linux-kernel - Re: [patch 071/149] ARM: 6166/1: Proper prefetch abort handling on pre-ARMv6

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Message-ID: <20100701231207.GB27389@flint.arm.linux.org.uk>
Date:	Fri, 2 Jul 2010 00:12:07 +0100
From:	Russell King <rmk@....linux.org.uk>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	g@...temov.name, Greg KH <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Anfei Zhou <anfei.zhou@...il.com>
Subject: Re: [patch 071/149] ARM: 6166/1: Proper prefetch abort handling on
	pre-ARMv6

On Fri, Jul 02, 2010 at 01:59:11AM +0300, Kirill A. Shutemov wrote:
> On Thu, Jul 01, 2010 at 11:48:37PM +0100, Russell King wrote:
> > One possibility is that for some reason you're using the legacy prefetch
> > abort code or pre-IFSR code, which will always tell the kernel that its
> > a translation fault - and in this case, this patch would improve the
> > situation.  What kernel version are you using?
> 
> 2.6.32

Should be recent enough.

> If you run this test in loop on kernel without the patch you'll finally
> get hung instead SIGSEGV.
> 
> It seems the patch fixes more than it was written for. :)

Have you investigated the IFSR and IFAR values, and the corresponding
page table state?  I'm not going to be able to run your test code for
a few days.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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