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| author | John Garry <john.g.garry@oracle.com> | 2025-07-11 10:52:53 +0000 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-07-17 06:01:16 -0600 |
| commit | 6381061d82141909c382811978ccdd7566698bca (patch) | |
| tree | e4b11307fdd1b8cee0878c16268862996f8e00bf /include/linux/log2.h | |
| parent | ab17ead0e0ee8650cd1cf4e481b1ed0ee9731956 (diff) | |
| download | linux-next-6381061d82141909c382811978ccdd7566698bca.tar.gz linux-next-6381061d82141909c382811978ccdd7566698bca.zip | |
ilog2: add max_pow_of_two_factor()
Relocate the function max_pow_of_two_factor() to common ilog2.h from the
xfs code, as it will be used elsewhere.
Also simplify the function, as advised by Mikulas Patocka.
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20250711105258.3135198-2-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/log2.h')
| -rw-r--r-- | include/linux/log2.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/log2.h b/include/linux/log2.h index 1366cb688a6d..2eac3fc9303d 100644 --- a/include/linux/log2.h +++ b/include/linux/log2.h @@ -255,4 +255,18 @@ int __bits_per(unsigned long n) ) : \ __bits_per(n) \ ) + +/** + * max_pow_of_two_factor - return highest power-of-2 factor + * @n: parameter + * + * find highest power-of-2 which is evenly divisible into n. + * 0 is returned for n == 0 or 1. + */ +static inline __attribute__((const)) +unsigned int max_pow_of_two_factor(unsigned int n) +{ + return n & -n; +} + #endif /* _LINUX_LOG2_H */ |