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[209.132.180.67]) by mx.google.com with ESMTP id f10si6829967ejr.129.2019.11.16.02.55.53; Sat, 16 Nov 2019 02:56:28 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail (test mode) header.i=@armlinux.org.uk header.s=pandora-2019 header.b=m4OI0FC8; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=armlinux.org.uk Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727414AbfKPKuD (ORCPT + 99 others); Sat, 16 Nov 2019 05:50:03 -0500 Received: from pandora.armlinux.org.uk ([78.32.30.218]:59400 "EHLO pandora.armlinux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726794AbfKPKuC (ORCPT ); Sat, 16 Nov 2019 05:50:02 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=D521F5TA31KjTzw2pGHrAaQYXT1UKy+cBhgY5ORVh8U=; b=m4OI0FC8DC3aEC56/n2cdCPPd UcCS1ua2xs7DUNYqa1ax0vCbc3IWWOTq830lAbad1xFED3Lz7Qwj2FFZ0mm58ex+JBYk4t65YlesO OR1i2LwKEZ2AEFr5DJLAHoV5WXApfnBs/UB2dQI4GoPJ6tZEhMkgO0t2v+zZ1N5wE84uI5r8DD1r6 DR/+jdX78YTt7g6KaSqRgBvKeTehYt1n7c1C1eZ3RV8xV9iKg6ufF/gqOKcQ0ezN7+VBGiD68ODL7 mxY7BHAC1jTwbg5rHFOnQ5gpifo2Z/frmdPejL3nyOy2+yxdJI+ZWIvZLSqffryDH0mJyIXEI9Upf P4kfcZyfQ==; Received: from shell.armlinux.org.uk ([2002:4e20:1eda:1:5054:ff:fe00:4ec]:36222) by pandora.armlinux.org.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1iVveA-00072t-2z; Sat, 16 Nov 2019 10:49:42 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1iVve0-0005QC-NG; Sat, 16 Nov 2019 10:49:32 +0000 Date: Sat, 16 Nov 2019 10:49:32 +0000 From: Russell King - ARM Linux admin To: Ard Biesheuvel Cc: "kernelci.org bot" , Arnd Bergmann , Ard Biesheuvel , tomeu.vizoso@collabora.com, Guillaume Tucker , mgalka@collabora.com, Mark Brown , Matt Hart , Kevin Hilman , Enric Balletbo i Serra , Marc Zyngier , Linus Walleij , Linux Kernel Mailing List , Thomas Gleixner , Stefan Agner , Nicolas Pitre , Nick Desaulniers , linux-arm-kernel Subject: Re: rmk/for-next bisection: boot on ox820-cloudengines-pogoplug-series-3 Message-ID: <20191116104932.GT25745@shell.armlinux.org.uk> References: <5dcf8f19.1c69fb81.c02f3.91f2@mx.google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Nov 16, 2019 at 10:26:27AM +0000, Ard Biesheuvel wrote: > (+ Arnd) > > On Sat, 16 Nov 2019 at 05:54, kernelci.org bot wrote: > > > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * > > * This automated bisection report was sent to you on the basis * > > * that you may be involved with the breaking commit it has * > > * found. No manual investigation has been done to verify it, * > > * and the root cause of the problem may be somewhere else. * > > * * > > * If you do send a fix, please include this trailer: * > > * Reported-by: "kernelci.org bot" * > > * * > > * Hope this helps! * > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * > > > > rmk/for-next bisection: boot on ox820-cloudengines-pogoplug-series-3 > > > > Summary: > > Start: b6c3c42cfda0 ARM: 8938/1: kernel: initialize broadcast hrtimer based clock event device > > Details: https://kernelci.org/boot/id/5dcf3f0359b514dc84cf54c8 > > Plain log: https://storage.kernelci.org//rmk/for-next/v5.4-rc5-26-gb6c3c42cfda0/arm/oxnas_v6_defconfig/gcc-8/lab-baylibre/boot-ox820-cloudengines-pogoplug-series-3.txt > > HTML log: https://storage.kernelci.org//rmk/for-next/v5.4-rc5-26-gb6c3c42cfda0/arm/oxnas_v6_defconfig/gcc-8/lab-baylibre/boot-ox820-cloudengines-pogoplug-series-3.html > > Result: ea70bf6e92c5 ARM: 8935/1: decompressor: avoid CP15 barrier instructions in v7 cache setup code > > > > OK, so this regression is caused by the fact that the 'armv7' cache > maintenance routines in the decompressor are also used for ARMv6 cores > if they implement the CPUID extension, which I failed to realise when > I sent this patch. > > There are roughly three ways to deal with this: > 1) add a mask/val match pair for ARM11MPcore and ARM1176 that hardwire > them to the ARMv6 routines, even though they implement the CPUID > extension. This would be very easy, but assumes that those two cores > are the only ones that are affected by this. > 2) modify the v7 routines to check for the L1Hvd MMFR1 attribute (in > the flush routine) and for the CP15BEN SCTLR bit (in the on/off > routines), and jump to the respective v6 variants if the CPU turns out > not to support the v7 one. > 3) revert the patch, and just enable the CP15 barriers (and issue a v7 > barrier) in the v7 on() and flush() routines. > > I am leaning towards the latter, since it is the most straightforward, > even though it mixes v7 and cp15 barriers in the same function, but > that was mostly a cosmetic concern anyway. I'm going to drop the patches - if -rc8 is released tomorrow maybe we can have a go at solving it next week. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up