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

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Message-ID: <35c77f16-d01f-4dfd-96a7-2f6210e40e94@gmail.com>
Date:   Wed, 8 Nov 2023 16:20:48 +0530
From:   Abhinav Singh <singhabhinav9051571833@...il.com>
To:     viro@...iv.linux.org.uk, brauner@...nel.org,
        dan.j.williams@...el.com, willy@...radead.org, jack@...e.cz
Cc:     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 11/8/23 16:17, 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>
> Reviewed-by: Jan Kara <jack@...e.cz>
> ---
>   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);
Thanks a lot  maintainers for looking into this patch and accepting this 
patch.

BR
Abhinav