Re: [PATCH 4/5] arm64: Verify CPU errata work arounds on hotplugged CPU

From	Will Deacon <will.deacon@arm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 4/5] arm64: Verify CPU errata work arounds on hotplugged CPU
Date	2016-04-15 16:20 +0200
Message-ID	<rocLh-4gd-27@gated-at.bofh.it> (permalink)
References	<rkTOO-33a-11@gated-at.bofh.it> <rkTOO-33a-9@gated-at.bofh.it> <rnTpg-5FL-7@gated-at.bofh.it> <rnTyY-5JF-53@gated-at.bofh.it> <rocLg-4gd-15@gated-at.bofh.it>
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On Fri, Apr 15, 2016 at 03:10:27PM +0100, Suzuki K Poulose wrote:
> On 14/04/16 18:49, Suzuki K Poulose wrote:
> >On 14/04/16 18:39, Will Deacon wrote:
> >>On Wed, Apr 06, 2016 at 12:24:13PM +0100, Suzuki K Poulose wrote:
> >>>CPU Errata work arounds are detected and applied to the
> >>>kernel code at boot time and the data is then freed up.
> >>>If a new hotplugged CPU requires a work around which
> >>>was not applied at boot time, there is nothing we can
> >>>do but simply fail the booting.
> >>
> >>Hmm, wouldn't it be better not to free the alternative text for errata
> >>workarounds instead?
> >
> >We could. I don't have a strong opinion. If there are no objections, I could
> >adopt it.
> 
> The alternatives have been merged to .init by :
> 
> commit 9aa4ec1571da6236 ("arm64: mm: fold alternatives into .init")
> 
> Mark,
> 
> Do you have any concerns on applying alternatives for CPUs turned online later ?
> We have to revert the patch above to get going

Well, note that I'm only suggesting that we keep the alternatives for
CPU errata workarounds.

Will

Thread

[PATCH 4/5] arm64: Verify CPU errata work arounds on hotplugged CPU Suzuki K Poulose <suzuki.poulose@arm.com> - 2016-04-06 13:30 +0200
  Re: [PATCH 4/5] arm64: Verify CPU errata work arounds on hotplugged  CPU Will Deacon <will.deacon@arm.com> - 2016-04-14 19:40 +0200
    Re: [PATCH 4/5] arm64: Verify CPU errata work arounds on hotplugged  CPU Suzuki K Poulose <Suzuki.Poulose@arm.com> - 2016-04-14 19:50 +0200
      Re: [PATCH 4/5] arm64: Verify CPU errata work arounds on hotplugged  CPU Suzuki K Poulose <Suzuki.Poulose@arm.com> - 2016-04-15 16:20 +0200
        Re: [PATCH 4/5] arm64: Verify CPU errata work arounds on hotplugged  CPU Will Deacon <will.deacon@arm.com> - 2016-04-15 16:20 +0200
          Re: [PATCH 4/5] arm64: Verify CPU errata work arounds on hotplugged  CPU Suzuki K Poulose <Suzuki.Poulose@arm.com> - 2016-04-18 15:50 +0200

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