linux-kernel - Re: [RFC PATCH] ARM: mach-shmobile: Parse DT to get ARCH timer memory region

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Date:   Tue, 14 May 2019 16:58:48 +0300
From:   Oleksandr <olekstysh@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Julien Grall <julien.grall@....com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Subject: Re: [RFC PATCH] ARM: mach-shmobile: Parse DT to get ARCH timer memory
 region


On 14.05.19 10:16, Geert Uytterhoeven wrote:
> Hi Oleksandr,

Hi Geert


>
> On Mon, May 13, 2019 at 6:00 PM Oleksandr <olekstysh@...il.com> wrote:
>> On 13.05.19 18:13, Geert Uytterhoeven wrote:
>>>> So, if the DT bindings for the counter module is not an option (if I
>>>> correctly understood a discussion pointed by Geert in another letter),
>>>> we should probably prevent all timer code here from being executed if
>>>> PSCI is in use.
>>>> What I mean is to return to [2], but with the modification to use
>>>> psci_smp_available() helper as an indicator of PSCI usage.
>>>>
>>>> Julien, Geert, what do you think?
>>> Yes, that sounds good to me.
>>>
>>> Note that psci_smp_available() seems to return false if CONFIG_SMP=n,
>>> so checking for that is not sufficient to avoid crashes when running a
>>> uniprocessor kernel on a PSCI-enabled system.
>> Indeed, you are right.
>>
>>
>> Nothing than just check for psci_ops.cpu_on == NULL directly comes to
>> mind...
>>
>> Have already checked with CONFIG_SMP=n, it works.
>>
>> Sounds ok?
> Fine for me, thanks!

Great, I will send new version.


>
> Gr{oetje,eeting}s,
>
>                          Geert
>
-- 
Regards,

Oleksandr Tyshchenko