From nobody Fri Feb 13 15:10:17 2026 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 B9C4313A890 for ; Mon, 27 May 2024 06:38:28 +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=1716791910; cv=none; b=bEXLiC6n6Yuw9IXFwLyAi+SSFshpdAJOGVVCxkXwnFC6USWbDLk01+UuPf1ytofXE135baL0OCUSuiY5vNow6qshpki+wdK9pv1XVC/gQo29lu0OS31vfeziPLzbVDcIAOABOy4jSbzHc4chlp150fMvUzeFk+IsB5/PZot6cQ4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716791910; c=relaxed/simple; bh=sIDwBVtEZ9II9z34FVW/arDvGAYqJE9qC2xSXnoiiY8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=SNHojcFJHH18EWfVvMN2COeK1DJ1aU+Fl6/mqMRILfDKAysSSjw7T3JeOeJHX0VS4VkETGh6OD4zd0f5sHub8hMyFsik59fM2Rk4BweNiSiuuRkM97RPmJ+BeiKv4RtfjJpmRNZzgUJkrqKtxBhwdP6dj7fHVV+7MHey1XKkrvc= 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=aYKL3EDM; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=DoZ/Rjz/; 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="aYKL3EDM"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="DoZ/Rjz/" From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1716791907; 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=02mlGKrKUI3gQEB07A6y9zFTpJYkffg7XWV4RkY45mg=; b=aYKL3EDMXfEN5u/BkUloG96mutWZq+ZZ3GeBeND/InbJGzc5EnHbsePE/NpwThihtR6Vhg puXFNVoM0uOPbwIfHvqs1ebeGgAqdw3VXdJWbBvQu4mpWqUZBg/d2tdnQmp2wfSgJcp2jZ NjYDP6n6gg9s9TvsxVBcStU0AZ1dZ7kJ+pKz1h/wUmzThq5VLmQLyaorznGhZaKDHhyVNe iq/Kbs6sC4YZsWOjXtW/GhQ9mGzCkC3Qd0wCHIIxPkuzrm1zqjvW9ouu/FWC88PMgW4txo H3OBJW7ehFmb9jaEcgF1m0AEjBwBPgVTS3zhu7Ds6SwiIA/SmEpwqxNqdmSjRw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1716791907; 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=02mlGKrKUI3gQEB07A6y9zFTpJYkffg7XWV4RkY45mg=; b=DoZ/Rjz/SfznAeRULibeob0mkM4fpJHPWg3TxM8CdhkJ8PfklVRabiYNlhirPCEGqarBwn 9ywtzurOjt4ZM3AQ== To: Petr Mladek Cc: Sergey Senozhatsky , Steven Rostedt , Thomas Gleixner , linux-kernel@vger.kernel.org, Andrew Morton , Arnd Bergmann , Lukas Wunner , Uros Bizjak , Kefeng Wang Subject: [PATCH printk v6 27/30] panic: Mark emergency section in warn Date: Mon, 27 May 2024 08:43:46 +0206 Message-Id: <20240527063749.391035-28-john.ogness@linutronix.de> In-Reply-To: <20240527063749.391035-1-john.ogness@linutronix.de> References: <20240527063749.391035-1-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 de8115c829cf..ee03193f9495 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