linux-kernel - Re: [PATCH v7 06/12] mm/hotplug: Kill is_dev_zone() usage in __remove

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Message-ID: <e5542928-de60-d83c-0e9e-f0f5961b97f3@redhat.com>
Date:   Thu, 2 May 2019 13:27:11 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Dan Williams <dan.j.williams@...el.com>, akpm@...ux-foundation.org
Cc:     Michal Hocko <mhocko@...e.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-nvdimm@...ts.01.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, osalvador@...e.de
Subject: Re: [PATCH v7 06/12] mm/hotplug: Kill is_dev_zone() usage in
 __remove_pages()

On 02.05.19 07:55, Dan Williams wrote:
> The zone type check was a leftover from the cleanup that plumbed altmap
> through the memory hotplug path, i.e. commit da024512a1fa "mm: pass the
> vmem_altmap to arch_remove_memory and __remove_pages".
> 
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Logan Gunthorpe <logang@...tatee.com>
> Cc: David Hildenbrand <david@...hat.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  mm/memory_hotplug.c |    7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 0d379da0f1a8..108380e20d8f 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -544,11 +544,8 @@ void __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
>  	unsigned long map_offset = 0;
>  	int sections_to_remove;
>  
> -	/* In the ZONE_DEVICE case device driver owns the memory region */
> -	if (is_dev_zone(zone)) {
> -		if (altmap)
> -			map_offset = vmem_altmap_offset(altmap);
> -	}
> +	if (altmap)
> +		map_offset = vmem_altmap_offset(altmap);
>  
>  	clear_zone_contiguous(zone);
>  
> 


That can be picked up independently

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 

Thanks,

David / dhildenb