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Commit 302707fd authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

locking/percpu-rwsem: Export symbols for locktorture 



This commit exports percpu_down_read(), percpu_down_write(),
__percpu_init_rwsem(), percpu_up_read(), and percpu_up_write() to allow
locktorture to test them when built as a module.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
parent 095777c4

kernel/locking/percpu-rwsem.c

+5 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ int __percpu_init_rwsem(struct percpu_rw_semaphore *brw, 
	init_waitqueue_head(&brw->write_waitq);

	return 0;

}

EXPORT_SYMBOL_GPL(__percpu_init_rwsem);



void percpu_free_rwsem(struct percpu_rw_semaphore *brw)

{
@@ -87,6 +88,7 @@ void percpu_down_read(struct percpu_rw_semaphore *brw) 
	/* avoid up_read()->rwsem_release() */

	__up_read(&brw->rw_sem);

}

EXPORT_SYMBOL_GPL(percpu_down_read);



int percpu_down_read_trylock(struct percpu_rw_semaphore *brw)

{
@@ -112,6 +114,7 @@ void percpu_up_read(struct percpu_rw_semaphore *brw) 
	if (atomic_dec_and_test(&brw->slow_read_ctr))

		wake_up_all(&brw->write_waitq);

}

EXPORT_SYMBOL_GPL(percpu_up_read);



static int clear_fast_ctr(struct percpu_rw_semaphore *brw)

{
@@ -163,6 +166,7 @@ void percpu_down_write(struct percpu_rw_semaphore *brw) 
	/* wait for all readers to complete their percpu_up_read() */

	wait_event(brw->write_waitq, !atomic_read(&brw->slow_read_ctr));

}

EXPORT_SYMBOL_GPL(percpu_down_write);



void percpu_up_write(struct percpu_rw_semaphore *brw)

{
@@ -176,3 +180,4 @@ void percpu_up_write(struct percpu_rw_semaphore *brw) 
	/* the last writer unblocks update_fast_ctr() */

	atomic_dec(&brw->write_ctr);

}

EXPORT_SYMBOL_GPL(percpu_up_write);