From: catalin.marinas@arm.com (Catalin Marinas)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2] ARM: Do not run dummy_flush_tlb_a15_erratum() on non-Cortex-A15
Date: Tue, 23 Jul 2013 14:08:37 +0100 [thread overview]
Message-ID: <20130723130837.GA4654@MacBook-Pro.local> (raw)
In-Reply-To: <1374581199-8277-1-git-send-email-festevam@gmail.com>
On Tue, Jul 23, 2013 at 01:06:39PM +0100, Fabio Estevam wrote:
> From: Fabio Estevam <fabio.estevam@freescale.com>
>
> Commit 93dc688 (ARM: 7684/1: errata: Workaround for Cortex-A15 erratum 798181
> (TLBI/DSB operations)) causes the following undefined instruction error on a
> mx53 (Cortex-A8):
>
> Internal error: Oops - undefined instruction: 0 [#1] SMP ARM
> CPU: 0 PID: 275 Comm: modprobe Not tainted 3.11.0-rc2-next-20130722-00009-g9b0f371 #881
> task: df46cc00 ti: df48e000 task.ti: df48e000
> PC is at check_and_switch_context+0x17c/0x4d0
> LR is at check_and_switch_context+0xdc/0x4d0
>
> This problem happens because check_and_switch_context() calls
> dummy_flush_tlb_a15_erratum() without checking if we are really running on a
> Cortex-A15 or not.
>
> To avoid this issue, only call dummy_flush_tlb_a15_erratum() inside
> check_and_switch_context() if erratum_a15_798181() returns true, which means
> that we are really running on a Cortex-A15.
>
> Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2013-07-23 13:08 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-23 12:06 [PATCH v2] ARM: Do not run dummy_flush_tlb_a15_erratum() on non-Cortex-A15 Fabio Estevam
2013-07-23 13:08 ` Catalin Marinas [this message]
2013-07-23 14:04 ` Roger Quadros
2013-07-24 17:00 ` Paul Walmsley
2013-08-01 4:03 ` Rob Herring
2013-08-01 10:58 ` Russell King - ARM Linux
2013-08-01 20:09 ` Rob Herring
2013-08-01 20:15 ` Russell King - ARM Linux
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