linux-kernel - Re: arm: ARM_VIRT_EXT is not supported by all v7 platforms, so it should not be enabled by default

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Message-ID: <20130422104653.GA2572@mudshark.cambridge.arm.com>
Date:	Mon, 22 Apr 2013 11:46:54 +0100
From:	Will Deacon <will.deacon@....com>
To:	Sebastian Gottschall <s.gottschall@...wrt.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	marc.zyngier@....com, dave.martin@....com
Subject: Re: arm: ARM_VIRT_EXT is not supported by all v7 platforms, so it
 should not be enabled by default

On Fri, Apr 19, 2013 at 07:07:15PM +0100, Sebastian Gottschall wrote:
> introduced in kernel 3.9 CONFIG_ARM_VIRT_EXT is default for all V7 arm 
> cpu's. this is wrong and breaks smp support on BCM4708 for example.
> so keep it optional since no all v7 cpu's seem to support it. BCM4708 
> for instance is a arm cortex-a9. please merge this into one of the next 
> patches.

This was intentional, since ARM_VIRT_EXT shouldn't have any visible effect
when selected on CPUs without the virtualisation extensions.

If this is breaking SMP support, then there is a bug somewhere, so please
can elaborate on the problems which you are seeing?

Cheers,

Will
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