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Date: Tue, 11 Nov 2014 16:36:06 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Christian Borntraeger <borntraeger@...ibm.com> Cc: Paul McKenney <paulmck@...ux.vnet.ibm.com>, Ingo Molnar <mingo@...nel.org>, Paolo Bonzini <pbonzini@...hat.com>, KVM <kvm@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Heiko Carstens <heiko.carstens@...ibm.com>, Andreas Krebbel <Andreas.Krebbel@...ibm.com>, Martin Schwidefsky <schwidefsky@...ibm.com>, Cornelia Huck <cornelia.huck@...ibm.com>, "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org> Subject: Re: compiler bug gcc4.6/4.7 with ACCESS_ONCE and workarounds On Tue, Nov 11, 2014 at 4:33 PM, Linus Torvalds <torvalds@...ux-foundation.org> wrote: > > I guess as a workaround it is fine, as long as we don't lose sight of > trying to eventually do a better job. Oh, and when it comes to the actual gcc bug - do you have any reason to believe that it's somehow triggered more easily by something particular in the arch/s390/kvm/gaccess.c code? IOW, why does this problem not hit the x86 spinlocks that also use volatile pointers to aggregate types? Or does it? Linus -- 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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