[PATCH v2] [RESEND] Handle instruction cache maintenance fault properly
Kirill A. Shutemov
kirill at shutemov.name
Thu Dec 15 21:22:05 EST 2011
On Thu, Dec 15, 2011 at 10:56:49PM +0100, Uwe Kleine-König wrote:
> Hello,
>
> On Tue, May 11, 2010 at 01:33:14PM +0300, Kirill A. Shutemov wrote:
> > Between "clean D line..." and "invalidate I line" operations in
> > v7_coherent_user_range(), the memory page may get swapped out.
> > And the fault on "invalidate I line" could not be properly handled
> > causing the oops.
> >
> > In ARMv6 "external abort on linefetch" replaced by "instruction cache
> > maintenance fault". Let's handle it as translation fault. It fixes the
> > issue.
> >
> > I'm not sure if it's reasonable to check arch version in run-time.
> > Let's do it in compile time for now.
> >
> > Signed-off-by: Siarhei Siamashka <siarhei.siamashka at nokia.com>
> > Signed-off-by: Kirill A. Shutemov <kirill at shutemov.name>
> I found this patch in Catalin's stack that I picked up to get support
> for Cortex-M3. Is this still relevant?
It's in upstream. See 8c0b742.
>
> Best regards
> Uwe
>
> > Sorry for resend. I've made mistake in maillist address.
> >
> > ---
> > arch/arm/mm/fault.c | 5 +++++
> > 1 files changed, 5 insertions(+), 0 deletions(-)
> >
> > diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
> > index 9d40c34..7f193ea 100644
> > --- a/arch/arm/mm/fault.c
> > +++ b/arch/arm/mm/fault.c
> > @@ -463,7 +463,12 @@ static struct fsr_info {
> > { do_bad, SIGILL, BUS_ADRALN, "alignment exception" },
> > { do_bad, SIGKILL, 0, "terminal exception" },
> > { do_bad, SIGILL, BUS_ADRALN, "alignment exception" },
> > +/* Do we need runtime check ? */
> > +#if __LINUX_ARM_ARCH__ < 6
> > { do_bad, SIGBUS, 0, "external abort on linefetch" },
> > +#else
> > + { do_translation_fault, SIGSEGV, SEGV_MAPPER, "I-cache maintenance
> > fault" },
> > +#endif
> > { do_translation_fault, SIGSEGV, SEGV_MAPERR, "section translation
> > fault" },
> > { do_bad, SIGBUS, 0, "external abort on linefetch" },
> > { do_page_fault, SIGSEGV, SEGV_MAPERR, "page translation fault" },
> > --
> > 1.7.0.4
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel at lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> >
>
> --
> Pengutronix e.K. | Uwe Kleine-König |
> Industrial Linux Solutions | http://www.pengutronix.de/ |
--
Kirill A. Shutemov
More information about the linux-arm-kernel
mailing list