From patchwork Mon Sep 14 21:49:18 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 47492 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n8ELnCsk032334 for ; Mon, 14 Sep 2009 21:49:40 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757117AbZINVtg (ORCPT ); Mon, 14 Sep 2009 17:49:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756973AbZINVtg (ORCPT ); Mon, 14 Sep 2009 17:49:36 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:50583 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756517AbZINVtf (ORCPT ); Mon, 14 Sep 2009 17:49:35 -0400 Received: from imap1.linux-foundation.org (imap1.linux-foundation.org [140.211.169.55]) by smtp1.linux-foundation.org (8.14.2/8.13.5/Debian-3ubuntu1.1) with ESMTP id n8ELnJj5022565 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 14 Sep 2009 14:49:20 -0700 Received: from localhost.localdomain (localhost [127.0.0.1]) by imap1.linux-foundation.org (8.13.5.20060308/8.13.5/Debian-3ubuntu1.1) with ESMTP id n8ELnJbp019009; Mon, 14 Sep 2009 14:49:19 -0700 Message-Id: <200909142149.n8ELnJbp019009@imap1.linux-foundation.org> Subject: [patch 18/18] kbuild: set -fconserve-stack option for gcc 4.5 To: sam@ravnborg.org Cc: linux-kbuild@vger.kernel.org, akpm@linux-foundation.org, andi@firstfloor.org, ak@linux.intel.com From: akpm@linux-foundation.org Date: Mon, 14 Sep 2009 14:49:18 -0700 MIME-Version: 1.0 X-Spam-Status: No, hits=-3.512 required=5 tests=AWL, BAYES_00, OSDL_HEADER_SUBJECT_BRACKETED X-Spam-Checker-Version: SpamAssassin 3.2.4-osdl_revision__1.47__ X-MIMEDefang-Filter: lf$Revision: 1.188 $ X-Scanned-By: MIMEDefang 2.63 on 140.211.169.13 Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org From: Andi Kleen The upcomming gcc 4.5 has a new -fconserve-stack option that tells the inliner to take stack frame size in account. Set it if the compiler supports it. Signed-off-by: Andi Kleen Cc: Sam Ravnborg Signed-off-by: Andrew Morton --- Makefile | 3 +++ 1 file changed, 3 insertions(+) diff -puN Makefile~kbuild-set-fconserve-stack-option-for-gcc-45 Makefile --- a/Makefile~kbuild-set-fconserve-stack-option-for-gcc-45 +++ a/Makefile @@ -573,6 +573,9 @@ KBUILD_CFLAGS += $(call cc-option,-fno-s # revert to pre-gcc-4.4 behaviour of .eh_frame KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm) +# conserve stack if available +KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) + # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments # But warn user when we do so warn-assign = \