[PATCH] fs : Fix warning using plain integer as NULL

[PATCH] fs : Fix warning using plain integer as NULL

[Abhinav Singh]

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@gmail.com>
---
 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

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

[Christian Brauner]

On Wed, 08 Nov 2023 10:15:50 +0530, 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.
> 
> 

Applied to the vfs.misc branch of the vfs/vfs.git tree.
Patches in the vfs.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.misc

[1/1] fs : Fix warning using plain integer as NULL
      https://git.kernel.org/vfs/vfs/c/372bfbd2ea43

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

[Jan Kara]

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@gmail.com>

Nice cleanup. Feel free to add:

Reviewed-by: Jan Kara <jack@suse.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@suse.com>
SUSE Labs, CR

[PATCH] fs : Fix warning using plain integer as NULL

[Abhinav Singh]

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@gmail.com>
Reviewed-by: Jan Kara <jack@suse.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);
-- 
2.39.2

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

[Abhinav Singh]

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@gmail.com>
> Reviewed-by: Jan Kara <jack@suse.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