linux-kernel - Re: [PATCH v3 2/2] mm/page_alloc: fix memmap_init

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Date:   Mon, 12 Mar 2018 17:11:16 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Daniel Vacek <neelx@...hat.com>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        open list <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Paul Burton <paul.burton@...tec.com>,
        linux- stable <stable@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] mm/page_alloc: fix memmap_init_zone pageblock
 alignment



On 12/03/18 16:51, Daniel Vacek wrote:
[...]

> 
> Hmm, does it step back perhaps?
> 
> Can you check if below cures the boot hang?
> 

Yes it does fix the boot hang.

> --nX
> 
> ~~~~
> neelx@...al:~/nX/src/linux$ git diff
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 3d974cb2a1a1..415571120bbd 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5365,8 +5365,10 @@ void __meminit memmap_init_zone(unsigned long
> size, int nid, unsigned long zone,
>                          * the valid region but still depends on correct page
>                          * metadata.
>                          */
> -                       pfn = (memblock_next_valid_pfn(pfn, end_pfn) &
> +                       unsigned long next_pfn;
> +                       next_pfn = (memblock_next_valid_pfn(pfn, end_pfn) &
>                                         ~(pageblock_nr_pages-1)) - 1;
> +                       pfn = max(next_pfn, pfn);
>  #endif
>                         continue;
>                 }
> ~~~~
> 

-- 
Regards,
Sudeep