linux-kernel - [PATCH] watch_queue: fix kcalloc() arguments order

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Date: Thu, 21 Dec 2023 12:01:21 +0300
From: Dmitry Antipov <dmantipov@...dex.ru>
To: David Howells <dhowells@...hat.com>
Cc: Christian Brauner <brauner@...nel.org>,
	linux-kernel@...r.kernel.org,
	Dmitry Antipov <dmantipov@...dex.ru>
Subject: [PATCH] watch_queue: fix kcalloc() arguments order

When compiling with gcc version 14.0.0 20231220 (experimental)
and W=1, I've noticed the following warning:

kernel/watch_queue.c: In function 'watch_queue_set_size':
kernel/watch_queue.c:273:32: warning: 'kcalloc' sizes specified with 'sizeof'
in the earlier argument and not in the later argument [-Wcalloc-transposed-args]
  273 |         pages = kcalloc(sizeof(struct page *), nr_pages, GFP_KERNEL);
      |                                ^~~~~~

Since 'n' and 'size' arguments of 'kcalloc()' are multiplied to
calculate the final size, their actual order doesn't affect the
result and so this is not a bug. But it's still worth to fix it.

Signed-off-by: Dmitry Antipov <dmantipov@...dex.ru>
---
 kernel/watch_queue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/watch_queue.c b/kernel/watch_queue.c
index 778b4056700f..03b90d7d2175 100644
--- a/kernel/watch_queue.c
+++ b/kernel/watch_queue.c
@@ -270,7 +270,7 @@ long watch_queue_set_size(struct pipe_inode_info *pipe, unsigned int nr_notes)
 		goto error;
 
 	ret = -ENOMEM;
-	pages = kcalloc(sizeof(struct page *), nr_pages, GFP_KERNEL);
+	pages = kcalloc(nr_pages, sizeof(struct page *), GFP_KERNEL);
 	if (!pages)
 		goto error;
 
-- 
2.43.0