Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757195Ab3HLPrY (ORCPT ); Mon, 12 Aug 2013 11:47:24 -0400 Received: from g4t0017.houston.hp.com ([15.201.24.20]:4632 "EHLO g4t0017.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756863Ab3HLPrW (ORCPT ); Mon, 12 Aug 2013 11:47:22 -0400 From: Toshi Kani To: rjw@sisk.pl Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, srivatsa.bhat@linux.vnet.ibm.com, isimatu.yasuaki@jp.fujitsu.com, Toshi Kani Subject: [PATCH 0/2] Protect cpu map updates from ACPI processor Date: Mon, 12 Aug 2013 09:45:52 -0600 Message-Id: <1376322354-13026-1-git-send-email-toshi.kani@hp.com> X-Mailer: git-send-email 1.8.1.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1006 Lines: 27 CPU system maps are protected with reader/writer locks. The reader lock, put_online_cpus(), assures that the maps are not updated while holding the lock. The writer lock, cpu_hotplug_begin(), is used to udpate the cpu maps along with cpu_maps_update_begin(). However, the ACPI processor handler updates the cpu maps without holding the the writer lock. This patchset fixes this problem. --- The patchset is based on linux-next of the pm tree. --- Toshi Kani (2): CPU hotplug: Export cpu_hotplug_begin() interface ACPI: Acquire writer lock to update cpu maps --- drivers/acpi/acpi_processor.c | 21 ++++++++++++++++----- include/linux/cpu.h | 2 ++ kernel/cpu.c | 4 ++-- 3 files changed, 20 insertions(+), 7 deletions(-) -- 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/