linux-kernel - Re: [PATCH v2 04/11] arch_topology: Reset all cpus in reset_cpu

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Message-ID: <20200414163514.00000100@flygoat.com>
Date:   Tue, 14 Apr 2020 16:35:14 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     linux-mips@...r.kernel.org, dietmar.eggemann@....com,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Robert Richter <rric@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
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        Allison Randal <allison@...utok.net>,
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Subject: Re: [PATCH v2 04/11] arch_topology: Reset all cpus in
 reset_cpu_topology

On Tue, 14 Apr 2020 09:27:34 +0100
Sudeep Holla <sudeep.holla@....com> wrote:

> On Sun, Apr 12, 2020 at 11:20:34AM +0800, Jiaxun Yang wrote:
> > For MIPS platform, when topology isn't probed by DeviceTree,
> > possible_cpu might be empty when calling init_cpu_topology,
> > that may result cpu_topology not fully reseted for all CPUs.
> > So here we can reset all cpus instead of possible cpus.
> >  
> 
> As I have told before adjust and make it default before this function
> gets called.

Hi,

That's really impossible under current MIPS code structure.

Another option would be prefill possible_cpu with all_cpu_mask before
calling topology_init, but that would make the code unnecessarily
complex.

Here simply reset the whole array won't cause any regression.

Thanks.
> 
--
Jiaxun Yang