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Date:   Sat, 2 Sep 2017 12:32:21 +0200
From:   Ingo Molnar <>
To:     Josh Poimboeuf <>
Cc:     Linus Torvalds <>,
        the arch/x86 maintainers <>,
        Linux Kernel Mailing List <>,
        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

* Josh Poimboeuf <> wrote:

> 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.

Please do statistics of how many functions are affected, on a defconfig-ish 



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