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>

arch/alpha/include/asm/bitops.h

@@ -456,8 +456,7 @@ sched_find_first_bit(const unsigned long b[2])
 
 #include <asm-generic/bitops/le.h>
 
-#define ext2_set_bit_atomic(l,n,a)   test_and_set_bit(n,a)
-#define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a)
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 
 #endif /* __KERNEL__ */
 

arch/arm/include/asm/bitops.h

@@ -310,10 +310,7 @@ static inline int find_next_bit_le(const void *p, int size, int offset)
 /*
  * Ext2 is defined to use little-endian byte ordering.
  */
-#define ext2_set_bit_atomic(lock, nr, p)	\
-		test_and_set_bit_le(nr, p)
-#define ext2_clear_bit_atomic(lock, nr, p)	\
-		test_and_clear_bit_le(nr, p)
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 
 #endif /* __KERNEL__ */
 

arch/cris/include/asm/bitops.h

@@ -156,8 +156,7 @@ static inline int test_and_change_bit(int nr, volatile unsigned long *addr)
 
 #include <asm-generic/bitops/le.h>
 
-#define ext2_set_bit_atomic(l,n,a)   test_and_set_bit(n,a)
-#define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a)
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 
 #include <asm-generic/bitops/sched.h>
 

arch/frv/include/asm/bitops.h

@@ -403,8 +403,7 @@ int __ilog2_u64(u64 n)
 
 #include <asm-generic/bitops/le.h>
 
-#define ext2_set_bit_atomic(lock,nr,addr)	test_and_set_bit  ((nr) ^ 0x18, (addr))
-#define ext2_clear_bit_atomic(lock,nr,addr)	test_and_clear_bit((nr) ^ 0x18, (addr))
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 
 #endif /* __KERNEL__ */
 

arch/ia64/include/asm/bitops.h

@@ -458,8 +458,7 @@ static __inline__ unsigned long __arch_hweight64(unsigned long x)
 
 #include <asm-generic/bitops/le.h>
 
-#define ext2_set_bit_atomic(l,n,a)	test_and_set_bit(n,a)
-#define ext2_clear_bit_atomic(l,n,a)	test_and_clear_bit(n,a)
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 
 #include <asm-generic/bitops/sched.h>
 

arch/mn10300/include/asm/bitops.h

@@ -227,12 +227,7 @@ int ffs(int x)
 #include <asm-generic/bitops/find.h>
 #include <asm-generic/bitops/sched.h>
 #include <asm-generic/bitops/hweight.h>
-
-#define ext2_set_bit_atomic(lock, nr, addr) \
-	test_and_set_bit((nr), (addr))
-#define ext2_clear_bit_atomic(lock, nr, addr) \
-	test_and_clear_bit((nr), (addr))
-
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 #include <asm-generic/bitops/le.h>
 
 #endif /* __KERNEL__ */

arch/parisc/include/asm/bitops.h

@@ -223,14 +223,7 @@ static __inline__ int fls(int x)
 #ifdef __KERNEL__
 
 #include <asm-generic/bitops/le.h>
-
-/* '3' is bits per byte */
-#define LE_BYTE_ADDR ((sizeof(unsigned long) - 1) << 3)
-
-#define ext2_set_bit_atomic(l,nr,addr) \
-		test_and_set_bit((nr)   ^ LE_BYTE_ADDR, (unsigned long *)addr)
-#define ext2_clear_bit_atomic(l,nr,addr) \
-		test_and_clear_bit( (nr) ^ LE_BYTE_ADDR, (unsigned long *)addr)
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 
 #endif	/* __KERNEL__ */
 

arch/powerpc/include/asm/bitops.h

@@ -327,10 +327,7 @@ unsigned long find_next_bit_le(const void *addr,
 				    unsigned long size, unsigned long offset);
 /* Bitmap functions for the ext2 filesystem */
 
-#define ext2_set_bit_atomic(lock, nr, addr) \
-	test_and_set_bit_le((nr), (unsigned long*)addr)
-#define ext2_clear_bit_atomic(lock, nr, addr) \
-	test_and_clear_bit_le((nr), (unsigned long*)addr)
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 
 #include <asm-generic/bitops/sched.h>
 

arch/s390/include/asm/bitops.h

@@ -832,10 +832,7 @@ static inline int find_next_bit_le(void *vaddr, unsigned long size,
 
 #include <asm-generic/bitops/le.h>
 
-#define ext2_set_bit_atomic(lock, nr, addr)	\
-	test_and_set_bit_le(nr, addr)
-#define ext2_clear_bit_atomic(lock, nr, addr)	\
-	test_and_clear_bit_le(nr, addr)
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 
 
 #endif /* __KERNEL__ */

arch/sparc/include/asm/bitops_64.h

@@ -91,10 +91,7 @@ static inline unsigned int __arch_hweight8(unsigned int w)
 
 #include <asm-generic/bitops/le.h>
 
-#define ext2_set_bit_atomic(lock,nr,addr) \
-	test_and_set_bit((nr) ^ 0x38,(unsigned long *)(addr))
-#define ext2_clear_bit_atomic(lock,nr,addr) \
-	test_and_clear_bit((nr) ^ 0x38,(unsigned long *)(addr))
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 
 #endif /* __KERNEL__ */
 

arch/tile/include/asm/bitops_64.h

@@ -97,9 +97,6 @@ static inline int test_and_change_bit(unsigned nr,
 	return (oldval & mask) != 0;
 }
 
-#define ext2_set_bit_atomic(lock, nr, addr)			\
-	test_and_set_bit((nr), (unsigned long *)(addr))
-#define ext2_clear_bit_atomic(lock, nr, addr)			\
-	test_and_clear_bit((nr), (unsigned long *)(addr))
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 
 #endif /* _ASM_TILE_BITOPS_64_H */

arch/x86/include/asm/bitops.h

@@ -458,10 +458,7 @@ static inline int fls(int x)
 
 #include <asm-generic/bitops/le.h>
 
-#define ext2_set_bit_atomic(lock, nr, addr)			\
-	test_and_set_bit((nr), (unsigned long *)(addr))
-#define ext2_clear_bit_atomic(lock, nr, addr)			\
-	test_and_clear_bit((nr), (unsigned long *)(addr))
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 
 #endif /* __KERNEL__ */
 #endif /* _ASM_X86_BITOPS_H */

arch/xtensa/include/asm/bitops.h

@@ -108,19 +108,7 @@ static inline unsigned long __fls(unsigned long word)
 #include <asm-generic/bitops/find.h>
 #include <asm-generic/bitops/le.h>
 
-#ifdef __XTENSA_EL__
-# define ext2_set_bit_atomic(lock,nr,addr)				\
-	test_and_set_bit((nr), (unsigned long*)(addr))
-# define ext2_clear_bit_atomic(lock,nr,addr)				\
-	test_and_clear_bit((nr), (unsigned long*)(addr))
-#elif defined(__XTENSA_EB__)
-# define ext2_set_bit_atomic(lock,nr,addr)				\
-	test_and_set_bit((nr) ^ 0x18, (unsigned long*)(addr))
-# define ext2_clear_bit_atomic(lock,nr,addr)				\
-	test_and_clear_bit((nr) ^ 0x18, (unsigned long*)(addr))
-#else
-# error processor byte order undefined!
-#endif
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
 
 #include <asm-generic/bitops/hweight.h>
 #include <asm-generic/bitops/lock.h>

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_ */

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;				\