From patchwork Mon Mar 15 13:53:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 401300 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,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 B7823C4160E for ; Mon, 15 Mar 2021 14:05:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A81F64F4B for ; Mon, 15 Mar 2021 14:05:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230027AbhCOOFL (ORCPT ); Mon, 15 Mar 2021 10:05:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:35446 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231907AbhCOOBK (ORCPT ); Mon, 15 Mar 2021 10:01:10 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9F83E64F16; Mon, 15 Mar 2021 14:00:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816836; bh=ffHiKX2x359sykKVshemZJfSIe3BzHOOXXmMQABK2nQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tCzqEEBh8a4KPvfv5hWjTaB3Mwzijs1xvrj9v56VfODcuNb+1i9R2v5oGumrP0BHO EgXR0uGDzIdnGoMoUAwFTUzXksmlmiWzi7pvkhJkh1fC1GjSPu+EjhWxLM5UapXUWg QLgzaTvQvMh/5BRAsYLIJyEtK7wM5Sw5l5hDrtkc= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nicholas Piggin , Michael Ellerman , Sasha Levin Subject: [PATCH 5.10 142/290] powerpc: improve handling of unrecoverable system reset Date: Mon, 15 Mar 2021 14:53:55 +0100 Message-Id: <20210315135546.711852192@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135541.921894249@linuxfoundation.org> References: <20210315135541.921894249@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Greg Kroah-Hartman 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 @@ void system_reset_exception(struct pt_regs *regs) 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);