locking/lockdep: Rename lockdep_assert_held_exclusive() -> lockdep_assert_held_write()

All callers of lockdep_assert_held_exclusive() use it to verify the
correct locking state of either a semaphore (ldisc_sem in tty,
mmap_sem for perf events, i_rwsem of inode for dax) or rwlock by
apparmor. Thus it makes sense to rename _exclusive to _write since
that's the semantics callers care. Additionally there is already
lockdep_assert_held_read(), which this new naming is more consistent with.

No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190531100651.3969-1-nborisov@suse.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/events/core.c

@@ -2179,7 +2179,7 @@ static void x86_pmu_event_mapped(struct perf_event *event, struct mm_struct *mm)
 	 * For now, this can't happen because all callers hold mmap_sem
 	 * for write.  If this changes, we'll need a different solution.
 	 */
-	lockdep_assert_held_exclusive(&mm->mmap_sem);
+	lockdep_assert_held_write(&mm->mmap_sem);
 
 	if (atomic_inc_return(&mm->context.perf_rdpmc_allowed) == 1)
 		on_each_cpu_mask(mm_cpumask(mm), refresh_pce, NULL, 1);

drivers/infiniband/core/device.c

@@ -457,7 +457,7 @@ static int alloc_name(struct ib_device *ibdev, const char *name)
 	int rc;
 	int i;
 
-	lockdep_assert_held_exclusive(&devices_rwsem);
+	lockdep_assert_held_write(&devices_rwsem);
 	ida_init(&inuse);
 	xa_for_each (&devices, index, device) {
 		char buf[IB_DEVICE_NAME_MAX];

drivers/tty/tty_ldisc.c

@@ -487,7 +487,7 @@ static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld)
 
 static void tty_ldisc_close(struct tty_struct *tty, struct tty_ldisc *ld)
 {
-	lockdep_assert_held_exclusive(&tty->ldisc_sem);
+	lockdep_assert_held_write(&tty->ldisc_sem);
 	WARN_ON(!test_bit(TTY_LDISC_OPEN, &tty->flags));
 	clear_bit(TTY_LDISC_OPEN, &tty->flags);
 	if (ld->ops->close)
@@ -509,7 +509,7 @@ static int tty_ldisc_failto(struct tty_struct *tty, int ld)
 	struct tty_ldisc *disc = tty_ldisc_get(tty, ld);
 	int r;
 
-	lockdep_assert_held_exclusive(&tty->ldisc_sem);
+	lockdep_assert_held_write(&tty->ldisc_sem);
 	if (IS_ERR(disc))
 		return PTR_ERR(disc);
 	tty->ldisc = disc;
@@ -633,7 +633,7 @@ EXPORT_SYMBOL_GPL(tty_set_ldisc);
  */
 static void tty_ldisc_kill(struct tty_struct *tty)
 {
-	lockdep_assert_held_exclusive(&tty->ldisc_sem);
+	lockdep_assert_held_write(&tty->ldisc_sem);
 	if (!tty->ldisc)
 		return;
 	/*
@@ -681,7 +681,7 @@ int tty_ldisc_reinit(struct tty_struct *tty, int disc)
 	struct tty_ldisc *ld;
 	int retval;
 
-	lockdep_assert_held_exclusive(&tty->ldisc_sem);
+	lockdep_assert_held_write(&tty->ldisc_sem);
 	ld = tty_ldisc_get(tty, disc);
 	if (IS_ERR(ld)) {
 		BUG_ON(disc == N_TTY);

fs/dax.c

@@ -1188,7 +1188,7 @@ dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
 	unsigned flags = 0;
 
 	if (iov_iter_rw(iter) == WRITE) {
-		lockdep_assert_held_exclusive(&inode->i_rwsem);
+		lockdep_assert_held_write(&inode->i_rwsem);
 		flags |= IOMAP_WRITE;
 	} else {
 		lockdep_assert_held(&inode->i_rwsem);

include/linux/lockdep.h

@@ -394,7 +394,7 @@ extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie);
 		WARN_ON(debug_locks && !lockdep_is_held(l));	\
 	} while (0)
 
-#define lockdep_assert_held_exclusive(l)	do {			\
+#define lockdep_assert_held_write(l)	do {			\
 		WARN_ON(debug_locks && !lockdep_is_held_type(l, 0));	\
 	} while (0)
 
@@ -479,7 +479,7 @@ struct lockdep_map { };
 #define lockdep_is_held_type(l, r)		(1)
 
 #define lockdep_assert_held(l)			do { (void)(l); } while (0)
-#define lockdep_assert_held_exclusive(l)	do { (void)(l); } while (0)
+#define lockdep_assert_held_write(l)	do { (void)(l); } while (0)
 #define lockdep_assert_held_read(l)		do { (void)(l); } while (0)
 #define lockdep_assert_held_once(l)		do { (void)(l); } while (0)
 

security/apparmor/label.c

@@ -76,7 +76,7 @@ void __aa_proxy_redirect(struct aa_label *orig, struct aa_label *new)
 
 	AA_BUG(!orig);
 	AA_BUG(!new);
-	lockdep_assert_held_exclusive(&labels_set(orig)->lock);
+	lockdep_assert_held_write(&labels_set(orig)->lock);
 
 	tmp = rcu_dereference_protected(orig->proxy->label,
 					&labels_ns(orig)->lock);
@@ -566,7 +566,7 @@ static bool __label_remove(struct aa_label *label, struct aa_label *new)
 
 	AA_BUG(!ls);
 	AA_BUG(!label);
-	lockdep_assert_held_exclusive(&ls->lock);
+	lockdep_assert_held_write(&ls->lock);
 
 	if (new)
 		__aa_proxy_redirect(label, new);
@@ -603,7 +603,7 @@ static bool __label_replace(struct aa_label *old, struct aa_label *new)
 	AA_BUG(!ls);
 	AA_BUG(!old);
 	AA_BUG(!new);
-	lockdep_assert_held_exclusive(&ls->lock);
+	lockdep_assert_held_write(&ls->lock);
 	AA_BUG(new->flags & FLAG_IN_TREE);
 
 	if (!label_is_stale(old))
@@ -640,7 +640,7 @@ static struct aa_label *__label_insert(struct aa_labelset *ls,
 	AA_BUG(!ls);
 	AA_BUG(!label);
 	AA_BUG(labels_set(label) != ls);
-	lockdep_assert_held_exclusive(&ls->lock);
+	lockdep_assert_held_write(&ls->lock);
 	AA_BUG(label->flags & FLAG_IN_TREE);
 
 	/* Figure out where to put new node */