You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
36 lines
897 B
36 lines
897 B
#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 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 cleared.
|
|
*/
|
|
static inline int sched_find_first_bit(const unsigned long *b)
|
|
{
|
|
#if BITS_PER_LONG == 64
|
|
if (unlikely(b[0]))
|
|
return __ffs(b[0]);
|
|
if (likely(b[1]))
|
|
return __ffs(b[1]) + 64;
|
|
return __ffs(b[2]) + 128;
|
|
#elif BITS_PER_LONG == 32
|
|
if (unlikely(b[0]))
|
|
return __ffs(b[0]);
|
|
if (unlikely(b[1]))
|
|
return __ffs(b[1]) + 32;
|
|
if (unlikely(b[2]))
|
|
return __ffs(b[2]) + 64;
|
|
if (b[3])
|
|
return __ffs(b[3]) + 96;
|
|
return __ffs(b[4]) + 128;
|
|
#else
|
|
#error BITS_PER_LONG not defined
|
|
#endif
|
|
}
|
|
|
|
#endif /* _ASM_GENERIC_BITOPS_SCHED_H_ */
|
|
|