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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_GENERIC_BITOPS___FFS_H_
#define _ASM_GENERIC_BITOPS___FFS_H_
#include <asm/types.h>
/**
* __ffs - find first bit in word.
* @word: The word to search
*
* Undefined if no bit exists, so code should check against 0 first.
*/
static __always_inline unsigned long __ffs(unsigned long word)
{
int num = 0;
#if BITS_PER_LONG == 64
if ((word & 0xffffffff) == 0) {
num += 32;
word >>= 32;
}
#endif
if ((word & 0xffff) == 0) {
num += 16;
word >>= 16;
}
if ((word & 0xff) == 0) {
num += 8;
word >>= 8;
}
if ((word & 0xf) == 0) {
num += 4;
word >>= 4;
}
if ((word & 0x3) == 0) {
num += 2;
word >>= 2;
}
if ((word & 0x1) == 0)
num += 1;
return num;
}
#endif /* _ASM_GENERIC_BITOPS___FFS_H_ */
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| __ffs.h | File | 777 B | 0644 |
|
| __fls.h | File | 920 B | 0644 |
|
| arch_hweight.h | File | 555 B | 0644 |
|
| atomic.h | File | 1.64 KB | 0644 |
|
| builtin-__ffs.h | File | 379 B | 0644 |
|
| builtin-__fls.h | File | 436 B | 0644 |
|
| builtin-ffs.h | File | 374 B | 0644 |
|
| builtin-fls.h | File | 412 B | 0644 |
|
| const_hweight.h | File | 1.67 KB | 0644 |
|
| ext2-atomic-setbit.h | File | 403 B | 0644 |
|
| ext2-atomic.h | File | 600 B | 0644 |
|
| ffs.h | File | 654 B | 0644 |
|
| ffz.h | File | 325 B | 0644 |
|
| fls.h | File | 683 B | 0644 |
|
| fls64.h | File | 860 B | 0644 |
|
| hweight.h | File | 254 B | 0644 |
|
| instrumented-atomic.h | File | 2.99 KB | 0644 |
|
| instrumented-lock.h | File | 2.62 KB | 0644 |
|
| instrumented-non-atomic.h | File | 4.67 KB | 0644 |
|
| le.h | File | 1.3 KB | 0644 |
|
| lock.h | File | 2.58 KB | 0644 |
|
| non-atomic.h | File | 3.86 KB | 0644 |
|
| sched.h | File | 760 B | 0644 |
|