[PATCH v5 07/27] s390: introduce little-endian bitops

[Akinobu Mita]

Introduce little-endian bit operations by renaming native ext2 bit
operations.  The ext2 bit operations are kept as wrapper macros using
little-endian bit operations to maintain bisectability until the
conversions are finished.

Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

Change from v4:
 - add casts in the macro to take any pointer types
 - drop acked-by line because enough changes has been made

The whole series is available in the git branch at:
 git://git.kernel.org/pub/scm/linux/kernel/git/mita/linux-2.6.git le-bitops-v5

 arch/s390/include/asm/bitops.h |   53 +++++++++++++++++++++++++--------------
 1 files changed, 34 insertions(+), 19 deletions(-)

diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h
index 2e05972..f47c8cf 100644
--- a/arch/s390/include/asm/bitops.h
+++ b/arch/s390/include/asm/bitops.h
@@ -742,18 +742,22 @@ static inline int sched_find_first_bit(unsigned long *b)
  *    23 22 21 20 19 18 17 16 31 30 29 28 27 26 25 24
  */
 
-#define ext2_set_bit(nr, addr)       \
-	__test_and_set_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
-#define ext2_set_bit_atomic(lock, nr, addr)       \
-	test_and_set_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
-#define ext2_clear_bit(nr, addr)     \
-	__test_and_clear_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
-#define ext2_clear_bit_atomic(lock, nr, addr)     \
-	test_and_clear_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
-#define ext2_test_bit(nr, addr)      \
-	test_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
-
-static inline int ext2_find_first_zero_bit(void *vaddr, unsigned int size)
+#define __set_bit_le(nr, addr)	\
+	__set_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)(addr))
+#define __clear_bit_le(nr, addr)	\
+	__clear_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)(addr))
+#define __test_and_set_bit_le(nr, addr)	\
+	__test_and_set_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)(addr))
+#define test_and_set_bit_le(nr, addr)	\
+	test_and_set_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)(addr))
+#define __test_and_clear_bit_le(nr, addr)	\
+	__test_and_clear_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)(addr))
+#define test_and_clear_bit_le(nr, addr)	\
+	test_and_clear_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)(addr))
+#define test_bit_le(nr, addr)	\
+	test_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)(addr))
+
+static inline int find_first_zero_bit_le(void *vaddr, unsigned int size)
 {
 	unsigned long bytes, bits;
 
@@ -764,7 +768,7 @@ static inline int ext2_find_first_zero_bit(void *vaddr, unsigned int size)
 	return (bits < size) ? bits : size;
 }
 
-static inline int ext2_find_next_zero_bit(void *vaddr, unsigned long size,
+static inline int find_next_zero_bit_le(void *vaddr, unsigned long size,
 					  unsigned long offset)
 {
         unsigned long *addr = vaddr, *p;
@@ -790,11 +794,10 @@ static inline int ext2_find_next_zero_bit(void *vaddr, unsigned long size,
 		size -= __BITOPS_WORDSIZE;
 		p++;
         }
-	return offset + ext2_find_first_zero_bit(p, size);
+	return offset + find_first_zero_bit_le(p, size);
 }
 
-static inline unsigned long ext2_find_first_bit(void *vaddr,
-						unsigned long size)
+static inline unsigned long find_first_bit_le(void *vaddr, unsigned long size)
 {
 	unsigned long bytes, bits;
 
@@ -805,7 +808,7 @@ static inline unsigned long ext2_find_first_bit(void *vaddr,
 	return (bits < size) ? bits : size;
 }
 
-static inline int ext2_find_next_bit(void *vaddr, unsigned long size,
+static inline int find_next_bit_le(void *vaddr, unsigned long size,
 				     unsigned long offset)
 {
 	unsigned long *addr = vaddr, *p;
@@ -831,8 +834,20 @@ static inline int ext2_find_next_bit(void *vaddr, unsigned long size,
 		size -= __BITOPS_WORDSIZE;
 		p++;
 	}
-	return offset + ext2_find_first_bit(p, size);
-}
+	return offset + find_first_bit_le(p, size);
+}
+
+#define ext2_set_bit __test_and_set_bit_le
+#define ext2_set_bit_atomic(lock, nr, addr)	\
+	test_and_set_bit_le(nr, addr)
+#define ext2_clear_bit __test_and_clear_bit_le
+#define ext2_clear_bit_atomic(lock, nr, addr)	\
+	test_and_clear_bit_le(nr, addr)
+#define ext2_test_bit test_bit_le
+#define ext2_find_first_zero_bit find_first_zero_bit_le
+#define ext2_find_next_zero_bit find_next_zero_bit_le
+#define ext2_find_first_bit find_first_bit_le
+#define ext2_find_next_bit find_next_bit_le
 
 #include <asm-generic/bitops/minix.h>
 
-- 
1.7.3.4

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