1 #include <linux/compiler.h>
2 #include <linux/types.h>
3 #include <asm/intrinsics.h>
4 #include <linux/module.h>
5 #include <linux/bitops.h>
8 * Find next zero bit in a bitmap reasonably efficiently..
11 int __find_next_zero_bit (const void *addr, unsigned long size, unsigned long offset)
13 unsigned long *p = ((unsigned long *) addr) + (offset >> 6);
14 unsigned long result = offset & ~63UL;
23 tmp |= ~0UL >> (64-offset);
31 while (size & ~63UL) {
42 if (tmp == ~0UL) /* any bits zero? */
43 return result + size; /* nope */
45 return result + ffz(tmp);
47 EXPORT_SYMBOL(__find_next_zero_bit);
50 * Find next bit in a bitmap reasonably efficiently..
52 int __find_next_bit(const void *addr, unsigned long size, unsigned long offset)
54 unsigned long *p = ((unsigned long *) addr) + (offset >> 6);
55 unsigned long result = offset & ~63UL;
64 tmp &= ~0UL << offset;
72 while (size & ~63UL) {
82 tmp &= ~0UL >> (64-size);
83 if (tmp == 0UL) /* Are any bits set? */
84 return result + size; /* Nope. */
86 return result + __ffs(tmp);
88 EXPORT_SYMBOL(__find_next_bit);