m68knommu: fix build error due to the lack of find_next_bit_le()
Akinobu Mita [Thu, 26 May 2011 23:26:05 +0000 (16:26 -0700)]
m68knommu can't build ext4, udf, and ocfs2 due to the lack of
find_next_bit_le().

This implements find_next_bit_le() on m68knommu by duplicating the generic
find_next_bit_le() in lib/find_next_bit.c.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/m68k/include/asm/bitops_no.h

index 6b0e2d3..b816299 100644 (file)
@@ -320,6 +320,50 @@ found_middle:
        return result + ffz(__swab32(tmp));
 }
 
+static inline unsigned long find_next_bit_le(const void *addr, unsigned
+               long size, unsigned long offset)
+{
+       const unsigned long *p = addr;
+       unsigned long result = offset & ~(BITS_PER_LONG - 1);
+       unsigned long tmp;
+
+       if (offset >= size)
+               return size;
+       p += offset / BITS_PER_LONG;
+       size -= result;
+       offset &= (BITS_PER_LONG - 1UL);
+       if (offset) {
+               tmp = __swab32(*(p++));
+               tmp &= (~0UL << offset);
+               if (size < BITS_PER_LONG)
+                       goto found_first;
+               if (tmp)
+                       goto found_middle;
+               size -= BITS_PER_LONG;
+               result += BITS_PER_LONG;
+       }
+
+       while (size & ~(BITS_PER_LONG - 1)) {
+               tmp = *(p++);
+               if (tmp)
+                       goto found_middle_swap;
+               result += BITS_PER_LONG;
+               size -= BITS_PER_LONG;
+       }
+       if (!size)
+               return result;
+       tmp = __swab32(*p);
+found_first:
+       tmp &= (~0UL >> (BITS_PER_LONG - size));
+       if (tmp == 0UL)         /* Are any bits set? */
+               return result + size; /* Nope. */
+found_middle:
+       return result + __ffs(tmp);
+
+found_middle_swap:
+       return result + __ffs(__swab32(tmp));
+}
+
 #endif /* __KERNEL__ */
 
 #include <asm-generic/bitops/fls.h>