From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yinghai Lu Subject: [PATCH] perf_counter: more barrier in blank weak function Date: Fri, 26 Dec 2008 21:05:06 -0800 Message-ID: <4955B782.3030407@kernel.org> References: <20081219105441.GA19750@linux.vnet.ibm.com> <86802c440812190351q3118516aif664dd5869c21b2a@mail.gmail.com> <20081219134636.GA11772@linux.vnet.ibm.com> <494C0BF0.3080109@kernel.org> <20081223132127.GA5450@linux.vnet.ibm.com> <495153A4.5060201@kernel.org> <20081224163400.GA11562@linux.vnet.ibm.com> <49529CE1.4040005@kernel.org> <20081226091217.GA5100@linux.vnet.ibm.com> <4954AC7B.3020603@kernel.org> <20081226102716.GA31450@uranus.ravnborg.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from hera.kernel.org ([140.211.167.34]:44640 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750707AbYL0FG1 (ORCPT ); Sat, 27 Dec 2008 00:06:27 -0500 In-Reply-To: <20081226102716.GA31450@uranus.ravnborg.org> Sender: linux-next-owner@vger.kernel.org List-ID: To: Sam Ravnborg , David Howells , mingo@elte.hu Cc: Kamalesh Babulal , Andrew Morton , Stephen Rothwell , linux-next@vger.kernel.org, LKML , mel@csn.ul.ie Impact: fix panic possible panic etc some compiler seems to inline the weak global function if no line in it Signed-off-by: Yinghai Lu diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index d7a79f3..37f7716 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -45,8 +45,8 @@ hw_perf_counter_init(struct perf_counter *counter) } u64 __weak hw_perf_save_disable(void) { return 0; } -void __weak hw_perf_restore(u64 ctrl) { } -void __weak hw_perf_counter_setup(void) { } +void __weak hw_perf_restore(u64 ctrl) { barrier(); } +void __weak hw_perf_counter_setup(void) { barrier(); } static void list_add_counter(struct perf_counter *counter, struct perf_counter_context *ctx)