From patchwork Tue Dec 22 00:19:58 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 69196 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.3/8.14.2) with ESMTP id nBM0Kj81024680 for ; Tue, 22 Dec 2009 00:21:21 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752231AbZLVAVU (ORCPT ); Mon, 21 Dec 2009 19:21:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752238AbZLVAVU (ORCPT ); Mon, 21 Dec 2009 19:21:20 -0500 Received: from smtp1.linux-foundation.org ([140.211.169.13]:33440 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752226AbZLVAVU (ORCPT ); Mon, 21 Dec 2009 19:21:20 -0500 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 nBM0Jx7d005067 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 21 Dec 2009 16:20:00 -0800 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 nBM0Jwbq004738; Mon, 21 Dec 2009 16:19:58 -0800 Message-Id: <200912220019.nBM0Jwbq004738@imap1.linux-foundation.org> Subject: [patch 1/9] arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c: avoid cross-CPU interrupts by using smp_call_function_any() To: lenb@kernel.org Cc: linux-acpi@vger.kernel.org, akpm@linux-foundation.org, davej@redhat.com, efault@gmx.de, jaswinder@kernel.org, len.brown@intel.com, mingo@elte.hu, rusty@rustcorp.com.au, tglx@linutronix.de, venkatesh.pallipadi@intel.com, yakui.zhao@intel.com, yanmin_zhang@linux.intel.com From: akpm@linux-foundation.org Date: Mon, 21 Dec 2009 16:19:58 -0800 MIME-Version: 1.0 X-Spam-Status: No, hits=-3.515 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-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org diff -puN arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c~arch-x86-kernel-cpu-cpufreq-acpi-cpufreqc-avoid-cross-cpu-interrupts-by-using-smp_call_function_any arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c --- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c~arch-x86-kernel-cpu-cpufreq-acpi-cpufreqc-avoid-cross-cpu-interrupts-by-using-smp_call_function_any +++ a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c @@ -190,9 +190,11 @@ static void do_drv_write(void *_cmd) static void drv_read(struct drv_cmd *cmd) { + int err; cmd->val = 0; - smp_call_function_single(cpumask_any(cmd->mask), do_drv_read, cmd, 1); + err = smp_call_function_any(cmd->mask, do_drv_read, cmd, 1); + WARN_ON_ONCE(err); /* smp_call_function_any() was buggy? */ } static void drv_write(struct drv_cmd *cmd)