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

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Date:	Wed, 25 Mar 2015 18:32:26 -0500
From:	Nishanth Menon <nm@...com>
To:	Praneeth Bajjuri <praneeth@...com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>
CC:	<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

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

-- 
Regards,
Nishanth Menon
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