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Message-ID: <swfzmcse7mm.wl%takata@linux-m32r.org>
Date: Fri, 22 Sep 2006 15:29:53 +0900
From: Hirokazu Takata <takata@...ux-m32r.org>
To: Andrew Morton <akpm@...l.org>
Cc: linux-kernel@...r.kernel.org, Matthew Wilcox <matthew@....cx>,
takata@...ux-m32r.org
Subject: [PATCH] m32r: Revise __raw_read_trylock()
Hi,
Matthew Wilcox pointed out that generic__raw_read_trylock() is
unfit for use.
Here is a patch to fix __raw_read_trylock() for m32r.
It is taken from the i386 implementation.
Signed-off-by: Hirokazu Takata <takata@...ux-m32r.org>
Cc: Matthew Wilcox <matthew@....cx>
---
include/asm-m32r/spinlock.h | 10 +++++++++-
1 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/include/asm-m32r/spinlock.h b/include/asm-m32r/spinlock.h
index f94c1a6..78205f0 100644
--- a/include/asm-m32r/spinlock.h
+++ b/include/asm-m32r/spinlock.h
@@ -298,7 +298,15 @@ #endif /* CONFIG_CHIP_M32700_TS1 */
);
}
-#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;
+ atomic_dec(count);
+ if (atomic_read(count) >= 0)
+ return 1;
+ atomic_inc(count);
+ return 0;
+}
static inline int __raw_write_trylock(raw_rwlock_t *lock)
{
--
Hirokazu Takata <takata@...ux-m32r.org>
Linux/M32R Project: http://www.linux-m32r.org/
-
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