| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ASM_GENERIC_BITOPS_SCHED_H_ |
| #define _ASM_GENERIC_BITOPS_SCHED_H_ |
| |
| #include <linux/compiler.h> /* unlikely() */ |
| #include <asm/types.h> |
| |
| /* |
| * Every architecture must define this function. It's the fastest |
| * way of searching a 100-bit bitmap. It's guaranteed that at least |
| * one of the 100 bits is cleared. |
| */ |
| static inline int sched_find_first_bit(const unsigned long *b) |
| { |
| #if BITS_PER_LONG == 64 |
| if (b[0]) |
| return __ffs(b[0]); |
| return __ffs(b[1]) + 64; |
| #elif BITS_PER_LONG == 32 |
| if (b[0]) |
| return __ffs(b[0]); |
| if (b[1]) |
| return __ffs(b[1]) + 32; |
| if (b[2]) |
| return __ffs(b[2]) + 64; |
| return __ffs(b[3]) + 96; |
| #else |
| #error BITS_PER_LONG not defined |
| #endif |
| } |
| |
| #endif /* _ASM_GENERIC_BITOPS_SCHED_H_ */ |