From nobody Fri Dec 19 21:49:48 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A292D7317A for ; Sun, 18 Feb 2024 18:57:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708282679; cv=none; b=nPpM93eBy+4c56RG3dRpRKHaeKRaNf/2YxTC4zoABYBM+UdoBdn1veetzkAhV4YhLPrRX7mLRvR3CzqcVmHuHsgGESvJDu6ubKl2iCAf0oUCppHh6Es48s/nL0VuAL3oTk00GboafuvpyKdiH1BsNpj2VlIXJUZyEWa+xSQcGBo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708282679; c=relaxed/simple; bh=9MS2P3GionMP7c/6VZMtfIJf7yMWxofhT265EbuKiDI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=L5vW3rahW7wFn1bkbFGNkQ07MvFg9JSsoUWBYhIY7BefMZM+xCqcxUaN96gTGuym/OGCXJ9FlfU/3nWSaLcwIhP+meX8wQimcmQWS45MTMlHor8ACdZhfxqEYpukdpwkf8DbRLlV37zSFCR3KahtbErh2kmifDwebBTNLpPc65k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=kxf6wz3G; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=5wm9tfqa; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="kxf6wz3G"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="5wm9tfqa" From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1708282676; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GUbvpoY1vkrIaf4t1+bOO9YGAlSrhJitnWRmUehFKmc=; b=kxf6wz3GUu4qdeFhzXpICe2cGfNBJSkLoT82KX/lAcZbK1dpaDV/emR2wz9uRLKOm+7pfV X+65xFM6mk8goNdIDmv2Jm7NzIGQE0DHhH/fVd+3jNKDsTSF/cfMY8YcxIz3z8RKWnF4lH 4yAjPwxF7ORRa1JtkbmQdQLOx04iIefHtB3a34F0yRu19Yl7rKB17/M3lnBFsI52GYqL3m kGPiT6n+5j5nKi6vPBIyJ0LRhiqo9I9qM6neXMzdICMbTtpcsLiU2b47FmUcOkziXOeCyY BmiguoKf+t3UIdk5pyMCAUtol6CnxZM50YfQ0OiQvu68h708WfRRiJUnaOqDbw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1708282676; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GUbvpoY1vkrIaf4t1+bOO9YGAlSrhJitnWRmUehFKmc=; b=5wm9tfqaTzyXeL2PKtyecqBe9en8uVauawNKYe+bAlM4JD8JFvwFjfMjY+AJsxeI8QH6y9 U5DlklXhgWwT55Aw== To: Petr Mladek Cc: Sergey Senozhatsky , Steven Rostedt , Thomas Gleixner , linux-kernel@vger.kernel.org, Andrew Morton , Josh Poimboeuf , "Peter Zijlstra (Intel)" , Kefeng Wang , "Guilherme G. Piccoli" , Uros Bizjak , Arnd Bergmann Subject: [PATCH printk v2 23/26] panic: Mark emergency section in warn Date: Sun, 18 Feb 2024 20:03:23 +0106 Message-Id: <20240218185726.1994771-24-john.ogness@linutronix.de> In-Reply-To: <20240218185726.1994771-1-john.ogness@linutronix.de> References: <20240218185726.1994771-1-john.ogness@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Thomas Gleixner Mark the full contents of __warn() as an emergency section. In this section, the CPU will not perform console output for the printk() calls. Instead, a flushing of the console output is triggered when exiting the emergency section. Co-developed-by: John Ogness Signed-off-by: John Ogness Signed-off-by: Thomas Gleixner (Intel) Reviewed-by: Petr Mladek --- kernel/panic.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/panic.c b/kernel/panic.c index 86813305510f..d30d261f9246 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -667,6 +667,8 @@ struct warn_args { void __warn(const char *file, int line, void *caller, unsigned taint, struct pt_regs *regs, struct warn_args *args) { + nbcon_cpu_emergency_enter(); + disable_trace_on_warning(); =20 if (file) @@ -697,6 +699,8 @@ void __warn(const char *file, int line, void *caller, u= nsigned taint, =20 /* Just a warning, don't kill lockdep. */ add_taint(taint, LOCKDEP_STILL_OK); + + nbcon_cpu_emergency_exit(); } =20 #ifdef CONFIG_BUG --=20 2.39.2