commit b1e4d9d82df8ab9097f80aa208c40eab6fc29858
author Du, Changbin <changbin.du@intel.com> Thu May 19 17:09:20 2016 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Thu May 19 19:12:14 2016 -0700
tree b62106f744b91e4851dc50059ed5ce5f19ead66e
parent b21e91c305bcebf55b7a34638e5885528f3fb453

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>

lib/debugobjects.c

diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index 519b5a1..a9cee16 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -269,16 +269,15 @@
  * Try to repair the damage, so we have a better chance to get useful
  * debug output.
  */
-static int
-debug_object_fixup(int (*fixup)(void *addr, enum debug_obj_state state),
+static bool
+debug_object_fixup(bool (*fixup)(void *addr, enum debug_obj_state state),
 		   void * addr, enum debug_obj_state state)
 {
-	int fixed = 0;
-
-	if (fixup)
-		fixed = fixup(addr, state);
-	debug_objects_fixups += fixed;
-	return fixed;
+	if (fixup && fixup(addr, state)) {
+		debug_objects_fixups++;
+		return true;
+	}
+	return false;
 }
 
 static void debug_object_is_on_stack(void *addr, int onstack)
@@ -797,7 +796,7 @@
  * fixup_init is called when:
  * - an active object is initialized
  */
-static int __init fixup_init(void *addr, enum debug_obj_state state)
+static bool __init fixup_init(void *addr, enum debug_obj_state state)
 {
 	struct self_test *obj = addr;
 
@@ -805,9 +804,9 @@
 	case ODEBUG_STATE_ACTIVE:
 		debug_object_deactivate(obj, &descr_type_test);
 		debug_object_init(obj, &descr_type_test);
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }
 
@@ -816,7 +815,7 @@
  * - an active object is activated
  * - an unknown object is activated (might be a statically initialized object)
  */
-static int __init fixup_activate(void *addr, enum debug_obj_state state)
+static bool __init fixup_activate(void *addr, enum debug_obj_state state)
 {
 	struct self_test *obj = addr;
 
@@ -825,17 +824,17 @@
 		if (obj->static_init == 1) {
 			debug_object_init(obj, &descr_type_test);
 			debug_object_activate(obj, &descr_type_test);
-			return 0;
+			return false;
 		}
-		return 1;
+		return true;
 
 	case ODEBUG_STATE_ACTIVE:
 		debug_object_deactivate(obj, &descr_type_test);
 		debug_object_activate(obj, &descr_type_test);
-		return 1;
+		return true;
 
 	default:
-		return 0;
+		return false;
 	}
 }
 
@@ -843,7 +842,7 @@
  * fixup_destroy is called when:
  * - an active object is destroyed
  */
-static int __init fixup_destroy(void *addr, enum debug_obj_state state)
+static bool __init fixup_destroy(void *addr, enum debug_obj_state state)
 {
 	struct self_test *obj = addr;
 
@@ -851,9 +850,9 @@
 	case ODEBUG_STATE_ACTIVE:
 		debug_object_deactivate(obj, &descr_type_test);
 		debug_object_destroy(obj, &descr_type_test);
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }
 
@@ -861,7 +860,7 @@
  * fixup_free is called when:
  * - an active object is freed
  */
-static int __init fixup_free(void *addr, enum debug_obj_state state)
+static bool __init fixup_free(void *addr, enum debug_obj_state state)
 {
 	struct self_test *obj = addr;
 
@@ -869,9 +868,9 @@
 	case ODEBUG_STATE_ACTIVE:
 		debug_object_deactivate(obj, &descr_type_test);
 		debug_object_free(obj, &descr_type_test);
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 }