Re: [PATCH] arm64: kconfig: allow support for memory failure handling

[Punit Agrawal]

On 23/03/17 14:33, James Morse wrote:
> Hi Punit,
>
> On 01/02/17 21:38, Tyler Baicar wrote:
> > From: "Jonathan (Zhixiong) Zhang" <zjzhang@xxxxxxxxxxxxxx>
> >
> > If ACPI_APEI and MEMORY_FAILURE is configured, select
> > ACPI_APEI_MEMORY_FAILURE. This enables memory failure recovery
> > when such memory failure is reported through ACPI APEI. APEI
> > (ACPI Platform Error Interfaces) provides a means for the
> > platform to convey error information to the kernel.
> >
> > Declare ARCH_SUPPORTS_MEMORY_FAILURE, as arm64 does support
> > memory failure recovery attempt.
>
> Am I right in thinking we should wait for the hugepage issue you found with
> hwpoison [0] to be fixed before arm64 can have ARCH_SUPPORTS_MEMORY_FAILURE?

We should at the least fix the huge_pte_offset() issue discovered in [0]
before we enable memory failure handling. Earlier today I posted a
RFC[1] fix for it based on Catalin's suggestion.

> (If so, can this patch become part of that series to they are obviously related!)

Good point - I can include the patches enabling memory failure handling
on ARM64 if Tyler's fine with it.

Thanks,
Punit

[1] https://lkml.org/lkml/2017/3/23/293

> Thanks,
>
> James
>
> [0] https://www.spinics.net/lists/arm-kernel/msg568995.html
>
>
>
>
> > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> > index f92778d..4cd12a0 100644
> > --- a/arch/arm64/Kconfig
> > +++ b/arch/arm64/Kconfig
> > @@ -15,6 +15,8 @@ config ARM64
> >      select ARCH_HAS_SG_CHAIN
> >      select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
> >      select ARCH_USE_CMPXCHG_LOCKREF
> > +    select ACPI_APEI_MEMORY_FAILURE if ACPI_APEI && MEMORY_FAILURE
> > +    select ARCH_SUPPORTS_MEMORY_FAILURE
> >      select ARCH_SUPPORTS_ATOMIC_RMW
> >      select ARCH_SUPPORTS_NUMA_BALANCING
> >      select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
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