From: Thomas Gleixner Date: Sat, 28 Nov 2009 14:03:03 +0000 (+0100) Subject: x86: Use -maccumulate-outgoing-args for sane mcount prologues X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b8b7d791a8ff01d2380089279a69afa99115fb23;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git x86: Use -maccumulate-outgoing-args for sane mcount prologues 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 Signed-off-by: Thomas Gleixner Cc: Linus Torvalds Cc: stable@kernel.org --- diff --git a/arch/x86/Makefile_32.cpu b/arch/x86/Makefile_32.cpu index df7fdf811997..1937226fd502 100644 --- a/arch/x86/Makefile_32.cpu +++ b/arch/x86/Makefile_32.cpu @@ -49,8 +49,9 @@ cflags-$(CONFIG_X86_GENERIC) += $(call tune,generic,$(call tune,i686)) # 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.