lock: Add additional lock auditing code

Keep track of lock owner name and replace lock_depth counter
with a per-cpu list of locks held by the cpu.

This allows us to print the actual locks held in case we hit
the (in)famous message about opal_pollers being run with a
lock held.

It also allows us to warn (and drop them) if locks are still
held when returning to the OS or completing a scheduled job.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
[stewart: fix unit tests]
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/core/timebase.c b/core/timebase.c
index f2dff44b..777e4ba6 100644
--- a/core/timebase.c
+++ b/core/timebase.c
@@ -53,7 +53,7 @@ void time_wait(unsigned long duration)
 {
 	struct cpu_thread *c = this_cpu();
 
-	if (this_cpu()->lock_depth) {
+	if (!list_empty(&this_cpu()->locks_held)) {
 		time_wait_nopoll(duration);
 		return;
 	}