From: Ingo Molnar Date: Thu, 22 Feb 2007 08:38:22 +0000 (+0100) Subject: [PATCH] x86: add -freg-struct-return to CFLAGS X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=25165120f2432ffa36518d53bd3ec66f6e434f63;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git [PATCH] x86: add -freg-struct-return to CFLAGS Jeremy Fitzhardinge suggested the use of -freg-struct-return, which does structure-returns (such as when using pte_t) in registers instead of on the stack. that is indeed so, and this option reduced the kernel size a bit: text data bss dec hex filename 4799506 543456 3760128 9103090 8ae6f2 vmlinux.before 4798117 543456 3760128 9101701 8ae185 vmlinux.after the resulting kernel booted fine on my testbox. Lets go for it. Signed-off-by: Ingo Molnar Signed-off-by: Linus Torvalds --- diff --git a/arch/i386/Makefile b/arch/i386/Makefile index f7ac1aea1d8a..bd28f9f9b4b7 100644 --- a/arch/i386/Makefile +++ b/arch/i386/Makefile @@ -31,7 +31,7 @@ LDFLAGS_vmlinux := --emit-relocs endif CHECKFLAGS += -D__i386__ -CFLAGS += -pipe -msoft-float -mregparm=3 +CFLAGS += -pipe -msoft-float -mregparm=3 -freg-struct-return # prevent gcc from keeping the stack 16 byte aligned CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)