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Date:   Wed, 27 Feb 2019 18:34:22 +0100
From:   Peter Zijlstra <>
To:     Linus Torvalds <>
Cc:     Ingo Molnar <>, Borislav Petkov <>,
        Thomas Gleixner <>,
        Andrew Lutomirski <>,
        Nadav Amit <>,
        Linux List Kernel Mailing <>,
        Nadav Amit <>
Subject: Re: [PATCH 1/5] x86/percpu: Differentiate this_cpu_{}() and

On Wed, Feb 27, 2019 at 09:17:42AM -0800, Linus Torvalds wrote:
> It all seems pretty ad-hoc, and we already _know_ that "asm volatile" is bad.

Ah, all I wanted was the ONCE thing and my inline asm foo sucks. If +m
gets us that, awesome.

But the ONCE thing defeats CSE (on purpose!) so for code-gen that
likes/wants that we then have to use the __this_cpu crud.

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