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debugobjects: Make debug_object_activate() return status

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In order to better respond to things like duplicate invocations
of call_rcu(), RCU needs to see the status of a call to
debug_object_activate().  This would allow RCU to leak the callback in
order to avoid adding freelist-reuse mischief to the duplicate invoations.
This commit therefore makes debug_object_activate() return status,
zero for success and -EINVAL for failure.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2013-04-23 12:51:11 -07:00
parent 15100df81f
commit b778ae2536
2 changed files with 17 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

6
include/linux/debugobjects.h
View file

@ -63,7 +63,7 @@ struct debug_obj_descr {
extern void debug_object_init (void *addr, struct debug_obj_descr *descr);
extern void
debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr);
extern void debug_object_activate (void *addr, struct debug_obj_descr *descr);
extern int debug_object_activate (void *addr, struct debug_obj_descr *descr);
extern void debug_object_deactivate(void *addr, struct debug_obj_descr *descr);
extern void debug_object_destroy (void *addr, struct debug_obj_descr *descr);
extern void debug_object_free (void *addr, struct debug_obj_descr *descr);
@ -85,8 +85,8 @@ static inline void
debug_object_init (void *addr, struct debug_obj_descr *descr) { }
static inline void
debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) { }
static inline void
debug_object_activate (void *addr, struct debug_obj_descr *descr) { }
static inline int
debug_object_activate (void *addr, struct debug_obj_descr *descr) { return 0; }
static inline void
debug_object_deactivate(void *addr, struct debug_obj_descr *descr) { }
static inline void