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Date: Fri, 8 Mar 2019 22:33:43 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Josh Poimboeuf <jpoimboe@...hat.com> Cc: torvalds@...ux-foundation.org, tglx@...utronix.de, hpa@...or.com, julien.thierry@....com, will.deacon@....com, luto@...capital.net, mingo@...nel.org, catalin.marinas@....com, james.morse@....com, valentin.schneider@....com, brgerst@...il.com, luto@...nel.org, bp@...en8.de, dvlasenk@...hat.com, linux-kernel@...r.kernel.org, dvyukov@...gle.com, rostedt@...dmis.org Subject: Re: [PATCH 20/20] objtool: Add Direction Flag validation On Fri, Mar 08, 2019 at 03:16:03PM -0600, Josh Poimboeuf wrote: > On Thu, Mar 07, 2019 at 12:45:31PM +0100, Peter Zijlstra wrote: > > Having DF escape is BAD(tm). > > > > Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org> > > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org> > > Can you elaborate on why (in the patch description)? Did this actually > find any occurrences? Nope, didn't find anything. Also, all DF users are in asm so I didn't really expect any. Having it escape would probably result in fairly instant wreckage though. DF=1 results in things like rep mov going _backwards_.
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