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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 957C4C433E0 for ; Fri, 12 Jun 2020 07:42:15 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 649A7207ED for ; Fri, 12 Jun 2020 07:42:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="qGgzg/t0" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 649A7207ED Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=vivo.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: References:List-Owner; bh=G+jSsnt9TG2huXMkFu+ukcZ+7QfpcUK2lwPyRfx/Cic=; b=qGg zg/t0PuFNKf57B6sKGfhkEiRAAGfCAtkbaNDZzL/U/Sk2XhQ72MQDyKzT+Xwi6m8i0/v/eu/MTFrX wlARw8fzuIVL3jCkS44p20tSaNyq2F8oR+MxRFALysozy9E2wkc1uRv9eXFpYT8OV21AJc4OtBgd2 MwbFa780xw+YF6J/mm9MK8Vrwd3OZiy7phuff5FVmFLIDu+DIdObJ6iXEFjm3IOv+Jux/ixDKl9jx QKlf3zZXE3xv3kP02ohmPMhiHlJfTe+FgaKjZar2BpNXIdMUnios6rAJ8e8eSJ5TDnqvJRFv+uW+n fMFmyyaxi4zP0Ud5C0UMr+aUMoi1opA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jjeKH-0000n3-Ox; Fri, 12 Jun 2020 07:42:09 +0000 Received: from m17617.mail.qiye.163.com ([59.111.176.17]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jjeKD-0000lt-8Y for linux-arm-kernel@lists.infradead.org; Fri, 12 Jun 2020 07:42:07 +0000 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 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200612_004205_577788_AA375845 X-CRM114-Status: UNSURE ( 8.05 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: opensource.kernel@vivo.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel