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Re: [PATCH] arm64: Disallow combination of ARCH_XGENE and 16K page size

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On 28/01/16 11:08, Will Deacon wrote:
> On Thu, Jan 28, 2016 at 10:34:41AM +0000, Catalin Marinas wrote:
>> On Wed, Jan 27, 2016 at 04:10:30PM -0700, dann frazier wrote:
>>> 16K page size is an optional feature of the architecture, and is not
>>> supported by the X-Gene SoC family.

   This enables support for AppliedMicro X-Gene SOC Family
>>
>> This would be the case on Juno as well. But maybe at some point the
>> X-Gene family would gain a CPU with such support.
>>
>> Anyway, I would rather make 16K pages depend on EXPERT, make it a bit
>> harder to enable. We've had a few questions recently about enabling it
>> on CPUs that don't have such feature.
>
> I thought there was also a suggestion that we could fail gracefully in
> the EFI stub if we detected an unsupported page size?

Yes, there was. But then it was also recommended [1] to add a new stubbed function
for both arm & arm64, where it got lost. May be we should revive it.

https://lkml.org/lkml/2015/10/15/489


Thanks
Suzuki

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[PATCH] arm64: Disallow combination of ARCH_XGENE and 16K page size dann frazier <dann.frazier@canonical.com> - 2016-01-28 00:20 +0100
  Re: [PATCH] arm64: Disallow combination of ARCH_XGENE and 16K page  size Catalin Marinas <catalin.marinas@arm.com> - 2016-01-28 11:40 +0100
    Re: [PATCH] arm64: Disallow combination of ARCH_XGENE and 16K page  size Will Deacon <will.deacon@arm.com> - 2016-01-28 12:10 +0100
      Re: [PATCH] arm64: Disallow combination of ARCH_XGENE and 16K page  size "Suzuki K. Poulose" <Suzuki.Poulose@arm.com> - 2016-01-28 12:30 +0100
        Re: [PATCH] arm64: Disallow combination of ARCH_XGENE and 16K page size Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-01-28 12:40 +0100
          Re: [PATCH] arm64: Disallow combination of ARCH_XGENE and 16K page  size "Suzuki K. Poulose" <Suzuki.Poulose@arm.com> - 2016-01-28 12:40 +0100
      Re: [PATCH] arm64: Disallow combination of ARCH_XGENE and 16K page  size Mark Rutland <mark.rutland@arm.com> - 2016-01-28 12:30 +0100
        Re: [PATCH] arm64: Disallow combination of ARCH_XGENE and 16K page  size Jeremy Linton <jeremy.linton@arm.com> - 2016-01-28 16:00 +0100
  Re: [PATCH] arm64: Disallow combination of ARCH_XGENE and 16K page  size Mark Rutland <mark.rutland@arm.com> - 2016-01-28 12:30 +0100

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