linux-kernel - [PATCH] block: move lower_48

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Date:   Sun, 27 Mar 2022 11:33:16 -0600
From:   kbusch@...nel.org
To:     linux-block@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     axboe@...nel.dk, linux-kernel@...r.kernel.org,
        Keith Busch <kbusch@...nel.org>
Subject: [PATCH] block: move lower_48_bits() to block

From: Keith Busch <kbusch@...nel.org>

The function is not generally applicable enough to be included in the core
kernel header. Move it to block since it's the only subsystem using it.

Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Keith Busch <kbusch@...nel.org>
---
 include/linux/kernel.h | 9 ---------
 include/linux/t10-pi.h | 9 +++++++++
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 08ba5995aa8b..a890428bcc1a 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -63,15 +63,6 @@
 }					\
 )
 
-/**
- * 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
diff --git a/include/linux/t10-pi.h b/include/linux/t10-pi.h
index a4b1af581f69..248f4ac95642 100644
--- a/include/linux/t10-pi.h
+++ b/include/linux/t10-pi.h
@@ -59,6 +59,15 @@ struct crc64_pi_tuple {
 	__u8   ref_tag[6];
 };
 
+/**
+ * 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);
+}
+
 static inline u64 ext_pi_ref_tag(struct request *rq)
 {
 	unsigned int shift = ilog2(queue_logical_block_size(rq->q));
-- 
2.17.2