linux-kernel - [PATCH 3/4] block: mark 1st parameter of bvec_iter

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Message-Id: <1457436586-26833-4-git-send-email-ming.lei@canonical.com>
Date:	Tue,  8 Mar 2016 19:29:45 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Cc:	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Anton Altaparmakov <anton@...era.com>,
	Ming Lei <ming.lei@...onical.com>
Subject: [PATCH 3/4] block: mark 1st parameter of bvec_iter_advance as const

bvec_iter_advance() only writes to the parameter of 'iter',
so address of 'bvec' can be marked as const safely.

Without the change, we can trigger compiling warning in the
following patch for implementing iterate_bvec(): lib/iov_iter.c
with bvec iterator.

Signed-off-by: Ming Lei <ming.lei@...onical.com>
---
 include/linux/bvec_iter.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/bvec_iter.h b/include/linux/bvec_iter.h
index 07c1ffc..2ad5271 100644
--- a/include/linux/bvec_iter.h
+++ b/include/linux/bvec_iter.h
@@ -49,7 +49,8 @@
 	.bv_offset	= bvec_iter_offset((bvec), (iter)),	\
 })
 
-static inline void bvec_iter_advance(struct bio_vec *bv, struct bvec_iter *iter,
+static inline void bvec_iter_advance(const struct bio_vec *bv,
+				     struct bvec_iter *iter,
 				     unsigned bytes)
 {
 	WARN_ONCE(bytes > iter->bi_size,
-- 
1.9.1