debugobjects: make fixup functions return bool instead of int

I am going to introduce debugobjects infrastructure to USB subsystem.
But before this, I found the code of debugobjects could be improved.
This patchset will make fixup functions return bool type instead of int.
Because fixup only need report success or no.  boolean is the 'real'
type.

This patch (of 7):

The object debugging infrastructure core provides some fixup callbacks
for the subsystem who use it.  These callbacks are called from the debug
code whenever a problem in debug_object_init is detected.  And
debugobjects core suppose them returns 1 when the fixup was successful,
otherwise 0.  So the return type is boolean.

A bad thing is that debug_object_fixup use the return value for
arithmetic operation.  It confused me that what is the reall return
type.

Reading over the whole code, I found some place do use the return value
incorrectly(see next patch).  So why use bool type instead?

Signed-off-by: Du, Changbin <changbin.du@intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Josh Triplett <josh@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 7 deletions

diff --git a/include/linux/debugobjects.h b/include/linux/debugobjects.h
index 98ffcbd4888e..a899f10c9365 100644
--- a/include/linux/debugobjects.h
+++ b/include/linux/debugobjects.h
@@ -39,7 +39,8 @@ struct debug_obj {
  * @debug_hint:         function returning address, which have associated
  *                      kernel symbol, to allow identify the object
  * @fixup_init:         fixup function, which is called when the init check
- *                      fails
+ *                      fails. All fixup functions must return true if fixup
+ *                      was successful, otherwise return false
  * @fixup_activate:     fixup function, which is called when the activate check
  *                      fails
  * @fixup_destroy:      fixup function, which is called when the destroy check
@@ -51,12 +52,12 @@ struct debug_obj {
  */
 struct debug_obj_descr {
         const char              *name;
-        void *(*debug_hint)     (void *addr);
-        int (*fixup_init)       (void *addr, enum debug_obj_state state);
-        int (*fixup_activate)   (void *addr, enum debug_obj_state state);
-        int (*fixup_destroy)    (void *addr, enum debug_obj_state state);
-        int (*fixup_free)       (void *addr, enum debug_obj_state state);
-        int (*fixup_assert_init)(void *addr, enum debug_obj_state state);
+        void *(*debug_hint)(void *addr);
+        bool (*fixup_init)(void *addr, enum debug_obj_state state);
+        bool (*fixup_activate)(void *addr, enum debug_obj_state state);
+        bool (*fixup_destroy)(void *addr, enum debug_obj_state state);
+        bool (*fixup_free)(void *addr, enum debug_obj_state state);
+        bool (*fixup_assert_init)(void *addr, enum debug_obj_state state);
 };
 
 #ifdef CONFIG_DEBUG_OBJECTS