Revert x86, mem: Optimize memcpy by avoiding memory false dependece
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From: Mathieu Desnoyers on 8 Jul 2010 11:10 * Ingo Molnar (mingo(a)elte.hu) wrote: > > * Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com> wrote: > > > * Ma, Ling (ling.ma(a)intel.com) wrote: > > > Hi Mathieu > > > > > > I did git revert as bellow > > > Revert "x86, mem: Optimize memcpy by avoiding memory false dependece" > > > > > > This reverts commit 77ff5e49c20bb72a99a12bfb00dbf90b2302f087. > > > And I found the machine will crash with your config file > > > > > > Could you revert the patch : 77ff5e49c20bb72a99a12bfb00dbf90b2302f087 on your > > > machine, and check it again ? > > > > Hi Ling, > > > > I just successfully booted my machine 3 times in a row with a revert of > > commit a1e5278e40f16a4611264f8da9e557c16cb6f6ed from -tip. This is actually > > the same as reverting commit 77ff5e49c20bb72a99a12bfb00dbf90b2302f087, as > > a1e5278e40f16a4611264f8da9e557c16cb6f6ed is simply a merge of that commit > > (the diffs are exactly the same). > > > > Without this revert, the machine gets to: > > Please check latest -tip (2a74852 or later), the commit should be gone now. Will do, thanks! Mathieu > > There's clearly some (boundary-condition?) bug in the assembly code of > 77ff5e49c2. > > Thanks, > > Ingo -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |