ANDROID: vendor_hooks: Add hooks for rwsem and mutex

Add hooks to apply oem's optimization of rwsem and mutex

Bug: 182237112
Signed-off-by: xieliujie <xieliujie@oppo.com>
(cherry picked from commit 80b4341d05)

Signed-off-by: xieliujie <xieliujie@oppo.com>
Change-Id: I36895c432e5b6d6bff8781b4a7872badb693284c
Signed-off-by: Carlos Llamas <cmllamas@google.com>
[cmllamas: completes the cherry-pick of original commit 80b4341d05
since commit 0902cc73b793 was only partial]
(cherry picked from commit d4528a28cb5be0c322031f333a6230fa3042931f)

drivers/android/vendor_hooks.c

@@ -203,3 +203,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_set_gfp_zone_flags);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_set_readahead_gfp_mask);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alter_mutex_list_add);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mutex_unlock_slowpath);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_wake_finish);

include/trace/hooks/rwsem.h

@@ -25,6 +25,9 @@ DECLARE_HOOK(android_vh_alter_rwsem_list_add,
 		 struct rw_semaphore *sem,
 		 bool *already_on_list),
 	TP_ARGS(waiter, sem, already_on_list));
+DECLARE_HOOK(android_vh_rwsem_wake_finish,
+	TP_PROTO(struct rw_semaphore *sem),
+	TP_ARGS(sem));
 #endif /* _TRACE_HOOK_RWSEM_H */
 /* This part must be outside protection */
 #include <trace/define_trace.h>

kernel/locking/rwsem.c

@@ -1259,6 +1259,7 @@ static struct rw_semaphore *rwsem_wake(struct rw_semaphore *sem)
 
 	if (!list_empty(&sem->wait_list))
 		rwsem_mark_wake(sem, RWSEM_WAKE_ANY, &wake_q);
+	trace_android_vh_rwsem_wake_finish(sem);
 
 	raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
 	wake_up_q(&wake_q);