linux-kernel - [PATCH 1/3][-mm] add class

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Date:	Tue, 20 May 2008 17:55:54 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	akpm@...ux-foundation.org
Cc:	greg@...ah.com, matthew@....cx, kay.sievers@...y.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: [PATCH 1/3][-mm] add class_reclassify macro

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 <hidave.darkstar@...il.com>

---
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_ */
--
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