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

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Date:   Tue, 13 Mar 2018 23:47:18 +0100
From:   Daniel Vacek <neelx@...hat.com>
To:     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 Tue, Mar 13, 2018 at 7:34 AM, Naresh Kamboju
<naresh.kamboju@...aro.org> wrote:
> On 12 March 2018 at 22:21, Daniel Vacek <neelx@...hat.com> wrote:
>> On Mon, Mar 12, 2018 at 3:49 PM, Naresh Kamboju
>> <naresh.kamboju@...aro.org> wrote:
>>> On 12 March 2018 at 17:56, Sudeep Holla <sudeep.holla@....com> wrote:
>>>> Hi,
>>>>
>>>> I couldn't find the exact mail corresponding to the patch merged in v4.16-rc5
>>>> but commit 864b75f9d6b01 "mm/page_alloc: fix memmap_init_zone
>>>> pageblock alignment"
>>>> cause boot hang on my ARM64 platform.
>>>
>>> I have also noticed this problem on hi6220 Hikey - arm64.
>>>
>>> LKFT: linux-next: Hikey boot failed linux-next-20180308
>>> https://bugs.linaro.org/show_bug.cgi?id=3676
>>>
>>> - Naresh
>>>
>>>>
>>>> Log:
>>>> [    0.000000] NUMA: No NUMA configuration found
>>>> [    0.000000] NUMA: Faking a node at [mem
>>>> 0x0000000000000000-0x00000009ffffffff]
>>>> [    0.000000] NUMA: NODE_DATA [mem 0x9fffcb480-0x9fffccf7f]
>>>> [    0.000000] Zone ranges:
>>>> [    0.000000]   DMA32    [mem 0x0000000080000000-0x00000000ffffffff]
>>>> [    0.000000]   Normal   [mem 0x0000000100000000-0x00000009ffffffff]
>>>> [    0.000000] Movable zone start for each node
>>>> [    0.000000] Early memory node ranges
>>>> [    0.000000]   node   0: [mem 0x0000000080000000-0x00000000f8f9afff]
>>>> [    0.000000]   node   0: [mem 0x00000000f8f9b000-0x00000000f908ffff]
>>>> [    0.000000]   node   0: [mem 0x00000000f9090000-0x00000000f914ffff]
>>>> [    0.000000]   node   0: [mem 0x00000000f9150000-0x00000000f920ffff]
>>>> [    0.000000]   node   0: [mem 0x00000000f9210000-0x00000000f922ffff]
>>>> [    0.000000]   node   0: [mem 0x00000000f9230000-0x00000000f95bffff]
>>>> [    0.000000]   node   0: [mem 0x00000000f95c0000-0x00000000fe58ffff]
>>>> [    0.000000]   node   0: [mem 0x00000000fe590000-0x00000000fe5cffff]
>>>> [    0.000000]   node   0: [mem 0x00000000fe5d0000-0x00000000fe5dffff]
>>>> [    0.000000]   node   0: [mem 0x00000000fe5e0000-0x00000000fe62ffff]
>>>> [    0.000000]   node   0: [mem 0x00000000fe630000-0x00000000feffffff]
>>>> [    0.000000]   node   0: [mem 0x0000000880000000-0x00000009ffffffff]
>>>> [    0.000000]  Initmem setup node 0 [mem 0x0000000080000000-0x00000009ffffffff]
>>>>
>>>> On Sat, Mar 3, 2018 at 1:08 AM, Daniel Vacek <neelx@...hat.com> wrote:
>>>>> On Sat, Mar 3, 2018 at 1:40 AM, Andrew Morton <akpm@...ux-foundation.org> wrote:
>>>>>>
>>>>>> This makes me wonder whether a -stable backport is really needed...
>>>>>
>>>>> For some machines it definitely is. Won't hurt either, IMHO.
>>>>>
>>>>> --nX
>>
>> Hmm, does it step back perhaps?
>>
>> Can you check if below cures 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;
>>                 }
>
> After applying this patch on linux-next the boot hang problem resolved.
> Now the hi6220-hikey is booting successfully.
> Thank you.

Thank you and Sudeep for testing. I've just sent Andrew a formal patch.

>
> - Naresh
>
>> ~~~~