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Date:   Thu, 10 Dec 2020 16:11:36 -0800
From:   Andy Lutomirski <>
To:     Nicholas Piggin <>
Cc:     Andy Lutomirski <>,
        Anton Blanchard <>,
        Arnd Bergmann <>,
        linux-arch <>,
        LKML <>,
        Linux-MM <>,
        linuxppc-dev <>,
        Mathieu Desnoyers <>,
        Peter Zijlstra <>, X86 ML <>
Subject: Re: [PATCH 2/8] x86: use exit_lazy_tlb rather than membarrier_mm_sync_core_before_usermode

> On Dec 5, 2020, at 7:59 PM, Nicholas Piggin <> wrote:

> I'm still going to persue shoot-lazies for the merge window. As you
> see it's about a dozen lines and a if (IS_ENABLED(... in core code.
> Your change is common code, but a significant complexity (which
> affects all archs) so needs a lot more review and testing at this
> point.

I don't think it's ready for this merge window.  I read the early
patches again, and I think they make the membarrier code worse, not
better.  I'm not fundamentally opposed to the shoot-lazies concept,
but it needs more thought and it needs a cleaner foundation.

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