Messages in this thread | | | Date | Fri, 2 Jul 2010 09:29:25 +0300 | From | "Kirill A. Shutemov" <> | 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
| |