nodemask: Drop duplicate check in for_each_node_mask()

[PATCH] nodemask: Drop duplicate check in for_each_node_mask()

Posted by Gavin Shan 2 years, 7 months ago

The return value type is changed from 'int' to 'unsigned int' since
commit 0dfe54071d7c8 ("nodemask: Fix return values to be unsigned").
Besides, the conversion between 'int' and 'unsigned int' on the
parameter @node is guaranteed to be safe due to the limited range of
MAX_NUMNODES and CONFIG_NODES_SHIFT. By the way, '(node >= 0)' should
have been '(node) >= 0' actually.

It's unnecessary to check if their return values are greater or equal
to 0 in for_each_node_mask(). Remove it.

No functional change intended.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
 include/linux/nodemask.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index bb0ee80526b2..8d07116caaf1 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -385,7 +385,7 @@ static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp,
 #if MAX_NUMNODES > 1
 #define for_each_node_mask(node, mask)				    \
 	for ((node) = first_node(mask);				    \
-	     (node >= 0) && (node) < MAX_NUMNODES;		    \
+	     (node) < MAX_NUMNODES;				    \
 	     (node) = next_node((node), (mask)))
 #else /* MAX_NUMNODES == 1 */
 #define for_each_node_mask(node, mask)                                  \
-- 
2.23.0

Re: [PATCH] nodemask: Drop duplicate check in for_each_node_mask()

Posted by Yury Norov 2 years, 6 months ago

On Tue, Jan 24, 2023 at 08:02:43AM +0800, Gavin Shan wrote:
> The return value type is changed from 'int' to 'unsigned int' since
> commit 0dfe54071d7c8 ("nodemask: Fix return values to be unsigned").
> Besides, the conversion between 'int' and 'unsigned int' on the
> parameter @node is guaranteed to be safe due to the limited range of
> MAX_NUMNODES and CONFIG_NODES_SHIFT. By the way, '(node >= 0)' should
> have been '(node) >= 0' actually.
> 
> It's unnecessary to check if their return values are greater or equal
> to 0 in for_each_node_mask(). Remove it.
> 
> No functional change intended.
> 
> Signed-off-by: Gavin Shan <gshan@redhat.com>

Applied, thanks.

Re: [PATCH] nodemask: Drop duplicate check in for_each_node_mask()

Posted by Andy Shevchenko 2 years, 7 months ago

On Tue, Jan 24, 2023 at 08:02:43AM +0800, Gavin Shan wrote:
> The return value type is changed from 'int' to 'unsigned int' since
> commit 0dfe54071d7c8 ("nodemask: Fix return values to be unsigned").
> Besides, the conversion between 'int' and 'unsigned int' on the
> parameter @node is guaranteed to be safe due to the limited range of
> MAX_NUMNODES and CONFIG_NODES_SHIFT. By the way, '(node >= 0)' should
> have been '(node) >= 0' actually.
> 
> It's unnecessary to check if their return values are greater or equal
> to 0 in for_each_node_mask(). Remove it.
> 
> No functional change intended.

Agree on the arguments.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

> Signed-off-by: Gavin Shan <gshan@redhat.com>
> ---
>  include/linux/nodemask.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
> index bb0ee80526b2..8d07116caaf1 100644
> --- a/include/linux/nodemask.h
> +++ b/include/linux/nodemask.h
> @@ -385,7 +385,7 @@ static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp,
>  #if MAX_NUMNODES > 1
>  #define for_each_node_mask(node, mask)				    \
>  	for ((node) = first_node(mask);				    \
> -	     (node >= 0) && (node) < MAX_NUMNODES;		    \
> +	     (node) < MAX_NUMNODES;				    \
>  	     (node) = next_node((node), (mask)))
>  #else /* MAX_NUMNODES == 1 */
>  #define for_each_node_mask(node, mask)                                  \
> -- 
> 2.23.0
> 

-- 
With Best Regards,
Andy Shevchenko