From: Hirokazu Takata <takata.hirokazu@renesas.com>
Date: Wed, 27 Sep 2006 08:50:24 +0000 (-0700)
Subject: [PATCH] m32r: revise __raw_read_trylock()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=85f651794c46e8e3faf204a767d1caa7f9f278f0;p=linux-beck.git

[PATCH] m32r: revise __raw_read_trylock()

Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Cc: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/include/asm-m32r/spinlock.h b/include/asm-m32r/spinlock.h
index f94c1a673569..f9f90727a4a1 100644
--- a/include/asm-m32r/spinlock.h
+++ b/include/asm-m32r/spinlock.h
@@ -298,7 +298,14 @@ static inline void __raw_write_unlock(raw_rwlock_t *rw)
 	);
 }
 
-#define __raw_read_trylock(lock) generic__raw_read_trylock(lock)
+static inline int __raw_read_trylock(raw_rwlock_t *lock)
+{
+	atomic_t *count = (atomic_t*)lock;
+	if (atomic_dec_return(count) >= 0)
+		return 1;
+	atomic_inc(count);
+	return 0;
+}
 
 static inline int __raw_write_trylock(raw_rwlock_t *lock)
 {