Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757881AbZGCMpq (ORCPT ); Fri, 3 Jul 2009 08:45:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757757AbZGCMpU (ORCPT ); Fri, 3 Jul 2009 08:45:20 -0400 Received: from hera.kernel.org ([140.211.167.34]:59923 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757750AbZGCMpR (ORCPT ); Fri, 3 Jul 2009 08:45:17 -0400 Date: Fri, 3 Jul 2009 12:43:42 GMT From: tip-bot for Ingo Molnar To: linux-tip-commits@vger.kernel.org Cc: linux-kernel@vger.kernel.org, acme@redhat.com, paulus@samba.org, hpa@zytor.com, mingo@redhat.com, eric.dumazet@gmail.com, a.p.zijlstra@chello.nl, torvalds@linux-foundation.org, efault@gmx.de, arnd@arndb.de, dhowells@redhat.com, fweisbec@gmail.com, akpm@linux-foundation.org, tglx@linutronix.de, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, paulus@samba.org, acme@redhat.com, linux-kernel@vger.kernel.org, eric.dumazet@gmail.com, torvalds@linux-foundation.org, a.p.zijlstra@chello.nl, efault@gmx.de, arnd@arndb.de, fweisbec@gmail.com, dhowells@redhat.com, akpm@linux-foundation.org, tglx@linutronix.de, mingo@elte.hu In-Reply-To: References: Subject: [tip:perfcounters/urgent] x86: atomic64: Reduce size of functions Message-ID: Git-Commit-ID: 3ac805d2afd3fa4a07cb5bcf352fd7fa83f28935 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Fri, 03 Jul 2009 12:43:55 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2406 Lines: 68 Commit-ID: 3ac805d2afd3fa4a07cb5bcf352fd7fa83f28935 Gitweb: http://git.kernel.org/tip/3ac805d2afd3fa4a07cb5bcf352fd7fa83f28935 Author: Ingo Molnar AuthorDate: Fri, 3 Jul 2009 12:51:19 +0200 Committer: Ingo Molnar CommitDate: Fri, 3 Jul 2009 13:26:43 +0200 x86: atomic64: Reduce size of functions cmpxchg8b is a huge instruction in terms of register footprint, we almost never want to inline it, not even within the same code module. GCC 4.3 still messes up for two functions, under-judging the true cost of this instruction - so annotate two key functions to reduce the bloat: arch/x86/lib/atomic64_32.o: text data bss dec hex filename 1763 0 0 1763 6e3 atomic64_32.o.before 435 0 0 435 1b3 atomic64_32.o.after Cc: Linus Torvalds Cc: Eric Dumazet Cc: Peter Zijlstra Cc: Mike Galbraith Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo Cc: Frederic Weisbecker Cc: David Howells Cc: Andrew Morton Cc: Arnd Bergmann LKML-Reference: Signed-off-by: Ingo Molnar --- arch/x86/lib/atomic64_32.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/lib/atomic64_32.c b/arch/x86/lib/atomic64_32.c index 6195962..a910238 100644 --- a/arch/x86/lib/atomic64_32.c +++ b/arch/x86/lib/atomic64_32.c @@ -4,7 +4,7 @@ #include #include -static inline u64 cmpxchg8b(u64 *ptr, u64 old, u64 new) +static noinline u64 cmpxchg8b(u64 *ptr, u64 old, u64 new) { u32 low = new; u32 high = new >> 32; @@ -74,7 +74,7 @@ u64 atomic64_read(atomic64_t *ptr) * * Atomically adds @delta to @ptr and returns @delta + *@ptr */ -u64 atomic64_add_return(u64 delta, atomic64_t *ptr) +noinline u64 atomic64_add_return(u64 delta, atomic64_t *ptr) { /* * Try first with a (probably incorrect) assumption about -- 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/