[PATCH] mm: memory_hotplug: Remove unnecesary check from register_page_bootmem_info_section()

[PATCH] mm: memory_hotplug: Remove unnecesary check from register_page_bootmem_info_section()

[Oscar Salvador]

When we call register_page_bootmem_info_section() having CONFIG_SPARSEMEM_VMEMMAP enabled,
we check if the pfn is valid.
This check is redundant as we already checked this in register_page_bootmem_info_node()
before calling register_page_bootmem_info_section(), so let's get rid of it.

Signed-off-by: Oscar Salvador <osalvador@techadventures.net>
---
 mm/memory_hotplug.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index d0856ab2f28d..7452a53b027f 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -200,9 +200,6 @@ static void register_page_bootmem_info_section(unsigned long start_pfn)
 	struct mem_section *ms;
 	struct page *page, *memmap;
 
-	if (!pfn_valid(start_pfn))
-		return;
-
 	section_nr = pfn_to_section_nr(start_pfn);
 	ms = __nr_to_section(section_nr);
 
-- 
2.13.5

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Re: [PATCH] mm: memory_hotplug: Remove unnecesary check from register_page_bootmem_info_section()

[Michal Hocko]

On Tue 05-12-17 15:34:22, Oscar Salvador wrote:
> When we call register_page_bootmem_info_section() having CONFIG_SPARSEMEM_VMEMMAP enabled,
> we check if the pfn is valid.
> This check is redundant as we already checked this in register_page_bootmem_info_node()
> before calling register_page_bootmem_info_section(), so let's get rid of it.

there is quite a lot of legacy and confused code in memory hotplug. Some
of it is really subtle but this one is really straightforward

> Signed-off-by: Oscar Salvador <osalvador@techadventures.net>

Acked-by: Michal Hocko <mhocko@suse.com>

> ---
>  mm/memory_hotplug.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index d0856ab2f28d..7452a53b027f 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -200,9 +200,6 @@ static void register_page_bootmem_info_section(unsigned long start_pfn)
>  	struct mem_section *ms;
>  	struct page *page, *memmap;
>  
> -	if (!pfn_valid(start_pfn))
> -		return;
> -
>  	section_nr = pfn_to_section_nr(start_pfn);
>  	ms = __nr_to_section(section_nr);
>  
> -- 
> 2.13.5
> 

-- 
Michal Hocko
SUSE Labs

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