: Tue Aug 01 2017 - 18:29:48 EST

On Tue, 1 Aug 2017 14:56:13 +0900 Minchan Kim <minchan@xxxxxxxxxx> wrote:

> Nadav and Mel founded several subtle races caused by TLB batching.
> This patchset aims for solving thoses problems using embedding
> [inc|dec]_tlb_flush_pending to TLB batching API.
> With that, places to know TLB flush pending catch it up by
> using mm_tlb_flush_pending.
> Each patch includes detailed description.
> This patchset is based on v4.13-rc2-mmots-2017-07-28-16-10 +
> "[PATCH v5 0/3] mm: fixes of tlb_flush_pending races" from Nadav

Nadav is planning on doing a v4 of his patchset and it sounds like it
will be significantly different.

So I'll await that patch series. Nadav, I think it would be best if
you were to integrate Minchan's patchset on top of yours and maintain the
whole set as a single series, please. That way it all gets tested at
the same time and you're testing the hopefully-final result. If that's
OK then please retain the various acks and reviewed-bys in the

And we'll need to figure out which kernel versions to fix. Let's
target 4.13-rcX for now, and assess the feasibility and desirability of
backporting it all into -stable.