linux-kernel - Re: [PATCH v1 01/11] mm/memory_hotplug: inline __offline_pages() into offline

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Date:   Wed, 19 Aug 2020 14:23:22 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        Baoquan He <bhe@...hat.com>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>,
        Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH v1 01/11] mm/memory_hotplug: inline __offline_pages()
 into offline_pages()

On Wed 19-08-20 12:11:47, David Hildenbrand wrote:
> There is only a single user, offline_pages(). Let's inline, to make
> it look more similar to online_pages().
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
> Cc: Baoquan He <bhe@...hat.com>
> Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com>
> Cc: Oscar Salvador <osalvador@...e.de>
> Signed-off-by: David Hildenbrand <david@...hat.com>

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

> ---
>  mm/memory_hotplug.c | 16 +++++-----------
>  1 file changed, 5 insertions(+), 11 deletions(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 7f62d69660e06..c781d386d87f9 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1473,11 +1473,10 @@ static int count_system_ram_pages_cb(unsigned long start_pfn,
>  	return 0;
>  }
>  
> -static int __ref __offline_pages(unsigned long start_pfn,
> -		  unsigned long end_pfn)
> +int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages)
>  {
> -	unsigned long pfn, nr_pages = 0;
> -	unsigned long offlined_pages = 0;
> +	const unsigned long end_pfn = start_pfn + nr_pages;
> +	unsigned long pfn, system_ram_pages = 0, offlined_pages = 0;
>  	int ret, node, nr_isolate_pageblock;
>  	unsigned long flags;
>  	struct zone *zone;
> @@ -1494,9 +1493,9 @@ static int __ref __offline_pages(unsigned long start_pfn,
>  	 * memory holes PG_reserved, don't need pfn_valid() checks, and can
>  	 * avoid using walk_system_ram_range() later.
>  	 */
> -	walk_system_ram_range(start_pfn, end_pfn - start_pfn, &nr_pages,
> +	walk_system_ram_range(start_pfn, nr_pages, &system_ram_pages,
>  			      count_system_ram_pages_cb);
> -	if (nr_pages != end_pfn - start_pfn) {
> +	if (system_ram_pages != nr_pages) {
>  		ret = -EINVAL;
>  		reason = "memory holes";
>  		goto failed_removal;
> @@ -1631,11 +1630,6 @@ static int __ref __offline_pages(unsigned long start_pfn,
>  	return ret;
>  }
>  
> -int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
> -{
> -	return __offline_pages(start_pfn, start_pfn + nr_pages);
> -}
> -
>  static int check_memblock_offlined_cb(struct memory_block *mem, void *arg)
>  {
>  	int ret = !is_memblock_offlined(mem);
> -- 
> 2.26.2
> 

-- 
Michal Hocko
SUSE Labs