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 X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24CC9C433DB for ; Tue, 2 Mar 2021 16:09:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E61C664F18 for ; Tue, 2 Mar 2021 16:09:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1839071AbhCBQFW (ORCPT ); Tue, 2 Mar 2021 11:05:22 -0500 Received: from mail.kernel.org ([198.145.29.99]:35852 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1446274AbhCBN25 (ORCPT ); Tue, 2 Mar 2021 08:28:57 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6283C64F5C; Tue, 2 Mar 2021 11:57:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1614686227; bh=JXnZzuhfjp+IoFjmftM4WsrePuwRN8h6VGXcC/RrJo4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S+cvuqYgyltNcPZU0ot6QiUrWqBnsEP+VTYSEkbRYisfmUMnxSEBr97GYQ+r7fnxb ONwh83/DluVORSrebnh+rlxJ83H+pbLwYXqN20FCeQbtcjKhHoyRHV8pq4bgSxDPbB pnPQkUtPA21ecB/7MUOO8SMZGtFEkvjTzcD1TiRaWfzfuWBrqW8idntfiHAhIQ8lQ4 E5Adk0ILo0flJXSAzydEoTfQcnoA4xwVU5f6GR7EWAbGGeD6oYbrc8ahkfRLdPI7z8 9usYp0IxLw80gkkiuMP3M7WJDievYB3zeBYJcBD99LKre20O4gpy2gnDmqlKSn/963 SEwx80wu6aZeQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nicholas Piggin , Michael Ellerman , Sasha Levin , linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 5.10 16/47] powerpc: improve handling of unrecoverable system reset Date: Tue, 2 Mar 2021 06:56:15 -0500 Message-Id: <20210302115646.62291-16-sashal@kernel.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210302115646.62291-1-sashal@kernel.org> References: <20210302115646.62291-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nicholas Piggin [ Upstream commit 11cb0a25f71818ca7ab4856548ecfd83c169aa4d ] If an unrecoverable system reset hits in process context, the system does not have to panic. Similar to machine check, call nmi_exit() before die(). Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210130130852.2952424-26-npiggin@gmail.com Signed-off-by: Sasha Levin --- arch/powerpc/kernel/traps.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 5006dcbe1d9f..77dffea3d537 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -509,8 +509,11 @@ out: die("Unrecoverable nested System Reset", regs, SIGABRT); #endif /* Must die if the interrupt is not recoverable */ - if (!(regs->msr & MSR_RI)) + if (!(regs->msr & MSR_RI)) { + /* For the reason explained in die_mce, nmi_exit before die */ + nmi_exit(); die("Unrecoverable System Reset", regs, SIGABRT); + } if (saved_hsrrs) { mtspr(SPRN_HSRR0, hsrr0); -- 2.30.1 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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C9DE2C433DB for ; Tue, 2 Mar 2021 11:58:26 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C84CC64F97 for ; Tue, 2 Mar 2021 11:58:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C84CC64F97 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4DqbHh2NP7z3dVd for ; Tue, 2 Mar 2021 22:58:24 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=S+cvuqYg; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=198.145.29.99; helo=mail.kernel.org; envelope-from=sashal@kernel.org; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=S+cvuqYg; dkim-atps=neutral Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4DqbGD68Mwz3dFk for ; Tue, 2 Mar 2021 22:57:08 +1100 (AEDT) Received: by mail.kernel.org (Postfix) with ESMTPSA id 6283C64F5C; Tue, 2 Mar 2021 11:57:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1614686227; bh=JXnZzuhfjp+IoFjmftM4WsrePuwRN8h6VGXcC/RrJo4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S+cvuqYgyltNcPZU0ot6QiUrWqBnsEP+VTYSEkbRYisfmUMnxSEBr97GYQ+r7fnxb ONwh83/DluVORSrebnh+rlxJ83H+pbLwYXqN20FCeQbtcjKhHoyRHV8pq4bgSxDPbB pnPQkUtPA21ecB/7MUOO8SMZGtFEkvjTzcD1TiRaWfzfuWBrqW8idntfiHAhIQ8lQ4 E5Adk0ILo0flJXSAzydEoTfQcnoA4xwVU5f6GR7EWAbGGeD6oYbrc8ahkfRLdPI7z8 9usYp0IxLw80gkkiuMP3M7WJDievYB3zeBYJcBD99LKre20O4gpy2gnDmqlKSn/963 SEwx80wu6aZeQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.10 16/47] powerpc: improve handling of unrecoverable system reset Date: Tue, 2 Mar 2021 06:56:15 -0500 Message-Id: <20210302115646.62291-16-sashal@kernel.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210302115646.62291-1-sashal@kernel.org> References: <20210302115646.62291-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , linuxppc-dev@lists.ozlabs.org, Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Nicholas Piggin [ Upstream commit 11cb0a25f71818ca7ab4856548ecfd83c169aa4d ] If an unrecoverable system reset hits in process context, the system does not have to panic. Similar to machine check, call nmi_exit() before die(). Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210130130852.2952424-26-npiggin@gmail.com Signed-off-by: Sasha Levin --- arch/powerpc/kernel/traps.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 5006dcbe1d9f..77dffea3d537 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -509,8 +509,11 @@ out: die("Unrecoverable nested System Reset", regs, SIGABRT); #endif /* Must die if the interrupt is not recoverable */ - if (!(regs->msr & MSR_RI)) + if (!(regs->msr & MSR_RI)) { + /* For the reason explained in die_mce, nmi_exit before die */ + nmi_exit(); die("Unrecoverable System Reset", regs, SIGABRT); + } if (saved_hsrrs) { mtspr(SPRN_HSRR0, hsrr0); -- 2.30.1