linux-kernel - Re: [PATCH v1 4/5] mm/memory_hotplug: onlining pages can only fail due to notifiers

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Date:   Thu, 30 Aug 2018 22:30:49 +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>,
        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 4/5] mm/memory_hotplug: onlining pages can only fail
 due to notifiers

LGTM

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

On 8/16/18 6:06 AM, David Hildenbrand wrote:
> Onlining pages can only fail if a notifier reported a problem (e.g. -ENOMEM).
> online_pages_range() can never fail.
> 
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
>  mm/memory_hotplug.c | 9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 3dc6d2a309c2..bbbd16f9d877 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -933,13 +933,8 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
>  		setup_zone_pageset(zone);
>  	}
>  
> -	ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages,
> -		online_pages_range);
> -	if (ret) {
> -		if (need_zonelists_rebuild)
> -			zone_pcp_reset(zone);
> -		goto failed_addition;
> -	}
> +	walk_system_ram_range(pfn, nr_pages, &onlined_pages,
> +			      online_pages_range);
>  
>  	zone->present_pages += onlined_pages;
>  
>