Add percpu_down_read_trylock(), it will have the user soon.
Signed-off-by: Oleg Nesterov <o...@redhat.com>
---
include/linux/percpu-rwsem.h | 1 +
kernel/locking/percpu-rwsem.c | 13 +++++++++++++
2 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h
index 3e58226..3ebf982 100644
--- a/include/linux/percpu-rwsem.h
+++ b/include/linux/percpu-rwsem.h
@@ -17,6 +17,7 @@ struct percpu_rw_semaphore {
};
extern void percpu_down_read(struct percpu_rw_semaphore *);
+extern int percpu_down_read_trylock(struct percpu_rw_semaphore *);
extern void percpu_up_read(struct percpu_rw_semaphore *);
extern void percpu_down_write(struct percpu_rw_semaphore *);
diff --git a/kernel/locking/percpu-rwsem.c b/kernel/locking/percpu-rwsem.c
index 2c54c64..4bc2127 100644
--- a/kernel/locking/percpu-rwsem.c
+++ b/kernel/locking/percpu-rwsem.c
@@ -73,6 +73,19 @@ void percpu_down_read(struct percpu_rw_semaphore *brw)
__up_read(&brw->rw_sem);
}
+int percpu_down_read_trylock(struct percpu_rw_semaphore *brw)
+{
+ if (unlikely(!update_fast_ctr(brw, +1))) {
+ if (!__down_read_trylock(&brw->rw_sem))
+ return 0;
+ atomic_inc(&brw->slow_read_ctr);
+ __up_read(&brw->rw_sem);
+ }
+
+ rwsem_acquire_read(&brw->rw_sem.dep_map, 0, 1, _RET_IP_);
+ return 1;
+}
+
void percpu_up_read(struct percpu_rw_semaphore *brw)
{
rwsem_release(&brw->rw_sem.dep_map, 1, _RET_IP_);
--
1.5.5.1
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