From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 52349ECAAA1 for ; Fri, 28 Oct 2022 00:30:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234552AbiJ1Aaq (ORCPT ); Thu, 27 Oct 2022 20:30:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33298 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233884AbiJ1Aan (ORCPT ); Thu, 27 Oct 2022 20:30:43 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 38E8E5BC92 for ; Thu, 27 Oct 2022 17:30:42 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C89576255E for ; Fri, 28 Oct 2022 00:30:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4D56AC43470; Fri, 28 Oct 2022 00:30:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1666917041; bh=1cgQsn8Dl8oXXAx8gvKuL8W/RjgtqyJAH9sgnpZyd8Y=; h=Date:From:To:CC:Subject:In-Reply-To:References:From; b=AzadYNM69bZgFK5FQbyUM3syPXPVbs+PDGuRBl8e/w7FuXXt7a5R37YusxtHWZBb/ r7jrETa6edX5JkceiAvS9MkzI3q7Ga/0Q/Jt2MLvYdOtjjkfozqftAd78QlTKQ0Bu8 tSTgPy/UX5XNhskAR5OtuWoroldW3Zd8Bpup1pGTCKtpSTiKeu13HId2RAVL0YUlaA t97L5UvVKFv/3h7X2BuENXopk1uM32aBnbfgys8667lOutidYRYRMRJp80qJSkripQ jhenbmDEqIv6LjX7DPaNYb67wxDT9l+x0sIjhmp+tArSD5E8cBDX6MVuL91hcIjotU QjD+zm3r+JQ5g== Date: Fri, 28 Oct 2022 01:30:34 +0100 From: Conor Dooley To: Samuel Holland , Palmer Dabbelt , apatel@ventanamicro.com CC: daniel.lezcano@linaro.org, tglx@linutronix.de, aou@eecs.berkeley.edu, atishp@atishpatra.org, dmitriy@oss-tech.org, Paul Walmsley , linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: =?US-ASCII?Q?Re=3A_=5BPATCH=5D_clocksource/drivers/riscv=3A?= =?US-ASCII?Q?_Events_are_stopped_during_CPU_suspend?= User-Agent: K-9 Mail for Android In-Reply-To: <40abce35-b8de-cd5c-f544-fcf344e7057c@sholland.org> References: <40abce35-b8de-cd5c-f544-fcf344e7057c@sholland.org> Message-ID: <6354C70F-86C7-430D-AF0A-3483B772B02C@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 28 October 2022 00:41:45 IST, Samuel Holland wr= ote: > >I still don't see why you consider this patch to have broken anything=2E >Can anyone explain why getting an RCU stall is better than not getting on= e? Taking that to the extreme, why even have RCU stall detection at all? It's= not a case of with the patch the system works fine and without it there ar= e stalls=2E With the patch, the system completely locks up during boot and = never makes progress=2E I think I've done a bad job of getting across that = the system just dies during boot=2E (Apologies for formatting, mobile=2E=2E=2E) From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D5C7BECAAA1 for ; Fri, 28 Oct 2022 00:31:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:References: In-Reply-To:Subject:CC:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=8LiKw1wm6u+eDDXv8FDjMRw+95ZsGpCQlaIstbXfn8o=; b=iUs++LGOnHI8ui RPT95aVW1/WQtuuNt8TwI3xKxVj5jDlMpckNlok4rPg9LBczDI9J0QbDHD5LKWDG5YlDv8i72zxuw tTJDDTSGYeO7KBKPtdSNWVKknOIdbC56y2+fgHxiQ5Yj9OW4fNbPAUHY6atUP7+7np/RcaLIt9xbR r8uar4RAXippsZLICf9f/8qmQG4GryrJYQe2pTRVU43hUMSvBJahnZNSLfrAAc7bXbazUbsXR6lDW Xmk3Gu8+0WOI+uAYQs16cnshz6cLPmgKZQrf2pBVvY+gdtl7ggR/bFeJl6nkxgAurimbBA7hzW3Cr 8MOb/eufAgX79uIBoKcA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ooDGn-00FILw-9e; Fri, 28 Oct 2022 00:30:45 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ooDGk-00FILb-7F for linux-riscv@lists.infradead.org; Fri, 28 Oct 2022 00:30:44 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id BA0D660C24; Fri, 28 Oct 2022 00:30:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4D56AC43470; Fri, 28 Oct 2022 00:30:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1666917041; bh=1cgQsn8Dl8oXXAx8gvKuL8W/RjgtqyJAH9sgnpZyd8Y=; h=Date:From:To:CC:Subject:In-Reply-To:References:From; b=AzadYNM69bZgFK5FQbyUM3syPXPVbs+PDGuRBl8e/w7FuXXt7a5R37YusxtHWZBb/ r7jrETa6edX5JkceiAvS9MkzI3q7Ga/0Q/Jt2MLvYdOtjjkfozqftAd78QlTKQ0Bu8 tSTgPy/UX5XNhskAR5OtuWoroldW3Zd8Bpup1pGTCKtpSTiKeu13HId2RAVL0YUlaA t97L5UvVKFv/3h7X2BuENXopk1uM32aBnbfgys8667lOutidYRYRMRJp80qJSkripQ jhenbmDEqIv6LjX7DPaNYb67wxDT9l+x0sIjhmp+tArSD5E8cBDX6MVuL91hcIjotU QjD+zm3r+JQ5g== Date: Fri, 28 Oct 2022 01:30:34 +0100 From: Conor Dooley To: Samuel Holland , Palmer Dabbelt , apatel@ventanamicro.com CC: daniel.lezcano@linaro.org, tglx@linutronix.de, aou@eecs.berkeley.edu, atishp@atishpatra.org, dmitriy@oss-tech.org, Paul Walmsley , linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: =?US-ASCII?Q?Re=3A_=5BPATCH=5D_clocksource/drivers/riscv=3A?= =?US-ASCII?Q?_Events_are_stopped_during_CPU_suspend?= User-Agent: K-9 Mail for Android In-Reply-To: <40abce35-b8de-cd5c-f544-fcf344e7057c@sholland.org> References: <40abce35-b8de-cd5c-f544-fcf344e7057c@sholland.org> Message-ID: <6354C70F-86C7-430D-AF0A-3483B772B02C@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221027_173042_316255_16B204F1 X-CRM114-Status: UNSURE ( 8.78 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 28 October 2022 00:41:45 IST, Samuel Holland wrote: > >I still don't see why you consider this patch to have broken anything. >Can anyone explain why getting an RCU stall is better than not getting one? Taking that to the extreme, why even have RCU stall detection at all? It's not a case of with the patch the system works fine and without it there are stalls. With the patch, the system completely locks up during boot and never makes progress. I think I've done a bad job of getting across that the system just dies during boot. (Apologies for formatting, mobile...) _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv