Commit 7ee8809d authored by Keith Busch's avatar Keith Busch Committed by Jens Axboe
Browse files

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: default avatarBart Van Assche <bvanassche@acm.org>
Signed-off-by: default avatarKeith Busch <kbusch@kernel.org>
Reviewed-by: default avatarBart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20220303201312.3255347-5-kbusch@kernel.org


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent c2ea5fcf

include/linux/kernel.h

+9 −0
Original line number Diff line number Diff line
@@ -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