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authorEric W. Biederman <ebiederm@xmission.com>2010-02-12 04:35:32 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-03-07 17:04:51 -0800
commit35960258ed388cdcebdb71df35fd5126978ca325 (patch)
tree138516adc0b6232c57f9755788987fee18f26de8 /include
parenta07e4156a2ee6359d31a44946d7ee7f85dbf6bca (diff)
sysfs: Document sysfs_attr_init and sysfs_bin_attr_init
I have added a new requirement to the external sysfs interface that dynamically allocated sysfs attributes must call sysfs_attr_init if lockdep is enabled. For the time being callying sysfs_attr_init is only mandatory if lockdep is enabled, so we can live with a few unconverted instances until we find them all. As this is part of the public interface of sysfs it is a good idea to document these pseudo functions so someone inspeciting the code can find out what has happened. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sysfs.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 006c359e63c0..5b8f80f5aca6 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -36,6 +36,16 @@ struct attribute {
#endif
};
+/**
+ * sysfs_attr_init - initialize a dynamically allocated sysfs attribute
+ * @attr: struct attribute to initialize
+ *
+ * Initialize a dynamically allocated struct attribute so we can
+ * make lockdep happy. This is a new requirement for attributes
+ * and initially this is only needed when lockdep is enabled.
+ * Lockdep gives a nice error when your attribute is added to
+ * sysfs if you don't have this.
+ */
#ifdef CONFIG_DEBUG_LOCK_ALLOC
#define sysfs_attr_init(attr) \
do { \
@@ -90,6 +100,16 @@ struct bin_attribute {
struct vm_area_struct *vma);
};
+/**
+ * sysfs_bin_attr_init - initialize a dynamically allocated bin_attribute
+ * @attr: struct bin_attribute to initialize
+ *
+ * Initialize a dynamically allocated struct bin_attribute so we
+ * can make lockdep happy. This is a new requirement for
+ * attributes and initially this is only needed when lockdep is
+ * enabled. Lockdep gives a nice error when your attribute is
+ * added to sysfs if you don't have this.
+ */
#define sysfs_bin_attr_init(bin_attr) sysfs_attr_init(&bin_attr->attr)
struct sysfs_ops {