From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752159Ab1JWP5q (ORCPT ); Sun, 23 Oct 2011 11:57:46 -0400 Received: from mail-ey0-f174.google.com ([209.85.215.174]:60830 "EHLO mail-ey0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752082Ab1JWP5o (ORCPT ); Sun, 23 Oct 2011 11:57:44 -0400 From: Gilad Ben-Yossef To: linux-kernel@vger.kernel.org Cc: Gilad Ben-Yossef , Peter Zijlstra , Frederic Weisbecker , Russell King , linux-mm@kvack.org, Christoph Lameter , Pekka Enberg , Matt Mackall , Sasha Levin Subject: [PATCH v2 1/6] smp: Introduce a generic on_each_cpu_mask function Date: Sun, 23 Oct 2011 17:56:48 +0200 Message-Id: <1319385413-29665-2-git-send-email-gilad@benyossef.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1319385413-29665-1-git-send-email-gilad@benyossef.com> References: <1319385413-29665-1-git-send-email-gilad@benyossef.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org on_each_cpu_mask calls a function on processors specified my cpumask, which may include the local processor. All the limitation specified in smp_call_function_many apply. Signed-off-by: Gilad Ben-Yossef Acked-by: Chris Metcalf CC: Peter Zijlstra CC: Frederic Weisbecker CC: Russell King CC: linux-mm@kvack.org CC: Christoph Lameter CC: Pekka Enberg CC: Matt Mackall CC: Sasha Levin --- include/linux/smp.h | 16 ++++++++++++++++ kernel/smp.c | 20 ++++++++++++++++++++ 2 files changed, 36 insertions(+), 0 deletions(-) diff --git a/include/linux/smp.h b/include/linux/smp.h index 8cc38d3..60628d7 100644 --- a/include/linux/smp.h +++ b/include/linux/smp.h @@ -102,6 +102,13 @@ static inline void call_function_init(void) { } int on_each_cpu(smp_call_func_t func, void *info, int wait); /* + * Call a function on processors specified by mask, which might include + * the local one. + */ +void on_each_cpu_mask(const struct cpumask *mask, void (*func)(void *), + void *info, bool wait); + +/* * Mark the boot cpu "online" so that it can call console drivers in * printk() and can access its per-cpu storage. */ @@ -132,6 +139,15 @@ static inline int up_smp_call_function(smp_call_func_t func, void *info) local_irq_enable(); \ 0; \ }) +#define on_each_cpu_mask(mask, func, info, wait) \ + do { \ + if (cpumask_test_cpu(0, (mask))) { \ + local_irq_disable(); \ + (func)(info); \ + local_irq_enable(); \ + } \ + } while (0) + static inline void smp_send_reschedule(int cpu) { } #define num_booting_cpus() 1 #define smp_prepare_boot_cpu() do {} while (0) diff --git a/kernel/smp.c b/kernel/smp.c index fb67dfa..df37c08 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -701,3 +701,23 @@ int on_each_cpu(void (*func) (void *info), void *info, int wait) return ret; } EXPORT_SYMBOL(on_each_cpu); + +/* + * Call a function on processors specified by cpumask, which may include + * the local processor. All the limitation specified in smp_call_function_many + * apply. + */ +void on_each_cpu_mask(const struct cpumask *mask, void (*func)(void *), + void *info, bool wait) +{ + int cpu = get_cpu(); + + smp_call_function_many(mask, func, info, wait); + if (cpumask_test_cpu(cpu, mask)) { + local_irq_disable(); + func(info); + local_irq_enable(); + } + put_cpu(); +} +EXPORT_SYMBOL(on_each_cpu_mask); -- 1.7.0.4