lockdep: Print a nicer description for simple deadlocks
authorSteven Rostedt <srostedt@redhat.com>
Thu, 21 Apr 2011 01:41:56 +0000 (21:41 -0400)
committerIngo Molnar <mingo@elte.hu>
Fri, 22 Apr 2011 09:06:58 +0000 (11:06 +0200)
commit48702ecf308e53f176c1f6fdc193d622ded54ac0
treeaa348b35b3a97fd9a5230e145ea4e6186ab2a978
parentf4185812aa046ecb97e8817e10148cacdd7a6baa
lockdep: Print a nicer description for simple deadlocks

Lockdep output can be pretty cryptic, having nicer output
can save a lot of head scratching. When a simple deadlock
scenario is detected by lockdep (lock A -> lock A) we now
get the following new output:

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&(lock)->rlock);
  lock(&(lock)->rlock);

 *** DEADLOCK ***

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20110421014259.643930104@goodmis.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/lockdep.c