linux-kernel - Re: [PATCH] btrfs: send: Silence build warning about kvcalloc()

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Date: Mon, 8 Jan 2024 18:41:47 +0100
From: David Sterba <dsterba@...e.cz>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
	David Sterba <dsterba@...e.com>, Denis Efremov <efremov@...ux.com>,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] btrfs: send: Silence build warning about kvcalloc()

On Mon, Jan 08, 2024 at 12:13:51PM +0800, Tiezhu Yang wrote:
> There exist the following warning when building kernel v6.7:
> 
>   CC      fs/btrfs/send.o
> fs/btrfs/send.c: In function ‘btrfs_ioctl_send’:
> fs/btrfs/send.c:8208:44: warning: ‘kvcalloc’ sizes specified with ‘sizeof’ in the earlier argument and not in the later argument [-Wcalloc-transposed-args]
>  8208 |         sctx->clone_roots = kvcalloc(sizeof(*sctx->clone_roots),
>       |                                            ^
> fs/btrfs/send.c:8208:44: note: earlier argument should specify number of elements, later size of each element
> 
> tested with the latest upstream toolchains (20240105):
> 
>   [fedora@...ux 6.7.test]$ gcc --version
>   gcc (GCC) 14.0.0 20240105 (experimental)
>   [fedora@...ux 6.7.test]$ as --version
>   GNU assembler (GNU Binutils) 2.41.50.20240105
>   [fedora@...ux 6.7.test]$ ld --version
>   GNU ld (GNU Binutils) 2.41.50.20240105
> 
> just switch the first and second arguments of kvcalloc() to silence
> the build warning, compile tested only.
> 
> Fixes: bae12df966f0 ("btrfs: use kvcalloc for allocation in btrfs_ioctl_send()")
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>

Thanks, a fix has been already sent
https://lore.kernel.org/linux-btrfs/20231221084748.10094-1-dmantipov@yandex.ru/