From 96d55b882b85b26711a06d8fb2c901df9d52a48b Mon Sep 17 00:00:00 2001 From: Paolo 'Blaisorblade' Giarrusso Date: Sun, 30 Oct 2005 15:00:07 -0800 Subject: [PATCH] uml: reuse i386 cpu-specific tuning Make UML share the underlying cpu-specific tuning done on i386. Actually, for now many config options aren't used a lot - but that can be done later. Also, UML relies on GCC optimization for things like memcpy and such more than i386, so specifying the correct -march and -mtune should be enough. Later, we may want to correct some other stuff. For instance, since FPU context switching, for us, is done (at least partially, i.e. between our kernelspace and userspace) by the host, we may allow usage of FPU operations by GCC. This doesn't hold for kernelspace vs. kernelspace, but we don't support preemption. Signed-off-by: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/Makefile-i386 | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'arch/um/Makefile-i386') diff --git a/arch/um/Makefile-i386 b/arch/um/Makefile-i386 index 2ee8a285811..4a0b375101e 100644 --- a/arch/um/Makefile-i386 +++ b/arch/um/Makefile-i386 @@ -32,3 +32,13 @@ CFLAGS += -U__$(SUBARCH)__ -U$(SUBARCH) ifneq ($(CONFIG_GPROF),y) ARCH_CFLAGS += -DUM_FASTCALL endif + +# First of all, tune CFLAGS for the specific CPU. This actually sets cflags-y. +include $(srctree)/arch/i386/Makefile.cpu + +# prevent gcc from keeping the stack 16 byte aligned. Taken from i386. +cflags-y += $(call cc-option,-mpreferred-stack-boundary=2) + +CFLAGS += $(cflags-y) +USER_CFLAGS += $(cflags-y) + -- cgit v1.2.3-18-g5258 From 6a351cfeadd4b56a2a0031020c0cfb07cc0337fb Mon Sep 17 00:00:00 2001 From: Paolo 'Blaisorblade' Giarrusso Date: Sun, 30 Oct 2005 15:00:08 -0800 Subject: [PATCH] uml: remove old UM_FASTCALL, and make the thing work again This was used in the old dark age of 2.4, ARCH_CFLAGS doesn't work any more since some time, and UM_FASTCALL was never used in 2.6. Instead, reintroduce the thing more properly now, directly in include/asm-um/linkage.h. Signed-off-by: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/Makefile-i386 | 4 ---- 1 file changed, 4 deletions(-) (limited to 'arch/um/Makefile-i386') diff --git a/arch/um/Makefile-i386 b/arch/um/Makefile-i386 index 4a0b375101e..aef7c50f8e1 100644 --- a/arch/um/Makefile-i386 +++ b/arch/um/Makefile-i386 @@ -29,10 +29,6 @@ endif CFLAGS += -U__$(SUBARCH)__ -U$(SUBARCH) -ifneq ($(CONFIG_GPROF),y) -ARCH_CFLAGS += -DUM_FASTCALL -endif - # First of all, tune CFLAGS for the specific CPU. This actually sets cflags-y. include $(srctree)/arch/i386/Makefile.cpu -- cgit v1.2.3-18-g5258