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Date:   Wed, 12 Aug 2020 18:11:25 +1000
From:   Nicholas Piggin <>
To:     Jonathan Cameron <>,
        Zefan Li <>
Cc:     Borislav Petkov <>,
 Marinas <>,
        "H. Peter Anvin" <>,,,,,,
        Ingo Molnar <>,
        Thomas Gleixner <>,
        Will Deacon <>,
Subject: Re: [PATCH v3 0/8] huge vmalloc mappings

Excerpts from Zefan Li's message of August 12, 2020 11:07 am:
> On 2020/8/12 0:32, Jonathan Cameron wrote:
>> On Mon, 10 Aug 2020 12:27:24 +1000
>> Nicholas Piggin <> wrote:
>>> Not tested on x86 or arm64, would appreciate a quick test there so I can
>>> ask Andrew to put it in -mm. Other option is I can disable huge vmallocs
>>> for them for the time being.
>> Hi Nicholas,
>> For arm64 testing with a Kunpeng920.
>> I ran a quick sanity test with this series on top of mainline (yes mid merge window
>> so who knows what state is...).  Could I be missing some dependency?
>> Without them it boots, with them it doesn't.  Any immediate guesses?
> I've already reported this bug in v2, and yeah I also tested it on arm64
> (not Kunpeng though), so looks like it still hasn't been fixed.

Huh, I thought I did fix it but seems not. vmap stacks shouldn't be 
big enough to use huge pages though, so I don't know what's going on
there. I'll dig around a bit more.

> ...
>>> Since v2:
>>> - Rebased on vmalloc cleanups, split series into simpler pieces.
>>> - Fixed several compile errors and warnings
>>> - Keep the page array and accounting in small page units because
>>>   struct vm_struct is an interface (this should fix x86 vmap stack debug
>>>   assert). [Thanks Zefan]
> though the changelog says it's fixed for x86.

Yes, my mistake that was supposed to say arm64.


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