From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Rutland Subject: Re: [PATCH 3/9] arm64: mm: install SError abort handler Date: Fri, 24 Mar 2017 17:35:15 +0000 Message-ID: <20170324173515.GB10746@leverpostej> References: <20170324144632.5896-1-opendmb@gmail.com> <20170324144632.5896-4-opendmb@gmail.com> <20170324151654.GD29588@leverpostej> <58D54DE8.9020707@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <58D54DE8.9020707@gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Doug Berger Cc: wangkefeng.wang@huawei.com, catalin.marinas@arm.com, linus.walleij@linaro.org, will.deacon@arm.com, mingo@kernel.org, panand@redhat.com, f.fainelli@gmail.com, jonathanh@nvidia.com, bgolaszewski@baylibre.com, bcm-kernel-feedback-list@broadcom.com, shijie.huang@arm.com, treding@nvidia.com, devicetree@vger.kernel.org, vladimir.murzin@arm.com, cmetcalf@mellanox.com, suzuki.poulose@arm.com, andre.przywara@arm.com, robh+dt@kernel.org, gregory.0xf0@gmail.com, sandeepa.s.prabhu@gmail.com, horms+renesas@verge.net.au, linux-arm-kernel@lists.infradead.org, mirza.krak@gmail.com, linux-kernel@vger.kernel.org, james.morse@arm.com, olof@lixom.net, computersforpeace@gmail.com List-Id: devicetree@vger.kernel.org On Fri, Mar 24, 2017 at 09:48:40AM -0700, Doug Berger wrote: > On 03/24/2017 08:16 AM, Mark Rutland wrote: > >On Fri, Mar 24, 2017 at 07:46:26AM -0700, Doug Berger wrote: > If you would consider an alternative implementation where we scrap > the SError handler (i.e. maintain the ugliness in our downstream > kernel) in favor of a more gentle user mode crash on SError that > allows the kernel the opportunity to service the interrupt for > diagnostic purposes I could try to repackage that. If this is just for diagnostic purposes, I believe you can register a panic notifier, which can then read from the bus. The panic will occur, but you'll have the opportunity to log some information to dmesg. Thanks, Mark.