From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765453AbYETJ6A (ORCPT ); Tue, 20 May 2008 05:58:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1764769AbYETJys (ORCPT ); Tue, 20 May 2008 05:54:48 -0400 Received: from ug-out-1314.google.com ([66.249.92.172]:24860 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1764954AbYETJyr (ORCPT ); Tue, 20 May 2008 05:54:47 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:mime-version:content-type:content-disposition:user-agent; b=l2Lmc0jMLirbCJtir3X+mGWWU8qFiazMfQbE0rfO4sP1CHjPCdQySZnlFfzIQ6/h3CuqJMUbrxcY18iILW91iE+K1sj0r6m57hwX1cMPxhktfapBkgO6JAVYKGeYvosPkSQcfL+N0+bWUKkHWxaBrES9XEuGsaCMaz2dlWXMxUk= Date: Tue, 20 May 2008 17:55:54 +0800 From: Dave Young To: akpm@linux-foundation.org Cc: greg@kroah.com, matthew@wil.cx, kay.sievers@vrfy.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org Subject: [PATCH 1/3][-mm] add class_reclassify macro Message-ID: <20080520095553.GA3201@darkstar.te-china.tietoenator.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Converting class semaphore to mutex cause lockdep warnings due to class_interface_register/unregister will possible call device_add/del For the class_interface users here add a class_reclassify macro to reclassify the lock class of their struct class. Signed-off-by: Dave Young --- include/linux/device.h | 7 +++++++ 1 file changed, 7 insertions(+) --- linux/include/linux/device.h 2008-05-19 12:29:54.000000000 +0800 +++ linux.new/include/linux/device.h 2008-05-19 14:42:25.000000000 +0800 @@ -529,4 +529,11 @@ extern const char *dev_driver_string(str MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor)) #define MODULE_ALIAS_CHARDEV_MAJOR(major) \ MODULE_ALIAS("char-major-" __stringify(major) "-*") + +#define class_reclassify(class) \ +do { \ + static struct lock_class_key class_key; \ + lockdep_set_class_and_name(&(class)->mutex, &class_key, \ + (class)->name); \ +} while (0) #endif /* _DEVICE_H_ */