From patchwork Tue Mar 10 17:43:35 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 214204 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, URIBL_BLOCKED, 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 139A0C3F2D0 for ; Tue, 10 Mar 2020 17:43:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DED6F222C3 for ; Tue, 10 Mar 2020 17:43:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726426AbgCJRnl (ORCPT ); Tue, 10 Mar 2020 13:43:41 -0400 Received: from mga11.intel.com ([192.55.52.93]:20632 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726269AbgCJRnl (ORCPT ); Tue, 10 Mar 2020 13:43:41 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Mar 2020 10:43:40 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,537,1574150400"; d="scan'208";a="234420081" Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga007.fm.intel.com with ESMTP; 10 Mar 2020 10:43:39 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id CC6106A; Tue, 10 Mar 2020 19:43:38 +0200 (EET) From: Andy Shevchenko To: Greg Kroah-Hartman , linux-serial@vger.kernel.org, Dmitry Safonov <0x7f454c46@gmail.com> Cc: Andy Shevchenko Subject: [PATCH v2 2/4] serial: core: Print escaped SysRq Magic sequence if enabled Date: Tue, 10 Mar 2020 19:43:35 +0200 Message-Id: <20200310174337.74109-2-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200310174337.74109-1-andriy.shevchenko@linux.intel.com> References: <20200310174337.74109-1-andriy.shevchenko@linux.intel.com> MIME-Version: 1.0 Sender: linux-serial-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org It is useful to see on the serial console the magic sequence itself to enable SysRq without rummaging source code. Reviewed-by: Dmitry Safonov <0x7f454c46@gmail.com> Signed-off-by: Andy Shevchenko --- v2: add tag drivers/tty/serial/serial_core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index ec3b833e9f22..e3f2afc15ad4 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -3191,8 +3191,11 @@ static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE; static void uart_sysrq_on(struct work_struct *w) { + int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); + sysrq_toggle_support(1); - pr_info("SysRq is enabled by magic sequence on serial\n"); + pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n", + sysrq_toggle_seq_len, sysrq_toggle_seq); } static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on);