Messages in this thread | | | Subject | Re: [PATCH v2 2/6] arm64: Move kill_cpu_early to smp.c | From | "Suzuki K. Poulose" <> | Date | Thu, 3 Dec 2015 16:36:51 +0000 |
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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 ?
Cheers Suzuki
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