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linux-sg2042
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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: Sergey Vlasov <vsu@altlinux.ru>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Sergey Vlasov 2006-06-26 13:59:32 +02:00 committed by Linus Torvalds
parent 899ced0dd9
commit 409f89e0ef
1 changed files with 3 additions and 1 deletions
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4
arch/x86_64/Makefile
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@ -27,6 +27,7 @@ LDFLAGS_vmlinux :=
CHECKFLAGS += -D__x86_64__ -m64 CHECKFLAGS += -D__x86_64__ -m64
cflags-y := cflags-y :=
cflags-kernel-y :=
cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
@ -35,7 +36,7 @@ cflags-y += -m64
cflags-y += -mno-red-zone cflags-y += -mno-red-zone
cflags-y += -mcmodel=kernel cflags-y += -mcmodel=kernel
cflags-y += -pipe cflags-y += -pipe
cflags-$(CONFIG_REORDER) += -ffunction-sections cflags-kernel-$(CONFIG_REORDER) += -ffunction-sections
# this makes reading assembly source easier, but produces worse code # this makes reading assembly source easier, but produces worse code
# actually it makes the kernel smaller too. # actually it makes the kernel smaller too.
cflags-y += -fno-reorder-blocks 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-y += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
CFLAGS += $(cflags-y) CFLAGS += $(cflags-y)
CFLAGS_KERNEL += $(cflags-kernel-y)
AFLAGS += -m64 AFLAGS += -m64
head-y := arch/x86_64/kernel/head.o arch/x86_64/kernel/head64.o arch/x86_64/kernel/init_task.o head-y := arch/x86_64/kernel/head.o arch/x86_64/kernel/head64.o arch/x86_64/kernel/init_task.o