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Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb()

From "Michael S. Tsirkin" <mst@redhat.com>
Newsgroups linux.kernel
Subject Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb()
Date 2016-01-13 17:50 +0100
Message-ID <qQwMs-2sp-57@gated-at.bofh.it> (permalink)
References (5 earlier) <qQg4W-7wg-17@gated-at.bofh.it> <qQgxY-7W2-13@gated-at.bofh.it> <qQwjn-2ek-7@gated-at.bofh.it> <qQwt4-2jv-11@gated-at.bofh.it> <qQwCK-2o0-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Wed, Jan 13, 2016 at 05:33:31PM +0100, Borislav Petkov wrote:
> On Wed, Jan 13, 2016 at 06:25:21PM +0200, Michael S. Tsirkin wrote:
> > Which flag do you refer to, exactly?
> 
> All the flags in rFLAGS which ADD modifies: OF,SF,ZF,AF,PF,CF

Oh, I think this means we need a "cc" clobber.

This also seems to be a bug on !XMM CPUs.

cmpxchg.h gets it right.

I'll send a patch.

> -- 
> Regards/Gruss,
>     Boris.
> 
> ECO tip #101: Trim your mails when you reply.

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Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-12 15:00 +0100
  Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-12 18:30 +0100
    Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-12 18:50 +0100
      Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-12 19:10 +0100
    Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() Andy Lutomirski <luto@kernel.org> - 2016-01-12 21:40 +0100
      Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-12 22:00 +0100
        Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() Andy Lutomirski <luto@amacapital.net> - 2016-01-12 22:10 +0100
          Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-12 22:40 +0100
            Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-12 23:20 +0100
            Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-13 17:30 +0100
          Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-12 23:30 +0100
            Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() "H. Peter Anvin" <hpa@zytor.com> - 2016-01-13 00:00 +0100
              Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-13 00:30 +0100
                Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() Borislav Petkov <bp@alien8.de> - 2016-01-13 17:20 +0100
                Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-13 17:30 +0100
                Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() Borislav Petkov <bp@alien8.de> - 2016-01-13 17:40 +0100
                Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-13 17:50 +0100
                Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() Borislav Petkov <bp@alien8.de> - 2016-01-13 18:00 +0100
                Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() "Michael S. Tsirkin" <mst@redhat.com> - 2016-01-13 18:10 +0100
                Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb() Linus Torvalds <torvalds@linux-foundation.org> - 2016-01-13 19:40 +0100

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