From: u.kleine-koenig@pengutronix.de (Uwe Kleine-König)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2] [RESEND] Handle instruction cache maintenance fault properly
Date: Thu, 15 Dec 2011 22:56:49 +0100 [thread overview]
Message-ID: <20111215215649.GJ24496@pengutronix.de> (raw)
In-Reply-To: <AANLkTilVp0xvAJNns3TEe4SzEUpN8hMC9DdwmwW7i9yX@mail.gmail.com>
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@nokia.com>
> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
I found this patch in Catalin's stack that I picked up to get support
for Cortex-M3. Is this still relevant?
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-K?nig |
Industrial Linux Solutions | http://www.pengutronix.de/ |
next prev parent reply other threads:[~2011-12-15 21:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-11 10:33 [PATCH v2] [RESEND] Handle instruction cache maintenance fault properly Kirill A. Shutemov
2010-05-12 11:01 ` Catalin Marinas
2010-05-14 13:29 ` Catalin Marinas
2011-12-15 21:56 ` Uwe Kleine-König [this message]
2011-12-16 2:22 ` Kirill A. Shutemov
2011-12-16 10:01 ` Uwe Kleine-König
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