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 for <linuxppc-dev@lists.ozlabs.org>; Fri, 23 Jun 2017 13:09:04 +1000 (AEST)
Message-ID: <1498187343.30922.0.camel@neuling.org>
Subject: Re: [PATCH] powerpc: Invalidate ERAT on powersave wakeup for POWER9
From: Michael Neuling <mikey@neuling.org>
To: Stewart Smith <stewart@linux.vnet.ibm.com>, mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org, Nicholas Piggin <npiggin@gmail.com>
Date: Thu, 22 Jun 2017 22:09:03 -0500
In-Reply-To: <87lgojy1bk.fsf@linux.vnet.ibm.com>
References: <20170622172616.7598-1-mikey@neuling.org>
 <87lgojy1bk.fsf@linux.vnet.ibm.com>
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On Fri, 2017-06-23 at 10:50 +1000, Stewart Smith wrote:
> Michael Neuling <mikey@neuling.org> writes:
> > On POWER9 the ERAT may be incorrect on wakeup from some stop states
> > that lose state. This causes random segvs and illegal instructions
> > when these stop states are enabled.
> >=20
> > This patch invalidates the ERAT on wakeup on POWER9 to prevent this
> > from causing a problem.
> >=20
> > Signed-off-by: Michael Neuling <mikey@neuling.org>
>=20
> CC: stable?

Yes please!

Mikey