From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 3 Feb 2005 13:34:45 +0000 (+0000)
Subject: Define __raw_read_can_lock / __raw_write_can_lock.
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e3c4807825501f0b445fe34b627669be24b59320;p=linux-beck.git

Define __raw_read_can_lock / __raw_write_can_lock.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

diff --git a/include/asm-mips/spinlock.h b/include/asm-mips/spinlock.h
index 4d0135b11156..075e9701d6bc 100644
--- a/include/asm-mips/spinlock.h
+++ b/include/asm-mips/spinlock.h
@@ -119,6 +119,18 @@ static inline unsigned int __raw_spin_trylock(raw_spinlock_t *lock)
  * read-locks.
  */
 
+/*
+ * read_can_lock - would read_trylock() succeed?
+ * @lock: the rwlock in question.
+ */
+#define __raw_read_can_lock(rw)	((rw)->lock >= 0)
+
+/*
+ * write_can_lock - would write_trylock() succeed?
+ * @lock: the rwlock in question.
+ */
+#define __raw_write_can_lock(rw)	(!(rw)->lock)
+
 static inline void __raw_read_lock(raw_rwlock_t *rw)
 {
 	unsigned int tmp;