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

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Date:	Fri, 27 Mar 2015 15:35:00 -0500
From:	Nishanth Menon <nm@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	Praneeth Bajjuri <praneeth@...com>, linux-omap@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: DRA7: Enable Cortex A15 errata 798181

On 03/26/2015 12:35 PM, Tony Lindgren wrote:
> * 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?
I think we can wait till 4.1

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