From: Keith Busch <kbusch@kernel.org>
To: linux-nvme@lists.infradead.org, linux-block@vger.kernel.org,
linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: axboe@kernel.dk, hch@lst.de, martin.petersen@oracle.com,
Keith Busch <kbusch@kernel.org>,
Bart Van Assche <bvanassche@acm.org>
Subject: [PATCHv4 4/8] linux/kernel: introduce lower_48_bits function
Date: Thu, 3 Mar 2022 12:13:08 -0800 [thread overview]
Message-ID: <20220303201312.3255347-5-kbusch@kernel.org> (raw)
In-Reply-To: <20220303201312.3255347-1-kbusch@kernel.org>
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>
---
include/linux/kernel.h | 9 +++++++++
1 file changed, 9 insertions(+)
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
@@ -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
--
2.25.4
next prev parent reply other threads:[~2022-03-03 20:13 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-03 20:13 [PATCHv4 0/8] 64-bit data integrity field support Keith Busch
2022-03-03 20:13 ` [PATCHv4 1/8] block: support pi with extended metadata Keith Busch
2022-03-03 20:13 ` [PATCHv4 2/8] nvme: allow integrity on extended metadata formats Keith Busch
2022-03-03 20:13 ` [PATCHv4 3/8] asm-generic: introduce be48 unaligned accessors Keith Busch
2022-03-03 20:47 ` Bart Van Assche
2022-03-04 1:31 ` David Laight
2022-03-04 2:40 ` Martin K. Petersen
2022-03-04 2:56 ` Keith Busch
2022-03-03 20:13 ` Keith Busch [this message]
2022-03-03 20:48 ` [PATCHv4 4/8] linux/kernel: introduce lower_48_bits function Bart Van Assche
2022-03-03 20:13 ` [PATCHv4 5/8] lib: add rocksoft model crc64 Keith Busch
2022-03-04 2:41 ` Martin K. Petersen
2022-03-04 7:53 ` David Laight
2022-03-04 15:02 ` Keith Busch
2022-03-03 20:13 ` [PATCHv4 6/8] crypto: add rocksoft 64b crc guard tag framework Keith Busch
2022-03-08 20:21 ` Vasily Gorbik
2022-03-08 20:27 ` Keith Busch
2022-03-08 21:46 ` Keith Busch
2022-03-08 22:03 ` Vasily Gorbik
2022-03-09 4:57 ` Eric Biggers
2022-03-09 19:31 ` Keith Busch
2022-03-09 19:49 ` Eric Biggers
2022-03-10 15:39 ` Keith Busch
2022-03-10 18:36 ` Eric Biggers
2022-03-11 20:00 ` Keith Busch
2022-03-03 20:13 ` [PATCHv4 7/8] block: add pi for extended integrity Keith Busch
2022-03-04 2:41 ` Martin K. Petersen
2022-03-03 20:13 ` [PATCHv4 8/8] nvme: add support for enhanced metadata Keith Busch
2022-03-04 2:38 ` Martin K. Petersen
2022-03-07 19:34 ` [PATCHv4 0/8] 64-bit data integrity field support Keith Busch
2022-03-07 19:50 ` Jens Axboe
2022-03-07 19:50 ` Jens Axboe
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