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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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