Messages in this thread Patch in this message | | | Date | Thu, 22 Feb 2007 09:38:22 +0100 | From | Ingo Molnar <> | Subject | [patch] x86: add -freg-struct-return to CFLAGS |
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Subject: [patch] x86: add -freg-struct-return to CFLAGS From: Ingo Molnar <mingo@elte.hu>
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 <mingo@elte.hu> --- arch/i386/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux/arch/i386/Makefile =================================================================== --- linux.orig/arch/i386/Makefile +++ linux/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) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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