m68knommu: 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>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>
Cc: Arnd Bergmann <arnd@arndb.de>
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>

2 files changed, 27 insertions, 14 deletions

diff --git a/arch/m68k/include/asm/bitops_no.h b/arch/m68k/include/asm/bitops_no.h
index 58c67aaf91e2..74b3f81f2e21 100644
--- a/arch/m68k/include/asm/bitops_no.h
+++ b/arch/m68k/include/asm/bitops_no.h
@@ -196,7 +196,19 @@ static __inline__ int __test_bit(int nr, const volatile unsigned long * addr)
 #include <asm-generic/bitops/hweight.h>
 #include <asm-generic/bitops/lock.h>
 
-static __inline__ int ext2_set_bit(int nr, volatile void * addr)
+#define BITOP_LE_SWIZZLE        ((BITS_PER_LONG-1) & ~0x7)
+
+static inline void __set_bit_le(int nr, void *addr)
+{
+        __set_bit(nr ^ BITOP_LE_SWIZZLE, addr);
+}
+
+static inline void __clear_bit_le(int nr, void *addr)
+{
+        __clear_bit(nr ^ BITOP_LE_SWIZZLE, addr);
+}
+
+static inline int __test_and_set_bit_le(int nr, volatile void *addr)
 {
         char retval;
 
@@ -215,7 +227,7 @@ static __inline__ int ext2_set_bit(int nr, volatile void * addr)
         return retval;
 }
 
-static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
+static inline int __test_and_clear_bit_le(int nr, volatile void *addr)
 {
         char retval;
 
@@ -238,7 +250,7 @@ static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
         ({                                              \
                 int ret;                                \
                 spin_lock(lock);                        \
-                ret = ext2_set_bit((nr), (addr));       \
+                ret = __test_and_set_bit_le((nr), (addr));      \
                 spin_unlock(lock);                      \
                 ret;                                    \
         })
@@ -247,12 +259,12 @@ static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
         ({                                              \
                 int ret;                                \
                 spin_lock(lock);                        \
-                ret = ext2_clear_bit((nr), (addr));     \
+                ret = __test_and_clear_bit_le((nr), (addr));    \
                 spin_unlock(lock);                      \
                 ret;                                    \
         })
 
-static __inline__ int ext2_test_bit(int nr, const volatile void * addr)
+static inline int test_bit_le(int nr, const volatile void *addr)
 {
         char retval;
 
@@ -271,10 +283,10 @@ static __inline__ int ext2_test_bit(int nr, const volatile void * addr)
         return retval;
 }
 
-#define ext2_find_first_zero_bit(addr, size) \
-        ext2_find_next_zero_bit((addr), (size), 0)
+#define find_first_zero_bit_le(addr, size)      \
+        find_next_zero_bit_le((addr), (size), 0)
 
-static __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
+static inline unsigned long find_next_zero_bit_le(void *addr, unsigned long size, unsigned long offset)
 {
         unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
         unsigned long result = offset & ~31UL;
@@ -324,8 +336,13 @@ found_middle:
         return result + ffz(__swab32(tmp));
 }
 
-#define ext2_find_next_bit(addr, size, off) \
-        find_next_bit_le((unsigned long *)(addr), (size), (off))
+#define ext2_set_bit __test_and_set_bit_le
+#define ext2_clear_bit __test_and_clear_bit_le
+#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_next_bit find_next_bit_le
+
 #include <asm-generic/bitops/minix.h>
 
 #endif /* __KERNEL__ */
diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index 5795f58728ca..b5424cf948e6 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -42,10 +42,6 @@ config GENERIC_FIND_NEXT_BIT
         bool
         default y
 
-config GENERIC_FIND_BIT_LE
-        bool
-        default y
-
 config GENERIC_GPIO
         bool
         default n