linux-kernel - Re: Arm64 crash while reading memory sysfs

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Date:   Fri, 28 May 2021 08:13:38 +0300
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Qian Cai <quic_qiancai@...cinc.com>,
        David Hildenbrand <david@...hat.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: Arm64 crash while reading memory sysfs

On Thu, May 27, 2021 at 03:56:44PM -0700, Andrew Morton wrote:
> On Thu, 27 May 2021 18:50:48 +0100 Catalin Marinas <catalin.marinas@....com> wrote:
> 
> > > Can you please try Anshuman's patch "arm64/mm: Drop HAVE_ARCH_PFN_VALID":
> > > 
> > > https://lore.kernel.org/lkml/1621947349-25421-1-git-send-email-anshuman.khandual@arm.com
> > > 
> > > It seems to me that the check for memblock_is_memory() in
> > > arm64::pfn_valid() is what makes init_unavailable_range() to bail out for
> > > section parts that are not actually populated and then we have
> > > VM_BUG_ON_PAGE(PagePoisoned(p)) for these pages.
> > 
> > I acked Anshuman's patch, I think they all need to go in together.
> 
> That's neat.   Specifically which patches are we referring to here?

arm64: drop pfn_valid_within() and simplify pfn_valid():
https://lore.kernel.org/lkml/20210511100550.28178-5-rppt@kernel.org

arm64/mm: Drop HAVE_ARCH_PFN_VALID:
https://lore.kernel.org/lkml/1621947349-25421-1-git-send-email-anshuman.khandual@arm.com

-- 
Sincerely yours,
Mike.