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Date: Thu, 14 May 2015 10:08:01 -0700 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Denys Vlasenko <dvlasenk@...hat.com> Cc: Ingo Molnar <mingo@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...capital.net>, Oleg Nesterov <oleg@...hat.com>, Frederic Weisbecker <fweisbec@...il.com>, Alexei Starovoitov <ast@...mgrid.com>, Will Drewry <wad@...omium.org>, Kees Cook <keescook@...omium.org>, "the arch/x86 maintainers" <x86@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] x86/asm/entry/64: Use shorter MOVs from segmers registers On Thu, May 14, 2015 at 10:05 AM, Linus Torvalds <torvalds@...ux-foundation.org> wrote: > > I don't object to the patch, but did we actually confirm that it > always overwrites all of %ecx? Just to clarify: I don't object to the patch because the code doesn't actually end up *depending* on the high bits anyway, and does word-sized compares etc. And the instruction size and speed things I don't doubt. So it's just the commit message I wanted to check wrt that whole "always overwrites all of %ecx". Because older CPU's didn't necessarily (things like partial register writes are much less of an issue when you're in-order and stupid ;) 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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