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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: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2015-08-31 20:21:59 -07:00
parent 095777c417
commit 302707fd7c
1 changed files with 5 additions and 0 deletions
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5
kernel/locking/percpu-rwsem.c
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@ -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);