linux-kernel - [035/151] x86: Use -maccumulate-outgoing-args for sane mcount prologues

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Date:	Wed, 16 Dec 2009 19:55:32 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [035/151] x86: Use -maccumulate-outgoing-args for sane mcount prologues

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Thomas Gleixner <tglx@...utronix.de>

commit b8b7d791a8ff01d2380089279a69afa99115fb23 upstream.

commit 746357d (x86: Prevent GCC 4.4.x (pentium-mmx et al) function
prologue wreckage) uses -mtune=generic to work around the function
prologue problem with mcount on -march=pentium-mmx and others.

Jakub pointed out that we can use -maccumulate-outgoing-args instead
which is selected by -mtune=generic and prevents the problem without
losing the -march specific optimizations.

Pointed-out-by: Jakub Jelinek <jakub@...hat.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/Makefile_32.cpu |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/arch/x86/Makefile_32.cpu
+++ b/arch/x86/Makefile_32.cpu
@@ -49,8 +49,9 @@ cflags-$(CONFIG_X86_GENERIC) 	+= $(call 
 # Work around the pentium-mmx code generator madness of gcc4.4.x which
 # does stack alignment by generating horrible code _before_ the mcount
 # prologue (push %ebp, mov %esp, %ebp) which breaks the function graph
-# tracer assumptions
-cflags-$(CONFIG_FUNCTION_GRAPH_TRACER) += $(call cc-option,-mtune=generic)
+# tracer assumptions. For i686, generic, core2 this is set by the
+# compiler anyway
+cflags-$(CONFIG_FUNCTION_GRAPH_TRACER) += $(call cc-option,-maccumulate-outgoing-args)
 
 # Bug fix for binutils: this option is required in order to keep
 # binutils from generating NOPL instructions against our will.


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