s390: introduce little-endian bitops

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@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h
index 2e05972..f48f964 100644 (file)
--- a/arch/s390/include/asm/bitops.h
+++ b/arch/s390/include/asm/bitops.h
@@ -742,18 +742,42 @@ 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)
+static inline void __set_bit_le(unsigned long nr, void *addr)
+{
+       __set_bit(nr ^ (__BITOPS_WORDSIZE - 8), addr);
+}
+
+static inline void __clear_bit_le(unsigned long nr, void *addr)
+{
+       __clear_bit(nr ^ (__BITOPS_WORDSIZE - 8), addr);
+}
+
+static inline int __test_and_set_bit_le(unsigned long nr, void *addr)
+{
+       return __test_and_set_bit(nr ^ (__BITOPS_WORDSIZE - 8), addr);
+}
+
+static inline int test_and_set_bit_le(unsigned long nr, void *addr)
+{
+       return test_and_set_bit(nr ^ (__BITOPS_WORDSIZE - 8), addr);
+}
+
+static inline int __test_and_clear_bit_le(unsigned long nr, void *addr)
+{
+       return __test_and_clear_bit(nr ^ (__BITOPS_WORDSIZE - 8), addr);
+}
+
+static inline int test_and_clear_bit_le(unsigned long nr, void *addr)
+{
+       return test_and_clear_bit(nr ^ (__BITOPS_WORDSIZE - 8), addr);
+}
+
+static inline int test_bit_le(unsigned long nr, const void *addr)
+{
+       return test_bit(nr ^ (__BITOPS_WORDSIZE - 8), addr);
+}
+
+static inline int find_first_zero_bit_le(void *vaddr, unsigned int size)
 {
        unsigned long bytes, bits;
 
@@ -764,7 +788,7 @@ 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 +814,10 @@ 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 +828,7 @@ 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 +854,20 @@ 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>