[tip:locking/core] locking/lockdep: Factor out the validate_held_lock() helper function

[tip-bot for J. R. Okajima]

Commit-ID:  e969970be033841d4c16b2e8ec8a3608347db861
Gitweb:     http://git.kernel.org/tip/e969970be033841d4c16b2e8ec8a3608347db861
Author:     J. R. Okajima <hooanon05g@xxxxxxxxx>
AuthorDate: Fri, 3 Feb 2017 01:38:16 +0900
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 16 Mar 2017 09:57:07 +0100

locking/lockdep: Factor out the validate_held_lock() helper function

Behaviour should not change.

Signed-off-by: J. R. Okajima <hooanon05g@xxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1486053497-9948-2-git-send-email-hooanon05g@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 kernel/locking/lockdep.c | 40 ++++++++++++++++++++++------------------
 1 file changed, 22 insertions(+), 18 deletions(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 0d28b82..da79548 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -3473,6 +3473,24 @@ out:
 	return ret;
 }
 
+static int reacquire_held_locks(struct task_struct *curr, unsigned int depth,
+			      int idx)
+{
+	struct held_lock *hlock;
+
+	for (hlock = curr->held_locks + idx; idx < depth; idx++, hlock++) {
+		if (!__lock_acquire(hlock->instance,
+				    hlock_class(hlock)->subclass,
+				    hlock->trylock,
+				    hlock->read, hlock->check,
+				    hlock->hardirqs_off,
+				    hlock->nest_lock, hlock->acquire_ip,
+				    hlock->references, hlock->pin_count))
+			return 1;
+	}
+	return 0;
+}
+
 static int
 __lock_set_class(struct lockdep_map *lock, const char *name,
 		 struct lock_class_key *key, unsigned int subclass,
@@ -3503,15 +3521,8 @@ __lock_set_class(struct lockdep_map *lock, const char *name,
 	curr->lockdep_depth = i;
 	curr->curr_chain_key = hlock->prev_chain_key;
 
-	for (; i < depth; i++) {
-		hlock = curr->held_locks + i;
-		if (!__lock_acquire(hlock->instance,
-			hlock_class(hlock)->subclass, hlock->trylock,
-				hlock->read, hlock->check, hlock->hardirqs_off,
-				hlock->nest_lock, hlock->acquire_ip,
-				hlock->references, hlock->pin_count))
-			return 0;
-	}
+	if (reacquire_held_locks(curr, depth, i))
+		return 0;
 
 	/*
 	 * I took it apart and put it back together again, except now I have
@@ -3582,15 +3593,8 @@ __lock_release(struct lockdep_map *lock, int nested, unsigned long ip)
 	curr->lockdep_depth = i;
 	curr->curr_chain_key = hlock->prev_chain_key;
 
-	for (i++; i < depth; i++) {
-		hlock = curr->held_locks + i;
-		if (!__lock_acquire(hlock->instance,
-			hlock_class(hlock)->subclass, hlock->trylock,
-				hlock->read, hlock->check, hlock->hardirqs_off,
-				hlock->nest_lock, hlock->acquire_ip,
-				hlock->references, hlock->pin_count))
-			return 0;
-	}
+	if (reacquire_held_locks(curr, depth, i + 1))
+		return 0;
 
 	/*
 	 * We had N bottles of beer on the wall, we drank one, but now