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Commit 409f89e0 authored by Sergey Vlasov's avatar Sergey Vlasov Committed by Linus Torvalds
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[PATCH] x86_64: Do not use -ffunction-sections for modules 



Currently CONFIG_REORDER uses -ffunction-sections for all code;
however, creating a separate section for each function is not useful
for modules and just adds bloat.  Moving this option from CFLAGS to
CFLAGS_KERNEL shrinks module object files (e.g., the module tree for a
kernel built with most drivers as modules shrinked from 54M to 46M),
and decreases the number of sysfs files in /sys/module/*/sections/
directories.

Signed-off-by: default avatarSergey Vlasov <vsu@altlinux.ru>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 899ced0d

arch/x86_64/Makefile

+3 −1
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ LDFLAGS_vmlinux := 
CHECKFLAGS      += -D__x86_64__ -m64



cflags-y	:=

cflags-kernel-y	:=

cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)

cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)

cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
@@ -35,7 +36,7 @@ cflags-y += -m64 
cflags-y += -mno-red-zone

cflags-y += -mcmodel=kernel

cflags-y += -pipe

cflags-$(CONFIG_REORDER) += -ffunction-sections

cflags-kernel-$(CONFIG_REORDER) += -ffunction-sections

# this makes reading assembly source easier, but produces worse code

# actually it makes the kernel smaller too.

cflags-y += -fno-reorder-blocks
@@ -55,6 +56,7 @@ cflags-y += $(call cc-option,-funit-at-a-time) 
cflags-y += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)



CFLAGS += $(cflags-y)

CFLAGS_KERNEL += $(cflags-kernel-y)

AFLAGS += -m64



head-y := arch/x86_64/kernel/head.o arch/x86_64/kernel/head64.o arch/x86_64/kernel/init_task.o