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Message-ID: <CALCETrUgdUXEiwpa3W75o3ivamPXkZ=qjKuxPW2sSzxG_zhjFg@mail.gmail.com> Date: Wed, 1 Oct 2014 11:44:44 -0700 From: Andy Lutomirski <luto@...capital.net> To: "H. Peter Anvin" <hpa@...or.com> Cc: Thomas Gleixner <tglx@...utronix.de>, X86 ML <x86@...nel.org>, Ingo Molnar <mingo@...hat.com>, Sebastian Lackner <sebastian@...-team.de>, Anish Bhatt <anish@...lsio.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Chuck Ebbert <cebbert.lkml@...il.com> Subject: Re: [PATCH v3 2/2] x86_64: Don't save flags on context switch On Wed, Oct 1, 2014 at 11:35 AM, H. Peter Anvin <hpa@...or.com> wrote: > On 10/01/2014 11:28 AM, Andy Lutomirski wrote: >> >> #define __EXTRA_CLOBBER \ >> , "rcx", "rbx", "rdx", "r8", "r9", "r10", "r11", \ >> - "r12", "r13", "r14", "r15" >> + "r12", "r13", "r14", "r15", "flags" >> > > I was under the impression that gcc *always* assumes the flags were > clobbered for an asm statement. Otherwise I think we'd have a lot of > problems. > I have no idea, but I doubt that adding the explicit "flags" clobber hurts, and it will make other people who are unsure about this less worried. --Andy > -hpa > > -- Andy Lutomirski AMA Capital Management, LLC -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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