| From | Keith Busch <> | Subject | [PATCHv3 04/10] linux/kernel: introduce lower_48_bits macro | Date | Tue, 22 Feb 2022 08:31:38 -0800 |
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Recent data integrity field enhancements allow 48-bit reference tags. Introduce a helper macro since this will be a repeated operation.
Suggested-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Keith Busch <kbusch@kernel.org> --- include/linux/kernel.h | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 33f47a996513..c1fa9fc2b5cd 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -63,6 +63,12 @@ } \ ) +/** + * lower_48_bits - return bits 0-47 of a number + * @n: the number we're accessing + */ +#define lower_48_bits(n) ((u64)((n) & 0xffffffffffffull)) + /** * upper_32_bits - return bits 32-63 of a number * @n: the number we're accessing -- 2.25.4
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