From bc8846c522264d2522b0082321ec8c2051a4536f Mon Sep 17 00:00:00 2001
From: Kyle McMartin <kyle@parisc-linux.org>
Date: Fri, 24 Mar 2006 21:22:02 -0700
Subject: [PATCH] [PARISC] More useful readwrite lock helpers
spinlock.c needs _can_lock helpers. Rewrite _is_locked helpers to be
_can_lock helpers.
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
---
include/asm-parisc/spinlock.h | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/include/asm-parisc/spinlock.h b/include/asm-parisc/spinlock.h
index 16c2ac075fc52..a93960e232cff 100644
--- a/include/asm-parisc/spinlock.h
+++ b/include/asm-parisc/spinlock.h
@@ -134,14 +134,22 @@ static __inline__ int __raw_write_trylock(raw_rwlock_t *rw)
return 1;
}
-static __inline__ int __raw_is_read_locked(raw_rwlock_t *rw)
+/*
+ * read_can_lock - would read_trylock() succeed?
+ * @lock: the rwlock in question.
+ */
+static __inline__ int __raw_read_can_lock(raw_rwlock_t *rw)
{
- return rw->counter > 0;
+ return rw->counter >= 0;
}
-static __inline__ int __raw_is_write_locked(raw_rwlock_t *rw)
+/*
+ * write_can_lock - would write_trylock() succeed?
+ * @lock: the rwlock in question.
+ */
+static __inline__ int __raw_write_can_lock(raw_rwlock_t *rw)
{
- return rw->counter < 0;
+ return !rw->counter;
}
#endif /* __ASM_SPINLOCK_H */
--
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