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From: Ingo Molnar <mingo@elte.hu>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Arjan van de Ven <arjan@infradead.org>, Andi Kleen <ak@muc.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [patch] x86: add -freg-struct-return to CFLAGS
Date: Thu, 22 Feb 2007 09:38:22 +0100 [thread overview]
Message-ID: <20070222083822.GB15068@elte.hu> (raw)
In-Reply-To: <45DD4FA0.5030205@goop.org>
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)
next prev parent reply other threads:[~2007-02-22 8:43 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-22 1:28 -freg-struct-return? Jeremy Fitzhardinge
2007-02-22 8:04 ` -freg-struct-return? Arjan van de Ven
2007-02-22 8:09 ` -freg-struct-return? Jeremy Fitzhardinge
2007-02-22 8:15 ` -freg-struct-return? Arjan van de Ven
2007-02-22 8:30 ` -freg-struct-return? Jeremy Fitzhardinge
2007-02-22 8:37 ` -freg-struct-return? Ingo Molnar
2007-02-22 8:38 ` Ingo Molnar [this message]
2007-02-22 11:23 ` [patch] x86: add -freg-struct-return to CFLAGS Andi Kleen
2007-02-22 11:27 ` Arjan van de Ven
2007-02-22 18:35 ` Adrian Bunk
2007-02-22 22:31 ` H. Peter Anvin
2007-02-22 9:50 ` -freg-struct-return? Jakub Jelinek
2007-02-22 11:22 ` -freg-struct-return? Andi Kleen
2007-02-22 16:42 ` -freg-struct-return? H. Peter Anvin
2007-02-22 17:39 ` -freg-struct-return? Jeremy Fitzhardinge
2007-02-22 18:36 ` -freg-struct-return? Andi Kleen
2007-02-22 18:48 ` -freg-struct-return? H. Peter Anvin
2007-02-23 0:21 ` -freg-struct-return? Andi Kleen
2007-02-22 18:56 ` -freg-struct-return? Jan Engelhardt
2007-02-22 19:12 ` -freg-struct-return? H. Peter Anvin
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