1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_GENERIC_BITOPS_SCHED_H_
3 #define _ASM_GENERIC_BITOPS_SCHED_H_
4
5 #include <linux/compiler.h> /* unlikely() */
6 #include <asm/types.h>
7
8 /*
9 * Every architecture must define this function. It's the fastest
10 * way of searching a 100-bit bitmap. It's guaranteed that at least
11 * one of the 100 bits is cleared.
12 */
13 static inline int sched_find_first_bit(const unsigned long *b)
14 {
15 #if BITS_PER_LONG == 64
16 if (b[0])
17 return __ffs(b[0]);
18 return __ffs(b[1]) + 64;
19 #elif BITS_PER_LONG == 32
20 if (b[0])
21 return __ffs(b[0]);
22 if (b[1])
23 return __ffs(b[1]) + 32;
24 if (b[2])
25 return __ffs(b[2]) + 64;
26 return __ffs(b[3]) + 96;
27 #else
28 #error BITS_PER_LONG not defined
29 #endif
30 }
31
32 #endif /* _ASM_GENERIC_BITOPS_SCHED_H_ */
33
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