m68k: introduce little-endian bitops

Introduce little-endian bit operations by renaming native ext2 bit
operations and changing find_*_bit_le() to take a "void *".  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: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>
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>

1 files changed, 67 insertions, 26 deletions

diff --git a/arch/m68k/include/asm/bitops_mm.h b/arch/m68k/include/asm/bitops_mm.h
index 31a16d47d205..d4658487defd 100644
--- a/arch/m68k/include/asm/bitops_mm.h
+++ b/arch/m68k/include/asm/bitops_mm.h
@@ -359,24 +359,45 @@ static inline int minix_test_bit(int nr, const void *vaddr)
         return (p[nr >> 4] & (1U << (nr & 15))) != 0;
 }
 
-/* Bitmap functions for the ext2 filesystem. */
+/* Bitmap functions for the little endian bitmap. */
+
+static inline void __set_bit_le(int nr, void *addr)
+{
+        __set_bit(nr ^ 24, addr);
+}
 
-#define ext2_set_bit(nr, addr)                  __test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
-#define ext2_set_bit_atomic(lock, nr, addr)     test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
-#define ext2_clear_bit(nr, addr)                __test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))
-#define ext2_clear_bit_atomic(lock, nr, addr)   test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))
-#define ext2_find_next_zero_bit(addr, size, offset) \
-        find_next_zero_bit_le((unsigned long *)addr, size, offset)
-#define ext2_find_next_bit(addr, size, offset) \
-        find_next_bit_le((unsigned long *)addr, size, offset)
+static inline void __clear_bit_le(int nr, void *addr)
+{
+        __clear_bit(nr ^ 24, addr);
+}
+
+static inline int __test_and_set_bit_le(int nr, void *addr)
+{
+        return __test_and_set_bit(nr ^ 24, addr);
+}
+
+static inline int test_and_set_bit_le(int nr, void *addr)
+{
+        return test_and_set_bit(nr ^ 24, addr);
+}
+
+static inline int __test_and_clear_bit_le(int nr, void *addr)
+{
+        return __test_and_clear_bit(nr ^ 24, addr);
+}
 
-static inline int ext2_test_bit(int nr, const void *vaddr)
+static inline int test_and_clear_bit_le(int nr, void *addr)
+{
+        return test_and_clear_bit(nr ^ 24, addr);
+}
+
+static inline int test_bit_le(int nr, const void *vaddr)
 {
         const unsigned char *p = vaddr;
         return (p[nr >> 3] & (1U << (nr & 7))) != 0;
 }
 
-static inline int ext2_find_first_zero_bit(const void *vaddr, unsigned size)
+static inline int find_first_zero_bit_le(const void *vaddr, unsigned size)
 {
         const unsigned long *p = vaddr, *addr = vaddr;
         int res;
@@ -393,33 +414,36 @@ static inline int ext2_find_first_zero_bit(const void *vaddr, unsigned size)
 
         --p;
         for (res = 0; res < 32; res++)
-                if (!ext2_test_bit (res, p))
+                if (!test_bit_le(res, p))
                         break;
         return (p - addr) * 32 + res;
 }
 
-static inline unsigned long find_next_zero_bit_le(const unsigned long *addr,
+static inline unsigned long find_next_zero_bit_le(const void *addr,
                 unsigned long size, unsigned long offset)
 {
-        const unsigned long *p = addr + (offset >> 5);
+        const unsigned long *p = addr;
         int bit = offset & 31UL, res;
 
         if (offset >= size)
                 return size;
 
+        p += offset >> 5;
+
         if (bit) {
+                offset -= bit;
                 /* Look for zero in first longword */
                 for (res = bit; res < 32; res++)
-                        if (!ext2_test_bit (res, p))
-                                return (p - addr) * 32 + res;
+                        if (!test_bit_le(res, p))
+                                return offset + res;
                 p++;
+                offset += 32;
         }
         /* No zero yet, search remaining full bytes for a zero */
-        res = ext2_find_first_zero_bit (p, size - 32 * (p - addr));
-        return (p - addr) * 32 + res;
+        return offset + find_first_zero_bit_le(p, size - offset);
 }
 
-static inline int ext2_find_first_bit(const void *vaddr, unsigned size)
+static inline int find_first_bit_le(const void *vaddr, unsigned size)
 {
         const unsigned long *p = vaddr, *addr = vaddr;
         int res;
@@ -435,32 +459,49 @@ static inline int ext2_find_first_bit(const void *vaddr, unsigned size)
 
         --p;
         for (res = 0; res < 32; res++)
-                if (ext2_test_bit(res, p))
+                if (test_bit_le(res, p))
                         break;
         return (p - addr) * 32 + res;
 }
 
-static inline unsigned long find_next_bit_le(const unsigned long *addr,
+static inline unsigned long find_next_bit_le(const void *addr,
                 unsigned long size, unsigned long offset)
 {
-        const unsigned long *p = addr + (offset >> 5);
+        const unsigned long *p = addr;
         int bit = offset & 31UL, res;
 
         if (offset >= size)
                 return size;
 
+        p += offset >> 5;
+
         if (bit) {
+                offset -= bit;
                 /* Look for one in first longword */
                 for (res = bit; res < 32; res++)
-                        if (ext2_test_bit(res, p))
-                                return (p - addr) * 32 + res;
+                        if (test_bit_le(res, p))
+                                return offset + res;
                 p++;
+                offset += 32;
         }
         /* No set bit yet, search remaining full bytes for a set bit */
-        res = ext2_find_first_bit(p, size - 32 * (p - addr));
-        return (p - addr) * 32 + res;
+        return offset + find_first_bit_le(p, size - offset);
 }
 
+/* Bitmap functions for the ext2 filesystem. */
+
+#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_find_next_zero_bit find_next_zero_bit_le
+#define ext2_find_next_bit find_next_bit_le
+#define ext2_test_bit test_bit_le
+#define ext2_find_first_zero_bit find_first_zero_bit_le
+#define ext2_find_first_bit find_first_bit_le
+
 #endif /* __KERNEL__ */
 
 #endif /* _M68K_BITOPS_H */