From: Akinobu Mita <mita@miraclelinux.com>
Date: Sun, 26 Mar 2006 09:39:16 +0000 (-0800)
Subject: [PATCH] bitops: generic ext2_{set,clear}_bit_atomic()
X-Git-Tag: v2.6.17-rc1~513
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=765f34fe324bdf0c0544b3404d25aaa511e3834b;p=linux-2.6

[PATCH] bitops: generic ext2_{set,clear}_bit_atomic()

This patch introduces the C-language equivalents of the functions below:

int ext2_set_bit_atomic(int nr, volatile unsigned long *addr);
int ext2_clear_bit_atomic(int nr, volatile unsigned long *addr);

In include/asm-generic/bitops/ext2-atomic.h

This code largely copied from: include/asm-sparc/bitops.h

Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/include/asm-generic/bitops/ext2-atomic.h b/include/asm-generic/bitops/ext2-atomic.h
new file mode 100644
index 0000000000..ab1c875efb
--- /dev/null
+++ b/include/asm-generic/bitops/ext2-atomic.h
@@ -0,0 +1,22 @@
+#ifndef _ASM_GENERIC_BITOPS_EXT2_ATOMIC_H_
+#define _ASM_GENERIC_BITOPS_EXT2_ATOMIC_H_
+
+#define ext2_set_bit_atomic(lock, nr, addr)		\
+	({						\
+		int ret;				\
+		spin_lock(lock);			\
+		ret = ext2_set_bit((nr), (unsigned long *)(addr)); \
+		spin_unlock(lock);			\
+		ret;					\
+	})
+
+#define ext2_clear_bit_atomic(lock, nr, addr)		\
+	({						\
+		int ret;				\
+		spin_lock(lock);			\
+		ret = ext2_clear_bit((nr), (unsigned long *)(addr)); \
+		spin_unlock(lock);			\
+		ret;					\
+	})
+
+#endif /* _ASM_GENERIC_BITOPS_EXT2_ATOMIC_H_ */