On Thu, Jul 24, 2014 at 04:38:28PM -0400, Waiman Long wrote:
Yes, I think I may have a solution for that.Just had another look at the initial patch and it cannot be right, even
Borislav, can you apply the following patch on top of the lockdep patch to
see if it can fix the problem?
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index d24e433..507a8ce 100644
@@ -3595,6 +3595,12 @@ void lock_acquire(struct lockdep_map *lock, unsigned int
+ * An interrupt recursive read in interrupt context can be considered
+ * to be the same as a recursive read from checking perspective.
+ if ((read == 3)&& in_interrupt())
+ read = 2;
current->lockdep_recursion = 1;
trace_lock_acquire(lock, subclass, trylock, read, check, nest_lock, ip);
__lock_acquire(lock, subclass, trylock, read, check,
with the above.
The problem is you cannot use in_interrupt() in check_deadlock().
Check_deadlock() must be context invariant, it should only test the
chain state and not rely on where or when its called.