linux-kernel - Re: [PATCH RFC 2/3] ARM: enable TTBR0/TTBR1 split in short mode

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Message-ID: <20141118180418.GN28279@e104818-lin.cambridge.arm.com>
Date:	Tue, 18 Nov 2014 18:04:19 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Konstantin Khlebnikov <k.khlebnikov@...sung.com>
Cc:	Russell King <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH RFC 2/3] ARM: enable TTBR0/TTBR1 split in short mode

On Tue, Nov 18, 2014 at 03:53:19PM +0000, Konstantin Khlebnikov wrote:
> This feature was partially implemented long time ago. All cpus load
> swapper_pg_dir into TTBR1 since commit d427958a46af24f75d0017c45eadd172273bbf33
> ("ARM: 6942/1: mm: make TTBR1 always point to swapper_pg_dir on ARMv6/7").
> But TTBRx split is never been enabled in TTBCR.

I recall there is an erratum on Cortex-A9 around the use of TTBR1 and at
the time that stopped me from pushing such change.

-- 
Catalin
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