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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39790C433FE for ; Wed, 30 Mar 2022 12:07:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347526AbiC3MHA (ORCPT ); Wed, 30 Mar 2022 08:07:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58242 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345923AbiC3LzN (ORCPT ); Wed, 30 Mar 2022 07:55:13 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 44F111123; Wed, 30 Mar 2022 04:52:47 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D4C1A61704; Wed, 30 Mar 2022 11:52:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 75A75C340F2; Wed, 30 Mar 2022 11:52:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648641166; bh=TKcevPeptTWHHHU+L4KxFstKJDva+Ts+JdZWMCcf/c8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ULmHXiK151DsPBuJw/PX00JP/rV8DdRmL+4avp198OZQddK4WHYfjF59htlMytEGc SeWzfIOlgEWjEni7K9J0d+lEwpXB4TqSVnw3uEeo6NhvWVzehD/+3u4w8+x6RkiA0J XVTa2OWQp7xlldb2UI+dLFsVWKeXaz53Lt2fN6mzkh5bWT4uwXiydlMuWlmgPE4eT/ dahHsH0aqh1dqNLgddgnNF/ReDB8U5d2LaXTbH6w9sBLsw70u3up+iniY671k0dGsr EMjse7xrVae6WV25jykX5oQfNbjl3b34cTXZTWXwL7FLJArRoDHAVMi9qdSZEEuEIy Wy9kDDNxTaCig== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Stephen Brennan , Petr Mladek , Sergey Senozhatsky , Sasha Levin , gregkh@linuxfoundation.org Subject: [PATCH AUTOSEL 5.4 13/25] printk: Add panic_in_progress helper Date: Wed, 30 Mar 2022 07:52:13 -0400 Message-Id: <20220330115225.1672278-13-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220330115225.1672278-1-sashal@kernel.org> References: <20220330115225.1672278-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Stephen Brennan [ Upstream commit 77498617857f68496b360081dde1a492d40c28b2 ] This will be used help avoid deadlocks during panics. Although it would be better to include this in linux/panic.h, it would require that header to include linux/atomic.h as well. On some architectures, this results in a circular dependency as well. So instead add the helper directly to printk.c. Suggested-by: Petr Mladek Signed-off-by: Stephen Brennan Reviewed-by: Petr Mladek Reviewed-by: Sergey Senozhatsky Signed-off-by: Petr Mladek Link: https://lore.kernel.org/r/20220202171821.179394-2-stephen.s.brennan@oracle.com Signed-off-by: Sasha Levin --- kernel/printk/printk.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 23e26a203a9e..0989920e8cef 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -256,6 +256,11 @@ static void __up_console_sem(unsigned long ip) } #define up_console_sem() __up_console_sem(_RET_IP_) +static bool panic_in_progress(void) +{ + return unlikely(atomic_read(&panic_cpu) != PANIC_CPU_INVALID); +} + /* * This is used for debugging the mess that is the VT code by * keeping track if we have the console semaphore held. It's -- 2.34.1