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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,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 4DA14C433F5 for ; Mon, 13 Sep 2021 05:46:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 32FF360E90 for ; Mon, 13 Sep 2021 05:46:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237097AbhIMFrT (ORCPT ); Mon, 13 Sep 2021 01:47:19 -0400 Received: from pv50p00im-ztdg10021901.me.com ([17.58.6.55]:55113 "EHLO pv50p00im-ztdg10021901.me.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232041AbhIMFrR (ORCPT ); Mon, 13 Sep 2021 01:47:17 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=icloud.com; s=1a1hai; t=1631511446; bh=dePJyHcuaFN4g6WiG86/8aHijMqYflSApma+4vcsLKU=; h=From:To:Subject:Date:Message-Id:MIME-Version; b=zvDVenfkf60eRcs6TTae3/ariTILKcgyvhO/B7n7BA5YFwBOpObdeVawdaCljfTt/ zfZOe9Ti2FYHq6vjsu2w0zbSnlzDwSV/qCv5EclmFEfI/7D0FVBoOtgzslT5TFhBcB DX27tgsmLaTEt3ZmX8PEAErkNIHyeSvHOm5WDxQ/3KBZCoJsKJ/aD1+sksAa+yECGO QJpxkK3I8PYfnYFVhkJHnHwS8+aDwIFVG7JthrPdQu+iakSLHR190QqgdV0P7Sa3yv aCQLhMFAHpELyy0avnJN/K0wpWqtlw3pYiwNJELh1jZktuAqwOvVlfMFKk0rEl9Hbk sMsXG7wRlL1jw== Received: from localhost.localdomain (unknown [58.240.82.166]) by pv50p00im-ztdg10021901.me.com (Postfix) with ESMTPSA id 84237880279; Mon, 13 Sep 2021 05:37:23 +0000 (UTC) From: wangyangbo To: tsbogend@alpha.franken.de, hejinyang@loongson.cn, chenhuacai@kernel.org, peterz@infradead.org, frederic@kernel.org, axboe@kernel.dk Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, xiehuanjun@uniontech.com, wangyangbo Subject: [PATCH 1/1] MIPS: Fix fpu trap invoked by io-worker Date: Mon, 13 Sep 2021 13:37:17 +0800 Message-Id: X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-09-13_02:2021-09-09,2021-09-13 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 mlxscore=0 mlxlogscore=745 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-2009150000 definitions=main-2109130036 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: wangyangbo Create worker thread from original user task in mips, possibly copying FPU flag from user task, introducing save_fp when switch_to, triggering do_cpu trap. So clear USEDFPU flag for IO_WORKER in copy_thread. Signed-off-by: wangyangbo --- arch/mips/kernel/process.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index 95aa86fa6077..0095006d48c7 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -135,6 +135,9 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, status |= ST0_EXL; #endif childregs->cp0_status = status; + + if (p->flags & PF_IO_WORKER) + clear_tsk_thread_flag(p, TIF_USEDFPU); return 0; } -- 2.20.1