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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>
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