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| author | Tom Rini <trini@konsulko.com> | 2023-10-02 10:55:44 -0400 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2023-10-02 10:55:44 -0400 |
| commit | ac897385bbfa30cfdfb62ccf24acfcd4b274b2ff (patch) | |
| tree | ae567980737beb24ca24e2ee8cfeaf6eb9e26e3f /include/asm-generic/bitops/builtin-fls.h | |
| parent | 4459ed60cb1e0562bc5b40405e2b4b9bbf766d57 (diff) | |
| parent | e29b932aa07fa0226d325b35d96cd4eea0370129 (diff) | |
Merge branch 'next'
Signed-off-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'include/asm-generic/bitops/builtin-fls.h')
| -rw-r--r-- | include/asm-generic/bitops/builtin-fls.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/asm-generic/bitops/builtin-fls.h b/include/asm-generic/bitops/builtin-fls.h new file mode 100644 index 00000000000..c8455cc2884 --- /dev/null +++ b/include/asm-generic/bitops/builtin-fls.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ +#define _ASM_GENERIC_BITOPS_BUILTIN_FLS_H_ + +/** + * fls - find last (most-significant) bit set + * @x: the word to search + * + * This is defined the same way as ffs. + * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. + */ +static __always_inline int fls(unsigned int x) +{ + return x ? sizeof(x) * 8 - __builtin_clz(x) : 0; +} + +#endif |