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Date:   Wed, 6 Mar 2019 09:59:11 -0800
From:   Linus Torvalds <>
To:     Peter Zijlstra <>
Cc:     Dmitry Vyukov <>,
        Thomas Gleixner <>,
        "H. Peter Anvin" <>,
        Julien Thierry <>,
        Will Deacon <>,
        Andy Lutomirski <>,
        Ingo Molnar <>,
        Catalin Marinas <>,
        James Morse <>,,
        Brian Gerst <>,
        Josh Poimboeuf <>,
        Andy Lutomirski <>,
        Borislav Petkov <>,
        Denys Vlasenko <>,
        LKML <>,
        Andrey Ryabinin <>,
        Juergen Gross <>
Subject: Re: [PATCH 1/8] kasan,x86: Frob kasan_report() in an exception

On Wed, Mar 6, 2019 at 9:37 AM Peter Zijlstra <> wrote:
> The below seems to 'work'.

Yeah, and makes things cheaper for the non-SMAP case too. Looks sane.

One note:

 +       asm volatile (ALTERNATIVE("", "pushf; pop %0; "

Hmm. Every single use of __ASM_CLAC is together with "__stringity()".

Maybe we could just get rid of that oddity, and just make __ASM_CLAC
be a string to begin with.

At one point it was used bare in the __ASSEMBLY__ version, but that
does not appear to the case any more since commit 669f8a900198
("x86/smap: Use ALTERNATIVE macro") back in 2015.


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