Messages in this thread Patch in this message | | | Date | Tue, 20 May 2008 17:55:54 +0800 | From | Dave Young <> | Subject | [PATCH 1/3][-mm] add class_reclassify macro |
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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@gmail.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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