From 8b6a6308e076606d847d6c5625f9002c6a6a9ecb Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Wed, 30 Nov 2011 15:07:56 +1100 Subject: [PATCH] debugobjects: be smarter about static objects Remove the WARN_ON() in timer_fixup_activate() and actually use the return code from fixup to tell the debugobjects code to print a warning. This provides better diagnostic information via a nice debugobjects warning instead of a simple WARN_ON(1) in the timer code with no information as to what is wrong. We also assign a dummy timer callback so that if the timer is actually set to fire we don't oops. Signed-off-by: Stephen Boyd Cc: Christine Chan Cc: John Stultz Cc: Thomas Gleixner Signed-off-by: Andrew Morton --- kernel/timer.c | 9 ++++++++- lib/debugobjects.c | 15 +++++++++++---- 2 files changed, 19 insertions(+), 5 deletions(-) diff --git a/kernel/timer.c b/kernel/timer.c index dbaa62422b13..317087d5d5fc 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -427,6 +427,12 @@ static int timer_fixup_init(void *addr, enum debug_obj_state state) } } +/* Stub timer callback for improperly used timers. */ +static void stub_timer(unsigned long data) +{ + WARN_ON(1); +} + /* * fixup_activate is called when: * - an active object is activated @@ -450,7 +456,8 @@ static int timer_fixup_activate(void *addr, enum debug_obj_state state) debug_object_activate(timer, &timer_debug_descr); return 0; } else { - WARN_ON_ONCE(1); + setup_timer(timer, stub_timer, 0); + return 1; } return 0; diff --git a/lib/debugobjects.c b/lib/debugobjects.c index a78b7c6e042c..0b07cc5ba237 100644 --- a/lib/debugobjects.c +++ b/lib/debugobjects.c @@ -268,12 +268,15 @@ static void debug_print_object(struct debug_obj *obj, char *msg) * Try to repair the damage, so we have a better chance to get useful * debug output. */ -static void +static int debug_object_fixup(int (*fixup)(void *addr, enum debug_obj_state state), void * addr, enum debug_obj_state state) { + int fixed = 0; if (fixup) - debug_objects_fixups += fixup(addr, state); + fixed = fixup(addr, state); + debug_objects_fixups += fixed; + return fixed; } static void debug_object_is_on_stack(void *addr, int onstack) @@ -386,6 +389,9 @@ void debug_object_activate(void *addr, struct debug_obj_descr *descr) struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; + struct debug_obj o = { .object = addr, + .state = ODEBUG_STATE_NOTAVAILABLE, + .descr = descr }; if (!debug_objects_enabled) return; @@ -425,8 +431,9 @@ void debug_object_activate(void *addr, struct debug_obj_descr *descr) * let the type specific code decide whether this is * true or not. */ - debug_object_fixup(descr->fixup_activate, addr, - ODEBUG_STATE_NOTAVAILABLE); + if (debug_object_fixup(descr->fixup_activate, addr, + ODEBUG_STATE_NOTAVAILABLE)) + debug_print_object(&o, "activate"); } /** -- 2.39.5