debugfs: remove return value of debugfs_create_atomic_t()

No one checks the return value of debugfs_create_atomic_t(), as it's not
needed, so make the return value void, so that no one tries to do so in
the future.

Link: https://lore.kernel.org/r/20191016130332.GA28240@kroah.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/filesystems/debugfs.txt

@@ -113,8 +113,8 @@ lower-case values, or 1 or 0.  Any other input will be silently ignored.
 
 Also, atomic_t values can be placed in debugfs with:
 
-    struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
-				struct dentry *parent, atomic_t *value)
+    void debugfs_create_atomic_t(const char *name, umode_t mode,
+				 struct dentry *parent, atomic_t *value)
 
 A read of this file will get atomic_t values, and a write of this file
 will set atomic_t values.

fs/debugfs/file.c

@@ -757,12 +757,11 @@ DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_wo, NULL, debugfs_atomic_t_set,
  * @value: a pointer to the variable that the file should read to and write
  *         from.
  */
-struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
-				 struct dentry *parent, atomic_t *value)
+void debugfs_create_atomic_t(const char *name, umode_t mode,
+			     struct dentry *parent, atomic_t *value)
 {
-	return debugfs_create_mode_unsafe(name, mode, parent, value,
-					&fops_atomic_t, &fops_atomic_t_ro,
-					&fops_atomic_t_wo);
+	debugfs_create_mode_unsafe(name, mode, parent, value, &fops_atomic_t,
+				   &fops_atomic_t_ro, &fops_atomic_t_wo);
 }
 EXPORT_SYMBOL_GPL(debugfs_create_atomic_t);
 

include/linux/debugfs.h

@@ -117,8 +117,8 @@ void debugfs_create_x64(const char *name, umode_t mode, struct dentry *parent,
 			u64 *value);
 void debugfs_create_size_t(const char *name, umode_t mode,
 			   struct dentry *parent, size_t *value);
-struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
-				     struct dentry *parent, atomic_t *value);
+void debugfs_create_atomic_t(const char *name, umode_t mode,
+			     struct dentry *parent, atomic_t *value);
 struct dentry *debugfs_create_bool(const char *name, umode_t mode,
 				  struct dentry *parent, bool *value);
 
@@ -284,11 +284,10 @@ static inline void debugfs_create_size_t(const char *name, umode_t mode,
 					 struct dentry *parent, size_t *value)
 { }
 
-static inline struct dentry *debugfs_create_atomic_t(const char *name, umode_t mode,
-				     struct dentry *parent, atomic_t *value)
-{
-	return ERR_PTR(-ENODEV);
-}
+static inline void debugfs_create_atomic_t(const char *name, umode_t mode,
+					   struct dentry *parent,
+					   atomic_t *value)
+{ }
 
 static inline struct dentry *debugfs_create_bool(const char *name, umode_t mode,
 						 struct dentry *parent,