linux-kernel - Re: [PATCH] fs : Fix warning using plain integer as NULL

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Date:   Wed, 8 Nov 2023 11:15:18 +0100
From:   Jan Kara <jack@...e.cz>
To:     Abhinav Singh <singhabhinav9051571833@...il.com>
Cc:     viro@...iv.linux.org.uk, brauner@...nel.org,
        dan.j.williams@...el.com, willy@...radead.org, jack@...e.cz,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        nvdimm@...ts.linux.dev,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH] fs : Fix warning using plain integer as NULL

On Wed 08-11-23 10:15:50, Abhinav Singh wrote:
> Sparse static analysis tools generate a warning with this message
> "Using plain integer as NULL pointer". In this case this warning is
> being shown because we are trying to initialize  pointer to NULL using
> integer value 0.
> 
> Signed-off-by: Abhinav Singh <singhabhinav9051571833@...il.com>

Nice cleanup. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>
								Honza

> ---
>  fs/dax.c       | 2 +-
>  fs/direct-io.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/dax.c b/fs/dax.c
> index 3380b43cb6bb..423fc1607dfa 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -1128,7 +1128,7 @@ static int dax_iomap_copy_around(loff_t pos, uint64_t length, size_t align_size,
>  	/* zero the edges if srcmap is a HOLE or IOMAP_UNWRITTEN */
>  	bool zero_edge = srcmap->flags & IOMAP_F_SHARED ||
>  			 srcmap->type == IOMAP_UNWRITTEN;
> -	void *saddr = 0;
> +	void *saddr = NULL;
>  	int ret = 0;
>  
>  	if (!zero_edge) {
> diff --git a/fs/direct-io.c b/fs/direct-io.c
> index 20533266ade6..60456263a338 100644
> --- a/fs/direct-io.c
> +++ b/fs/direct-io.c
> @@ -1114,7 +1114,7 @@ ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
>  	loff_t offset = iocb->ki_pos;
>  	const loff_t end = offset + count;
>  	struct dio *dio;
> -	struct dio_submit sdio = { 0, };
> +	struct dio_submit sdio = { NULL, };
>  	struct buffer_head map_bh = { 0, };
>  	struct blk_plug plug;
>  	unsigned long align = offset | iov_iter_alignment(iter);
> -- 
> 2.39.2
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR