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Cc:     Sudeep Holla <sudeep.holla@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
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        linux- stable <stable@vger.kernel.org>
Subject: Re: [PATCH v3 2/2] mm/page_alloc: fix memmap_init_zone pageblock
 alignment
To:     Daniel Vacek <neelx@redhat.com>,
        Naresh Kamboju <naresh.kamboju@linaro.org>
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From:   Sudeep Holla <sudeep.holla@arm.com>
Organization: ARM
Message-ID: <461ae12b-bdff-0987-3b4e-0d7dbc09b2eb@arm.com>
Date:   Mon, 12 Mar 2018 17:11:16 +0000
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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@metal:~/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