linux-kernel - Re: [PATCH v1 1/5] mm/memory_hotplug: drop intermediate __offline

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Date:   Thu, 30 Aug 2018 20:17:34 +0000
From:   Pasha Tatashin <Pavel.Tatashin@...rosoft.com>
To:     David Hildenbrand <david@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Kemi Wang <kemi.wang@...el.com>,
        David Rientjes <rientjes@...gle.com>,
        Jia He <jia.he@...-semitech.com>,
        Oscar Salvador <osalvador@...e.de>,
        Petr Tesarik <ptesarik@...e.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Mathieu Malaterre <malat@...ian.org>,
        Baoquan He <bhe@...hat.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Ross Zwisler <zwisler@...nel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v1 1/5] mm/memory_hotplug: drop intermediate
 __offline_pages

I guess the wrap was done because of __ref, but no reason to have this
wrap. So looks good to me.

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

On 8/16/18 6:06 AM, David Hildenbrand wrote:
> Let's avoid this indirection and just call the function offline_pages().
> 
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
>  mm/memory_hotplug.c | 13 +++----------
>  1 file changed, 3 insertions(+), 10 deletions(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 6a2726920ed2..090cf474de87 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1589,10 +1589,10 @@ static void node_states_clear_node(int node, struct memory_notify *arg)
>  		node_clear_state(node, N_MEMORY);
>  }
>  
> -static int __ref __offline_pages(unsigned long start_pfn,
> -		  unsigned long end_pfn)
> +/* Must be protected by mem_hotplug_begin() or a device_lock */
> +int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
>  {
> -	unsigned long pfn, nr_pages;
> +	unsigned long pfn, end_pfn = start_pfn + nr_pages;
>  	long offlined_pages;
>  	int ret, node;
>  	unsigned long flags;
> @@ -1612,7 +1612,6 @@ static int __ref __offline_pages(unsigned long start_pfn,
>  
>  	zone = page_zone(pfn_to_page(valid_start));
>  	node = zone_to_nid(zone);
> -	nr_pages = end_pfn - start_pfn;
>  
>  	/* set above range as isolated */
>  	ret = start_isolate_page_range(start_pfn, end_pfn,
> @@ -1700,12 +1699,6 @@ static int __ref __offline_pages(unsigned long start_pfn,
>  	undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
>  	return ret;
>  }
> -
> -/* Must be protected by mem_hotplug_begin() or a device_lock */
> -int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
> -{
> -	return __offline_pages(start_pfn, start_pfn + nr_pages);
> -}
>  #endif /* CONFIG_MEMORY_HOTREMOVE */
>  
>  /**
>