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| author | Keith Busch <kbusch@kernel.org> | 2022-03-03 12:13:08 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-03-07 12:48:35 -0700 |
| commit | 7ee8809df990d1de379002973baee1681e8d7dd3 (patch) | |
| tree | 2e1e065fd9386255e0987af616ed4c296a366ca3 /include/linux/kernel.h | |
| parent | c2ea5fcf53d5f21e6aff0de11d55bc202822df6a (diff) | |
linux/kernel: introduce lower_48_bits function
Recent data integrity field enhancements allow reference tags to be up
to 48 bits. Introduce an inline helper function since this will be a
repeated operation.
Suggested-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20220303201312.3255347-5-kbusch@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/kernel.h')
| -rw-r--r-- | include/linux/kernel.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 33f47a996513..3877478681b9 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -64,6 +64,15 @@ ) /** + * lower_48_bits() - return bits 0-47 of a number + * @n: the number we're accessing + */ +static inline u64 lower_48_bits(u64 n) +{ + return n & ((1ull << 48) - 1); +} + +/** * upper_32_bits - return bits 32-63 of a number * @n: the number we're accessing * |