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=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 7B5B0C433E1 for ; Mon, 25 May 2020 03:47:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5D88D206D5 for ; Mon, 25 May 2020 03:47:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="VM98ejsh" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728980AbgEYDrL (ORCPT ); Sun, 24 May 2020 23:47:11 -0400 Received: from mail-m973.mail.163.com ([123.126.97.3]:46642 "EHLO mail-m973.mail.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728324AbgEYDrL (ORCPT ); Sun, 24 May 2020 23:47:11 -0400 X-Greylist: delayed 911 seconds by postgrey-1.27 at vger.kernel.org; Sun, 24 May 2020 23:47:10 EDT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id; bh=6IIXyf48wsHgqxd09c IS/+VIQjuoiphPvmEZfA1FK2I=; b=VM98ejsh2KJDz3pcVRV6fzBVHFQbSmIFiG NxRiHdZH4PeEeRGgqy9+ZXOVxTv89q5goD/dvubwCXFHPBGmLmCnPFysdYAz+Xl1 5Lr570BxzahWFxtLl7Y9sIilGAM50wJuNJIBbo6NTWkkYyJfJZsXtjHCEcd20rfY IfztGiQ4I= Received: from localhost.localdomain (unknown [124.64.17.235]) by smtp3 (Coremail) with SMTP id G9xpCgA3pKwbPMte3DLsAg--.227S4; Mon, 25 May 2020 11:31:48 +0800 (CST) From: YuanJunQing To: tsbogend@alpha.franken.de Cc: paulburton@kernel.org, chenhc@lemote.com, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, liulichao@loongson.cn, YuanJunQing Subject: [PATCH] MIPS: Fix IRQ tracing when call handle_fpe() Date: Mon, 25 May 2020 11:31:23 +0800 Message-Id: <20200525033123.13114-1-yuanjunqing66@163.com> X-Mailer: git-send-email 2.17.1 X-CM-TRANSID: G9xpCgA3pKwbPMte3DLsAg--.227S4 X-Coremail-Antispam: 1Uf129KBjvdXoW7XrWUurykKryUurWrCF17KFg_yoWDXwc_Kr 4Iq3yj9rn8GwsxWF1xtw4rWr92gw4SgF9akryq9w4Yyr15urn09r4kWFykX3Z3Wr4SkFWI y3s8CFn3CF1xtjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IUUHUqUUUUUU== X-Originating-IP: [124.64.17.235] X-CM-SenderInfo: h1xd0ypxqtx0rjwwqiywtou0bp/1tbiNgQvXFWBjPQihAAAsL Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Register "a1" is unsaved in this function, when CONFIG_TRACE_IRQFLAGS is enabled, the TRACE_IRQS_OFF macro will call trace_hardirqs_off(), and this may change register "a1". The variment of register "a1" may send SIGFPE signal to task when call do_fpe(),and this may kill the task. Signed-off-by: YuanJunQing --- arch/mips/kernel/genex.S | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S index 8236fb291e3f..956a76429773 100644 --- a/arch/mips/kernel/genex.S +++ b/arch/mips/kernel/genex.S @@ -480,16 +480,18 @@ NESTED(nmi_handler, PT_SIZE, sp) /* gas fails to assemble cfc1 for some archs (octeon).*/ \ .set mips1 SET_HARDFLOAT - cfc1 a1, fcr31 + cfc1 s0, fcr31 .set pop CLI TRACE_IRQS_OFF + move a1,s0 .endm .macro __build_clear_msa_fpe - _cfcmsa a1, MSA_CSR + _cfcmsa s0, MSA_CSR CLI TRACE_IRQS_OFF + move a1,s0 .endm .macro __build_clear_ade -- 2.17.1