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