linux-kernel - Re: [PATCH] ARM: DRA7: Enable Cortex A15 errata 798181

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Date:	Thu, 26 Mar 2015 10:35:16 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Nishanth Menon <nm@...com>
Cc:	Praneeth Bajjuri <praneeth@...com>,
	Russell King <linux@....linux.org.uk>,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: DRA7: Enable Cortex A15 errata 798181

* Nishanth Menon <nm@...com> [150325 16:32]:
> On 03/25/2015 06:25 PM, Praneeth Bajjuri wrote:
> > ARM errata 798181 is applicable for OMAP5/DRA7 based devices. So enable
> > the same in the build.
> > 
> > DRA7xx is based on Cortex-A15 r2p2 revision.
> > 
> > ARM Errata extract and workaround information is as below.
> > 
> > On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
> > adequately shooting down all use of the old entries. The
> > ARM_ERRATA_798181 option enables the Linux kernel workaround
> > for this erratum which sends an IPI to the CPUs that are running
> > the same ASID as the one being invalidated.
> > 
> > Signed-off-by: Praneeth Bajjuri <praneeth@...com>
> > ---
> >  arch/arm/mach-omap2/Kconfig |    1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
> > index c7d8d86..3e4b4ae 100644
> > --- a/arch/arm/mach-omap2/Kconfig
> > +++ b/arch/arm/mach-omap2/Kconfig
> > @@ -69,6 +69,7 @@ config SOC_DRA7XX
> >  	select ARM_GIC
> >  	select HAVE_ARM_ARCH_TIMER
> >  	select IRQ_CROSSBAR
> > +	select ARM_ERRATA_798181 if SMP
> >  
> >  config ARCH_OMAP2PLUS
> >  	bool
> > 
> Gee thanks and Apologies on missing this patch.
> 
> Acked-by: Nishanth Menon <nm@...com>
> 
> Seen on DRA7 only builds, so kinda slipped radar a bit.. verified to
> apply on v4.0-rc1

Is this needed as a fix for v4.0-rc series or can this wait for v4.1?

Regards,

Tony
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