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

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Message-ID: <20100702062925.GA11877@shutemov.name>
Date:	Fri, 2 Jul 2010 09:29:25 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Russell King <rmk@....linux.org.uk>
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 12:12:07AM +0100, Russell King wrote:
> 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?

In oprofile dump, I saw do_PrefetchAbort() and do_translation_fault() at
the top, so I guess IFSR is 5. I don't known value IFAR, but I'll see.

> I'm not going to be able to run your test code for
> a few days.

It's only few minutes or less if you are lucky.

-- 
 Kirill A. Shutemov
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