Re: [PATCH v4 12/13] mips: csrc-r4k: Mark R4K timer as unstable if CPU freq changes

[Thomas Bogendoerfer <tsbogend@alpha.franken.de>]

On Thu, May 21, 2020 at 05:07:23PM +0300, Serge Semin wrote:
> Commit 07d69579e7fe ("MIPS: Don't register r4k sched clock when CPUFREQ
> enabled") disabled the r4k-clock usage for scheduler ticks counting due
> to the scheduler being non-tolerant for unstable clocks sources. For the
> same reason the clock should be used in the system clocksource framework
> with care. As soon as CPU frequency changes the clocksource framework
> should be notified about this by marking the R4K timer being unstable
> (which it really is, since the ticks rate has been changed synchronously
> with the CPU frequency).
> 
> Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
> Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: Paul Burton <paulburton@kernel.org>
> Cc: Ralf Baechle <ralf@linux-mips.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: devicetree@vger.kernel.org
> ---
>  arch/mips/Kconfig           |  1 +
>  arch/mips/kernel/csrc-r4k.c | 40 +++++++++++++++++++++++++++++++++++++
>  2 files changed, 41 insertions(+)

applied to mips-next.

Thomas.

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