[S390] Implement ext2_find_next_bit.

Fixes this compile error:

fs/ext4/mballoc.c:
	In function 'ext4_mb_generate_buddy':
fs/ext4/mballoc.c:954:
	error: implicit declaration of function 'generic_find_next_le_bit'

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 41 insertions, 2 deletions

diff --git a/include/asm-s390/bitops.h b/include/asm-s390/bitops.h
index 95d93955a9bb..882db054110c 100644
--- a/include/asm-s390/bitops.h
+++ b/include/asm-s390/bitops.h
@@ -790,8 +790,6 @@ static inline int sched_find_first_bit(unsigned long *b)
         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)
-#define ext2_find_next_bit(addr, size, off) \
-        generic_find_next_le_bit((unsigned long *)(addr), (size), (off))
 
 static inline int ext2_find_first_zero_bit(void *vaddr, unsigned int size)
 {
@@ -833,6 +831,47 @@ static inline int ext2_find_next_zero_bit(void *vaddr, unsigned long size,
         return offset + ext2_find_first_zero_bit(p, size);
 }
 
+static inline unsigned long ext2_find_first_bit(void *vaddr,
+                                                unsigned long size)
+{
+        unsigned long bytes, bits;
+
+        if (!size)
+                return 0;
+        bytes = __ffs_word_loop(vaddr, size);
+        bits = __ffs_word(bytes*8, __load_ulong_le(vaddr, bytes));
+        return (bits < size) ? bits : size;
+}
+
+static inline int ext2_find_next_bit(void *vaddr, unsigned long size,
+                                     unsigned long offset)
+{
+        unsigned long *addr = vaddr, *p;
+        unsigned long bit, set;
+
+        if (offset >= size)
+                return size;
+        bit = offset & (__BITOPS_WORDSIZE - 1);
+        offset -= bit;
+        size -= offset;
+        p = addr + offset / __BITOPS_WORDSIZE;
+        if (bit) {
+                /*
+                 * s390 version of ffz returns __BITOPS_WORDSIZE
+                 * if no zero bit is present in the word.
+                 */
+                set = ffs(__load_ulong_le(p, 0) >> bit) + bit;
+                if (set >= size)
+                        return size + offset;
+                if (set < __BITOPS_WORDSIZE)
+                        return set + offset;
+                offset += __BITOPS_WORDSIZE;
+                size -= __BITOPS_WORDSIZE;
+                p++;
+        }
+        return offset + ext2_find_first_bit(p, size);
+}
+
 #include <asm-generic/bitops/minix.h>
 
 #endif /* __KERNEL__ */