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Date:   Thu, 31 Aug 2017 12:31:32 -0500
From:   Josh Poimboeuf <>
To:     Linus Torvalds <>
Cc:     the arch/x86 maintainers <>,
        Linux Kernel Mailing List <>,
        Ingo Molnar <>,
        Thomas Gleixner <>,
        "H. Peter Anvin" <>,
        Andy Lutomirski <>,
        Alexander Potapenko <>,
        Dmitriy Vyukov <>,
        Matthias Kaehlcke <>,
        Arnd Bergmann <>,
        Peter Zijlstra <>
Subject: Re: [RFC PATCH 3/4] x86/asm: Make alternative macro interfaces more
 clear and consistent

On Thu, Aug 31, 2017 at 12:25:42PM -0500, Josh Poimboeuf wrote:
> 2) Put "sp" in the clobbers list instead of as an i/o constraint.  This
>    mostly works for GCC, and doesn't break clang.  However, it causes
>    GCC to insert a "lea -0x10(%rbp),%rsp" in the epilogue of every
>    affected function.

And maybe this extra instruction is negligible for performance and not a
big deal?  I might look at this one after the holiday too.


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