diff mbox series

[v3,2/4] mm/memory_hotplug: Drop mem_blk check from unregister_mem_sect_under_nodes

Message ID 20180815144219.6014-3-osalvador@techadventures.net (mailing list archive)
State New, archived
Headers show
Series Refactoring for remove_memory_section/unregister_mem_sect_under_nodes | expand

Commit Message

Oscar Salvador Aug. 15, 2018, 2:42 p.m. UTC 
From: Oscar Salvador <osalvador@suse.de>

Before calling to unregister_mem_sect_under_nodes(),
remove_memory_section() already checks if we got a valid memory_block.

No need to check that again in unregister_mem_sect_under_nodes().

If more functions start using unregister_mem_sect_under_nodes() in the
future, we can always place a WARN_ON to catch null mem_blk's so we can
safely back off.

For now, let us keep the check in remove_memory_section() since it is the
only function that uses it.

Signed-off-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
---
 drivers/base/node.c | 4 ----
 1 file changed, 4 deletions(-)

Comments

Pasha Tatashin Aug. 16, 2018, 5:53 p.m. UTC | #1 
On 18-08-15 16:42:17, Oscar Salvador wrote:
> From: Oscar Salvador <osalvador@suse.de>
> 
> Before calling to unregister_mem_sect_under_nodes(),
> remove_memory_section() already checks if we got a valid memory_block.
> 
> No need to check that again in unregister_mem_sect_under_nodes().
> 
> If more functions start using unregister_mem_sect_under_nodes() in the
> future, we can always place a WARN_ON to catch null mem_blk's so we can
> safely back off.
> 
> For now, let us keep the check in remove_memory_section() since it is the
> only function that uses it.
> 
> Signed-off-by: Oscar Salvador <osalvador@suse.de>
> Reviewed-by: Andrew Morton <akpm@linux-foundation.org>

Reviewed-by: Pavel Tatashin <pavel.tatashin@microsoft.com>

> ---
>  drivers/base/node.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/base/node.c b/drivers/base/node.c
> index 1ac4c36e13bb..dd3bdab230b2 100644
> --- a/drivers/base/node.c
> +++ b/drivers/base/node.c
> @@ -455,10 +455,6 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
>  	NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
>  	unsigned long pfn, sect_start_pfn, sect_end_pfn;
>  
> -	if (!mem_blk) {
> -		NODEMASK_FREE(unlinked_nodes);
> -		return -EFAULT;
> -	}
>  	if (!unlinked_nodes)
>  		return -ENOMEM;
>  	nodes_clear(*unlinked_nodes);
> -- 
> 2.13.6
>
David Hildenbrand Aug. 16, 2018, 6:43 p.m. UTC | #2 
On 15.08.2018 16:42, Oscar Salvador wrote:
> From: Oscar Salvador <osalvador@suse.de>
> 
> Before calling to unregister_mem_sect_under_nodes(),
> remove_memory_section() already checks if we got a valid memory_block.
> 
> No need to check that again in unregister_mem_sect_under_nodes().
> 
> If more functions start using unregister_mem_sect_under_nodes() in the
> future, we can always place a WARN_ON to catch null mem_blk's so we can
> safely back off.
> 
> For now, let us keep the check in remove_memory_section() since it is the
> only function that uses it.
> 
> Signed-off-by: Oscar Salvador <osalvador@suse.de>
> Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
> ---
>  drivers/base/node.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/base/node.c b/drivers/base/node.c
> index 1ac4c36e13bb..dd3bdab230b2 100644
> --- a/drivers/base/node.c
> +++ b/drivers/base/node.c
> @@ -455,10 +455,6 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
>  	NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
>  	unsigned long pfn, sect_start_pfn, sect_end_pfn;
>  
> -	if (!mem_blk) {
> -		NODEMASK_FREE(unlinked_nodes);
> -		return -EFAULT;
> -	}
>  	if (!unlinked_nodes)
>  		return -ENOMEM;
>  	nodes_clear(*unlinked_nodes);
> 

Reviewed-by: David Hildenbrand <david@redhat.com>
diff mbox series

Patch

diff --git a/drivers/base/node.c b/drivers/base/node.c
index 1ac4c36e13bb..dd3bdab230b2 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -455,10 +455,6 @@  int unregister_mem_sect_under_nodes(struct memory_block *mem_blk,
 	NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
 	unsigned long pfn, sect_start_pfn, sect_end_pfn;
 
-	if (!mem_blk) {
-		NODEMASK_FREE(unlinked_nodes);
-		return -EFAULT;
-	}
 	if (!unlinked_nodes)
 		return -ENOMEM;
 	nodes_clear(*unlinked_nodes);