asm-generic: add another generic ext2 atomic bitops
The majority of architectures implement ext2 atomic bitops as
test_and_{set,clear}_bit() without spinlock.
This adds this type of generic implementation in ext2-atomic-setbit.h and
use it wherever possible.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Suggested-by: Andreas Dilger <adilger@dilger.ca>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/asm-generic/bitops/ext2-atomic-setbit.h b/include/asm-generic/bitops/ext2-atomic-setbit.h
new file mode 100644
index 0000000..5a09978
--- /dev/null
+++ b/include/asm-generic/bitops/ext2-atomic-setbit.h
@@ -0,0 +1,11 @@
+#ifndef _ASM_GENERIC_BITOPS_EXT2_ATOMIC_SETBIT_H_
+#define _ASM_GENERIC_BITOPS_EXT2_ATOMIC_SETBIT_H_
+
+/*
+ * Atomic bitops based version of ext2 atomic bitops
+ */
+
+#define ext2_set_bit_atomic(l, nr, addr) test_and_set_bit_le(nr, addr)
+#define ext2_clear_bit_atomic(l, nr, addr) test_and_clear_bit_le(nr, addr)
+
+#endif /* _ASM_GENERIC_BITOPS_EXT2_ATOMIC_SETBIT_H_ */
diff --git a/include/asm-generic/bitops/ext2-atomic.h b/include/asm-generic/bitops/ext2-atomic.h
index ecf1c9d..87f0f10 100644
--- a/include/asm-generic/bitops/ext2-atomic.h
+++ b/include/asm-generic/bitops/ext2-atomic.h
@@ -1,6 +1,10 @@
#ifndef _ASM_GENERIC_BITOPS_EXT2_ATOMIC_H_
#define _ASM_GENERIC_BITOPS_EXT2_ATOMIC_H_
+/*
+ * Spinlock based version of ext2 atomic bitops
+ */
+
#define ext2_set_bit_atomic(lock, nr, addr) \
({ \
int ret; \