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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 3B6AAC43381 for ; Mon, 11 Mar 2019 20:09:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0097A214AF for ; Mon, 11 Mar 2019 20:09:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552334977; bh=it8lY9TZDTewnGZR8yaGYsXgoP1j7QOUfj3hV9NYNTY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=02jPD3VZwajVd7irTqQZK54r1ESQMyBJPxzQWFZ4mNQ1v5r6JcS9XVAP8G/coqCMQ 2a5tNXaFnXbiw9ZTJoUdo0KKE0yUVg7Z79FQWnftsRILBgWtwSOxMNmBWD26QL1zxo hsC+8BE4D7hnOuKH2+Hw9WeIxwFGG6zHszUxB8CA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728862AbfCKT4q (ORCPT ); Mon, 11 Mar 2019 15:56:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:33956 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728749AbfCKT4l (ORCPT ); Mon, 11 Mar 2019 15:56:41 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A60C9214AE; Mon, 11 Mar 2019 19:56:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552334201; bh=it8lY9TZDTewnGZR8yaGYsXgoP1j7QOUfj3hV9NYNTY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VvHcI8Ah7CI2/RskHbEORtezFKLyL5SlAz7Uw37+o6OO7FN4h0lbYyJXi8Oj43LrM glic1p/cClIIaGJyv4OJts8963n7l4PslLRffYUhatwk5NpwyaGQKCmV0E7cjWZ022 UaBsnOVbDQ3ZWyUq6pDazENtxbKSlqZrZGXVO52U= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Guo Ren , Sasha Levin Subject: [PATCH AUTOSEL 4.20 42/52] csky: Fixup dead loop in show_stack Date: Mon, 11 Mar 2019 15:55:06 -0400 Message-Id: <20190311195516.137772-42-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190311195516.137772-1-sashal@kernel.org> References: <20190311195516.137772-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Guo Ren [ Upstream commit 131aee8b9807bc98379fa5a0270389dbc7dcec90 ] When STACKTRACE is enabled, we must pass fp as stack for unwind, otherwise random value in stack will casue a dead loop. Signed-off-by: Guo Ren Reported-by: Lu Baoquan Signed-off-by: Sasha Levin --- arch/csky/kernel/dumpstack.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/csky/kernel/dumpstack.c b/arch/csky/kernel/dumpstack.c index a9a03ac57ec5..28d2deb0848d 100644 --- a/arch/csky/kernel/dumpstack.c +++ b/arch/csky/kernel/dumpstack.c @@ -47,7 +47,11 @@ void show_stack(struct task_struct *task, unsigned long *stack) if (task) stack = (unsigned long *)task->thread.esp0; else +#ifdef CONFIG_STACKTRACE + asm volatile("mov %0, r8\n":"=r"(stack)::"memory"); +#else stack = (unsigned long *)&stack; +#endif } endstack = (unsigned long *) (((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE); -- 2.19.1