[PATCH 11/12] 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);

HAVE_ARCH_EXT2_ATOMIC_BITOPS is defined when the architecture has its
own
version of these functions.

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

Index: 2.6-git/include/asm-generic/bitops.h
===================================================================
--- 2.6-git.orig/include/asm-generic/bitops.h	2006-01-25 19:14:11.000000000 +0900
+++ 2.6-git/include/asm-generic/bitops.h	2006-01-25 19:14:12.000000000 +0900
@@ -645,6 +645,28 @@
 
 #endif /* HAVE_ARCH_EXT2_NON_ATOMIC_BITOPS */
 
+#ifndef HAVE_ARCH_EXT2_ATOMIC_BITOPS
+
+#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 /* HAVE_ARCH_EXT2_ATOMIC_BITOPS */
+
 #endif /* __KERNEL__ */
 
 #endif /* _ASM_GENERIC_BITOPS_H */
-
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