+#define find_first_zero_bit(addr, size) \
+ find_next_zero_bit ((addr), (size), 0)
+
+static inline int find_next_zero_bit(const void *addr, int size, int offset)
+{
+ unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
+ unsigned long result = offset & ~31UL;
+ unsigned long tmp;
+
+ if (offset >= size)
+ return size;
+ size -= result;
+ offset &= 31UL;
+ if (offset) {
+ tmp = * (p++);
+ tmp |= ~0UL >> (32-offset);
+ if (size < 32)
+ goto found_first;
+ if (~tmp)
+ goto found_middle;
+ size -= 32;
+ result += 32;
+ }
+ while (size & ~31UL) {
+ if (~ (tmp = * (p++)))
+ goto found_middle;
+ result += 32;
+ size -= 32;
+ }
+ if (!size)
+ return result;
+ tmp = *p;
+
+ found_first:
+ tmp |= ~0UL << size;
+ found_middle:
+ return result + ffz (tmp);
+}
+
+
+/* This is the same as generic_ffs, but we can't use that because it's
+ inline and the #include order mucks things up. */
+static inline int generic_ffs_for_find_next_bit(int x)
+{
+ int r = 1;
+
+ if (!x)
+ return 0;
+ if (!(x & 0xffff)) {
+ x >>= 16;
+ r += 16;
+ }
+ if (!(x & 0xff)) {
+ x >>= 8;
+ r += 8;
+ }
+ if (!(x & 0xf)) {
+ x >>= 4;
+ r += 4;
+ }
+ if (!(x & 3)) {
+ x >>= 2;
+ r += 2;
+ }
+ if (!(x & 1)) {
+ x >>= 1;
+ r += 1;
+ }
+ return r;
+}
+
+/*
+ * Find next one bit in a bitmap reasonably efficiently.
+ */
+static __inline__ unsigned long find_next_bit(const unsigned long *addr,
+ unsigned long size, unsigned long offset)
+{
+ unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
+ unsigned int result = offset & ~31UL;
+ unsigned int tmp;
+
+ if (offset >= size)
+ return size;
+ size -= result;
+ offset &= 31UL;
+ if (offset) {
+ tmp = *p++;
+ tmp &= ~0UL << offset;
+ if (size < 32)
+ goto found_first;
+ if (tmp)
+ goto found_middle;
+ size -= 32;
+ result += 32;
+ }
+ while (size >= 32) {
+ if ((tmp = *p++) != 0)
+ goto found_middle;
+ result += 32;
+ size -= 32;
+ }
+ if (!size)
+ return result;
+ tmp = *p;
+
+found_first:
+ tmp &= ~0UL >> (32 - size);
+ if (tmp == 0UL) /* Are any bits set? */
+ return result + size; /* Nope. */
+found_middle:
+ return result + generic_ffs_for_find_next_bit(tmp);
+}
+
+/*
+ * find_first_bit - find the first set bit in a memory region
+ */
+#define find_first_bit(addr, size) \
+ find_next_bit((addr), (size), 0)
+
+
+#define ffs(x) generic_ffs (x)
+#define fls(x) generic_fls (x)
+#define fls64(x) generic_fls64(x)
+#define __ffs(x) ffs(x)
+
+
+/*
+ * This is just `generic_ffs' from <linux/bitops.h>, except that it assumes
+ * that at least one bit is set, and returns the real index of the bit
+ * (rather than the bit index + 1, like ffs does).
+ */
+static inline int sched_ffs(int x)
+{
+ int r = 0;
+
+ if (!(x & 0xffff)) {
+ x >>= 16;
+ r += 16;
+ }
+ if (!(x & 0xff)) {
+ x >>= 8;
+ r += 8;
+ }
+ if (!(x & 0xf)) {
+ x >>= 4;
+ r += 4;
+ }
+ if (!(x & 3)) {
+ x >>= 2;
+ r += 2;
+ }
+ if (!(x & 1)) {
+ x >>= 1;
+ r += 1;
+ }
+ return r;
+}
+
+/*
+ * Every architecture must define this function. It's the fastest
+ * way of searching a 140-bit bitmap where the first 100 bits are
+ * unlikely to be set. It's guaranteed that at least one of the 140
+ * bits is set.
+ */
+static inline int sched_find_first_bit(unsigned long *b)
+{
+ unsigned offs = 0;
+ while (! *b) {
+ b++;
+ offs += 32;
+ }
+ return sched_ffs (*b) + offs;
+}
+
+/*
+ * hweightN: returns the hamming weight (i.e. the number
+ * of bits set) of a N-bit word
+ */
+#define hweight32(x) generic_hweight32 (x)
+#define hweight16(x) generic_hweight16 (x)
+#define hweight8(x) generic_hweight8 (x)
+
+#define ext2_set_bit test_and_set_bit