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Open Source and information security mailing list archives
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Date: Mon, 23 Nov 2009 04:16:02 -0500 From: Jakub Jelinek <jakub@...hat.com> To: Thomas Gleixner <tglx@...utronix.de> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Haley <aph@...hat.com>, Richard Guenther <richard.guenther@...il.com>, rostedt@...dmis.org, Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>, LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Heiko Carstens <heiko.carstens@...ibm.com>, feng.tang@...el.com, Fr??d??ric Weisbecker <fweisbec@...il.com>, Peter Zijlstra <peterz@...radead.org>, gcc@....gnu.org Subject: Re: BUG: GCC-4.4.x changes the function frame on some functions On Thu, Nov 19, 2009 at 08:01:57PM +0100, Thomas Gleixner wrote: > Just compiled with -mincoming-stack-boundary=4 and the problem goes > away as gcc now thinks that the incoming stack is already 16 byte > aligned. But that might break code which actually uses SSE Please don't do this, lying to the compiler is just going to result in wrong-code sooner or later, with the above switch gcc will assume the incoming stack is 16-byte aligned (which is not true in the ix86 kernel) and could very well e.g. optimize away code that looks at alignment of stack variables etc. Jakub -- 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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