The patch titled
i386: fix usage of -mtune when X86_GENERIC=y or CONFIG_MCORE2=y
has been added to the -mm tree. Its filename is
i386-fix-usage-of-mtune-when-x86_generic=y-or-config_mcore2=y.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: i386: fix usage of -mtune when X86_GENERIC=y or CONFIG_MCORE2=y
From: Lasse Collin <lasse.collin@xxxxxxxxxxx>
Two fixes to arch/i386/Makefile.cpu:
1) When X86_GENERIC=y is set, use -mtune=i686 if $(CC) doesn't
support -mtune=generic. GCC 4.1.2 and earlier don't support
-mtune=generic. When building a generic kernel for a distro
that runs on i586 and better, it is nice to use
-march=i586 -mtune=i686 instead of plain -march=i586.
2) Use $(call tune) instead of hardcoded -mtune when CONFIG_MCORE2=y.
This makes it possible to have CONFIG_MCORE2=y when using GCC 3.3,
which uses -mcpu instead of -mtune. Also dropped fallback to
-mtune=generic and -mtune=i686, because -march=i686 already
implies -mtune=i686.
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/i386/Makefile.cpu | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff -puN arch/i386/Makefile.cpu~i386-fix-usage-of-mtune-when-x86_generic=y-or-config_mcore2=y arch/i386/Makefile.cpu
--- a/arch/i386/Makefile.cpu~i386-fix-usage-of-mtune-when-x86_generic=y-or-config_mcore2=y
+++ a/arch/i386/Makefile.cpu
@@ -4,9 +4,9 @@
#-mtune exists since gcc 3.4
HAS_MTUNE := $(call cc-option-yn, -mtune=i386)
ifeq ($(HAS_MTUNE),y)
-tune = $(call cc-option,-mtune=$(1),)
+tune = $(call cc-option,-mtune=$(1),$(2))
else
-tune = $(call cc-option,-mcpu=$(1),)
+tune = $(call cc-option,-mcpu=$(1),$(2))
endif
align := $(cc-option-align)
@@ -33,7 +33,7 @@ cflags-$(CONFIG_MWINCHIP3D) += $(call cc
cflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
cflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686)
cflags-$(CONFIG_MVIAC7) += -march=i686
-cflags-$(CONFIG_MCORE2) += -march=i686 $(call cc-option,-mtune=core2,$(call cc-option,-mtune=generic,-mtune=i686))
+cflags-$(CONFIG_MCORE2) += -march=i686 $(call tune,core2)
# AMD Elan support
cflags-$(CONFIG_X86_ELAN) += -march=i486
@@ -43,5 +43,5 @@ cflags-$(CONFIG_MGEODEGX1) += -march=pen
# add at the end to overwrite eventual tuning options from earlier
# cpu entries
-cflags-$(CONFIG_X86_GENERIC) += $(call tune,generic)
+cflags-$(CONFIG_X86_GENERIC) += $(call tune,generic,$(call tune,i686))
_
Patches currently in -mm which might be from lasse.collin@xxxxxxxxxxx are
i386-fix-usage-of-mtune-when-x86_generic=y-or-config_mcore2=y.patch
-
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