linux-kernel - Re: [PATCH v2 2/6] arm64: Move kill_cpu

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Message-ID: <20151203170820.GB3527@leverpostej>
Date:	Thu, 3 Dec 2015 17:08:21 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	"Suzuki K. Poulose" <Suzuki.Poulose@....com>
Cc:	linux-arm-kernel@...ts.infradead.org, marc.zyngier@....com,
	linux-kernel@...r.kernel.org, will.deacon@....com,
	catalin.marinas@....com
Subject: Re: [PATCH v2 2/6] arm64: Move kill_cpu_early to smp.c

On Thu, Dec 03, 2015 at 04:36:51PM +0000, Suzuki K. Poulose wrote:
> On 01/12/15 18:50, Mark Rutland wrote:
> >On Tue, Dec 01, 2015 at 06:10:17PM +0000, Suzuki K. Poulose wrote:
> >>On 01/12/15 17:52, Mark Rutland wrote:
> >>>On Tue, Dec 01, 2015 at 05:38:54PM +0000, Suzuki K. Poulose wrote:
> >>>>On 01/12/15 16:31, Mark Rutland wrote:
> >>OK. So the flag will also be used for CPUs which are stuck-in-the-kernel
> >>with MMU turned on. e.g, a CPU (using spin-table) we try to bring down
> >>in kill_cpu_early(). Correct ?
> >
> >Yes.
> >
> >We'd also pad it such that nothing else shares the same writeback
> >granule, and when writing to it with the MMU off we can invalidate the
> >stale cached copy.
> 
> I have started working on this approach. But the changes are a bit more invasive
> and looks more like suited for 4.5. We could push this series(which doesn't change
> the current behavior as it is in 4.4-rc3, except for the code movement) to fix
> the ASID sanity check and introduce the synchronisation part in 4.5.
> What do you think ?

I'm happy with that. I agree this patch as-is doesn't make matters
worse.

Thanks,
Mark.
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