Re: Arm64 crash while reading memory sysfs

[Mike Rapoport]

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@xxxxxxx> 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@xxxxxxx
> > > 
> > > 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@xxxxxxxxxx

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

-- 
Sincerely yours,
Mike.