Because do_migrate_range() is returning nothing, some 'ret' variable
usages are unnecessary.  Remove unnecessary usage and reduce its scope.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
 mm/memory_hotplug.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6c615ba1a5c7..6df3072d11df 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1624,7 +1624,6 @@ static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
 {
 	unsigned long pfn;
 	struct page *page, *head;
-	int ret = 0;
 	LIST_HEAD(source);
 	static DEFINE_RATELIMIT_STATE(migrate_rs, DEFAULT_RATELIMIT_INTERVAL,
 				      DEFAULT_RATELIMIT_BURST);
@@ -1678,7 +1677,6 @@ static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
 						    page_is_file_lru(page));
 
 		} else {
-			ret = -EBUSY;
 			if (__ratelimit(&migrate_rs)) {
 				pr_warn("failed to isolate pfn %lx\n", pfn);
 				dump_page(page, "isolation failed");
@@ -1692,6 +1690,7 @@ static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
 			.nmask = &nmask,
 			.gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL,
 		};
+		int ret;
 
 		/*
 		 * We have checked that migration range is on a single zone so
-- 
2.25.1

On 16.02.23 00:03, SeongJae Park wrote:
> Because do_migrate_range() is returning nothing, some 'ret' variable
> usages are unnecessary.  Remove unnecessary usage and reduce its scope.
> 
> Signed-off-by: SeongJae Park <sj@kernel.org>
> ---
>   mm/memory_hotplug.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 6c615ba1a5c7..6df3072d11df 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1624,7 +1624,6 @@ static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
>   {
>   	unsigned long pfn;
>   	struct page *page, *head;
> -	int ret = 0;
>   	LIST_HEAD(source);
>   	static DEFINE_RATELIMIT_STATE(migrate_rs, DEFAULT_RATELIMIT_INTERVAL,
>   				      DEFAULT_RATELIMIT_BURST);
> @@ -1678,7 +1677,6 @@ static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
>   						    page_is_file_lru(page));
>   
>   		} else {
> -			ret = -EBUSY;
>   			if (__ratelimit(&migrate_rs)) {
>   				pr_warn("failed to isolate pfn %lx\n", pfn);
>   				dump_page(page, "isolation failed");
> @@ -1692,6 +1690,7 @@ static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
>   			.nmask = &nmask,
>   			.gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL,
>   		};
> +		int ret;
>   
>   		/*
>   		 * We have checked that migration range is on a single zone so

Please squash that into the previous patch, just calling it 
"mm/memory_hotplug: cleanup return value handling in do_migrate_range()" 
or similar.

-- 
Thanks,

David / dhildenb