linux-kernel - Re: [PATCH] Handle instruction cache maintenance fault properly

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Message-ID: <1273503275.10282.63.camel@e102109-lin.cambridge.arm.com>
Date:	Mon, 10 May 2010 15:54:35 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Valdis.Kletnieks@...edu
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Siarhei Siamashka <siarhei.siamashka@...ia.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Aaro Koskinen <aaro.koskinen@...ia.com>
Subject: Re: [PATCH] Handle instruction cache maintenance fault properly

On Mon, 2010-05-10 at 15:52 +0100, Valdis.Kletnieks@...edu wrote:
> On Mon, 10 May 2010 16:34:57 +0300, "Kirill A. Shutemov" said:
> 
> > It looks like cache maintenance fault was introduced in ARMv6.
> > 
> > So, what is the right way to fix it? Something like:
> > 
> > #if __LINUX_ARM_ARCH__ < 6
> >         { do_bad,               SIGBUS,  0,             "external
> 
> This would need to be a runtime test, no?  Or does LINUX_ARM_ARCH not allow
> it to run on other arch levels? (i.e. can an ARM kernel boot for v5 and v6?)

v6 and v7 probably but I doubt v5 and v6 would work. There are other
#ifdefs in arch/arm/include/asm/system.h like barriers.

-- 
Catalin

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