linux-kernel - Re: [PATCH 2/2] arm64: mm: enable CONFIG_HOLES_IN

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Date:   Fri, 16 Dec 2016 09:57:20 +0800
From:   Hanjun Guo <hanjun.guo@...aro.org>
To:     Robert Richter <robert.richter@...ium.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, will.deacon@....com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        catalin.marinas@....com, akpm@...ux-foundation.org,
        xieyisheng1@...wei.com, james.morse@....com
Subject: Re: [PATCH 2/2] arm64: mm: enable CONFIG_HOLES_IN_ZONE for NUMA

Hi Robert,

On 2016/12/15 23:39, Robert Richter wrote:
> I was going to do some measurements but my kernel crashes now with a
> page fault in efi_rtc_probe():
>
> [   21.663393] Unable to handle kernel paging request at virtual address 20251000
> [   21.663396] pgd = ffff000009090000
> [   21.663401] [20251000] *pgd=0000010ffff90003
> [   21.663402] , *pud=0000010ffff90003
> [   21.663404] , *pmd=0000000fdc030003
> [   21.663405] , *pte=00e8832000250707
>
> The sparsemem config requires the whole section to be initialized.
> Your patches do not address this.

This patch set is running properly on D05, both the boot and
LTP MM stress test are ok, seems it's a different configuration
of memory mappings in firmware, just a stupid question, which
part is related to this problem, is it only the Reserved memory?

Thanks
Hanjun