linux-kernel - [PATCH v2 1/8] pipe: relocate round_pipe_size() above pipe_set

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Date:   Mon, 29 Aug 2016 12:20:57 +1200
From:   "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     mtk.manpages@...il.com, Willy Tarreau <w@....eu>,
        Vegard Nossum <vegard.nossum@...cle.com>, socketpair@...il.com,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Jens Axboe <axboe@...com>, Al Viro <viro@...iv.linux.org.uk>,
        linux-api@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/8] pipe: relocate round_pipe_size() above pipe_set_size()

This is a minor preparatory patch. After subsequent patches,
round_pipe_size() will be called from pipe_set_size(), so place
round_pipe_size() above pipe_set_size().

Cc: Willy Tarreau <w@....eu>
Cc: Vegard Nossum <vegard.nossum@...cle.com>
Cc: socketpair@...il.com
Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: Jens Axboe <axboe@...com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: linux-api@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Michael Kerrisk <mtk.manpages@...il.com>
---
 fs/pipe.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index 4ebe6b2..7d7c21e 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1011,6 +1011,18 @@ const struct file_operations pipefifo_fops = {
 };
 
 /*
+ * Currently we rely on the pipe array holding a power-of-2 number
+ * of pages.
+ */
+static inline unsigned int round_pipe_size(unsigned int size)
+{
+	unsigned long nr_pages;
+
+	nr_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+	return roundup_pow_of_two(nr_pages) << PAGE_SHIFT;
+}
+
+/*
  * Allocate a new array of pipe buffers and copy the info over. Returns the
  * pipe size if successful, or return -ERROR on error.
  */
@@ -1062,18 +1074,6 @@ static long pipe_set_size(struct pipe_inode_info *pipe, unsigned long nr_pages)
 }
 
 /*
- * Currently we rely on the pipe array holding a power-of-2 number
- * of pages.
- */
-static inline unsigned int round_pipe_size(unsigned int size)
-{
-	unsigned long nr_pages;
-
-	nr_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
-	return roundup_pow_of_two(nr_pages) << PAGE_SHIFT;
-}
-
-/*
  * This should work even if CONFIG_PROC_FS isn't set, as proc_dointvec_minmax
  * will return an error.
  */
-- 
2.5.5