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Re: [PATCH] powernv: Clear SPRN_PSSCR when a POWER9 CPU comes online

From Michael Neuling <mikey@neuling.org>
Newsgroups linux.kernel
Subject Re: [PATCH] powernv: Clear SPRN_PSSCR when a POWER9 CPU comes online
Date 2016-11-23 00:40 +0100
Message-ID <sGsPo-5rk-11@gated-at.bofh.it> (permalink)
References <sGnG2-2it-9@gated-at.bofh.it> <sGsPn-5rk-3@gated-at.bofh.it>
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On Wed, 2016-11-23 at 10:30 +1100, Michael Ellerman wrote:
> "Gautham R. Shenoy" <ego@linux.vnet.ibm.com> writes:
> 
> > From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
> > 
> > Ensure that PSSCR is set to a safe value corresponding to no
> > state-loss each time a POWER9 CPU comes online.
> 
> Is this a bug fix? I can't tell from the change log.

There are no known bugs it's fixing.  

It's just safer to run with a known default value, rather than what we randomly
inherit from previous firmware.

Mikey

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Thread

[PATCH] powernv: Clear SPRN_PSSCR when a POWER9 CPU comes online "Gautham R. Shenoy" <ego@linux.vnet.ibm.com> - 2016-11-22 19:10 +0100
  Re: [PATCH] powernv: Clear SPRN_PSSCR when a POWER9 CPU comes online Michael Ellerman <mpe@ellerman.id.au> - 2016-11-23 00:40 +0100
    Re: [PATCH] powernv: Clear SPRN_PSSCR when a POWER9 CPU comes online Michael Neuling <mikey@neuling.org> - 2016-11-23 00:40 +0100
  Re: [PATCH] powernv: Clear SPRN_PSSCR when a POWER9 CPU comes online Michael Neuling <mikey@neuling.org> - 2016-11-23 01:40 +0100

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