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linux/kernel: introduce lower_48_bits function

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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>
This commit is contained in:
Keith Busch 2022-03-03 12:13:08 -08:00 committed by Jens Axboe
parent c2ea5fcf53
commit 7ee8809df9
1 changed files with 9 additions and 0 deletions
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9
include/linux/kernel.h
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@ -63,6 +63,15 @@
} \
)
/**
* 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