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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 04196C433DF for ; Fri, 12 Jun 2020 07:41:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D04B2207ED for ; Fri, 12 Jun 2020 07:41:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726491AbgFLHl5 (ORCPT ); Fri, 12 Jun 2020 03:41:57 -0400 Received: from m17617.mail.qiye.163.com ([59.111.176.17]:25831 "EHLO m17617.mail.qiye.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726292AbgFLHl5 (ORCPT ); Fri, 12 Jun 2020 03:41:57 -0400 Received: from vivo-HP-ProDesk-680-G4-PCI-MT.vivo.xyz (unknown [58.251.74.226]) by m17617.mail.qiye.163.com (Hmail) with ESMTPA id E6F1326151C; Fri, 12 Jun 2020 15:41:52 +0800 (CST) From: Wang Qing To: Catalin Marinas , Will Deacon , James Morse , Mark Rutland , Dave Martin , Dmitry Safonov <0x7f454c46@gmail.com>, Thomas Gleixner , Wang Qing , jinho lim , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: opensource.kernel@vivo.com Subject: [PATCH] arm64: smp call when task currently running on other cpu Date: Fri, 12 Jun 2020 15:41:46 +0800 Message-Id: <1591947707-15140-1-git-send-email-wangqing@vivo.com> X-Mailer: git-send-email 2.7.4 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgYFAkeWUFZS1VLWVdZKFlBSE83V1ktWUFJV1kPCR oVCBIfWUFZQkJCHR8dHksfTx1DVkpOQkpCT0xMSkhPTk5VEwETFhoSFyQUDg9ZV1kWGg8SFR0UWU FZT0tIVUpKS0hKTFVKS0tZBg++ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6MRw6Ehw*HzgrTgsNFhoiSx1L AgMwCzFVSlVKTkJKQk9MTEpIQ0xJVTMWGhIXVQwaFRwKEhUcOw0SDRRVGBQWRVlXWRILWUFZTkNV SU5KVUxPVUlJTVlXWQgBWUFJTU9CNwY+ X-HM-Tid: 0a72a77a5b3a9375kuwse6f1326151c Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We cannot get FP and PC when the task is running on another CPU, task->thread.cpu_context is the last time the task was switched out, we can use smp call to print backtrace itself. Signed-off-by: Wang Qing --- arch/arm64/kernel/traps.c | 11 +++++++++++ 1 file changed, 11 insertions(+) mode change 100644 => 100755 arch/arm64/kernel/traps.c diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index 50cc30a..17a07b9 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -83,6 +83,11 @@ static void dump_kernel_instr(const char *lvl, struct pt_regs *regs) printk("%sCode: %s\n", lvl, str); } +static void dump_backtrace_smp_fun(struct task_struct *tsk) +{ + dump_backtrace(NULL, tsk, KERN_DEFAULT); +} + void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk, const char *loglvl) { @@ -107,6 +112,12 @@ void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk, start_backtrace(&frame, (unsigned long)__builtin_frame_address(0), (unsigned long)dump_backtrace); + } else if (task_curr(tsk)) { + /* + * The task is currently running on other cpu + */ + smp_call_function_single(tsk->cpu, dump_backtrace_fun, tsk, 0); + return; } else { /* * task blocked in __switch_to -- 2.7.4