From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ms.lwn.net (ms.lwn.net [45.79.88.28]) (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 80ED843147; Tue, 9 Jul 2024 15:00:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.79.88.28 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720537217; cv=none; b=ZOK9AH2dP2kA8ogKtOUa90aFMyfoE2khNa2Tw87wx3ZBDgizO3KYzrWycQqamebS/xk5SMripPZelXvCXEisD3qIgvl4K+rEcSoT6Pvm9f72x2HfA3vhLwmgYocvDYd5l44jYAU8Eni1rGpyhYChO4htyIrwc0QfUqNmgUpsoDI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720537217; c=relaxed/simple; bh=JiW69Fz66dH9tgT9IJ3kGFv2cPDr8WCP9lwPp3BIadc=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=MiXu+FTHjaAOuRjQsu41/Ewvvy4fST3tZGdojmjaUFTFozfhDiZH0EC5MKBtHco6G4YUOL0YgpgF6DGFCdf+xETuMgamwcIY0FLCnwRSmHuHa+jmEyWMHnmyYPHLl/KPNxNUeVgGbtYztfgjIHPZCikVWOvcvcaCgwelFFG3SGw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lwn.net; spf=pass smtp.mailfrom=lwn.net; dkim=pass (2048-bit key) header.d=lwn.net header.i=@lwn.net header.b=XTIoUTUC; arc=none smtp.client-ip=45.79.88.28 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=lwn.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lwn.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lwn.net header.i=@lwn.net header.b="XTIoUTUC" DKIM-Filter: OpenDKIM Filter v2.11.0 ms.lwn.net 9E13141A36 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lwn.net; s=20201203; t=1720537215; bh=w7U51+W3a2iY26LqogPIRTKUQM3cm8SRY2qgrigSplU=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=XTIoUTUC9LA0ptJLnNBtG+uS7FLx3uNQtp5V4uyJCqyKfBXZJiSPmpNh3aUtVKLR5 A0/XOVQPYab/TFQT5mEEcdlJM855FZcpqXnfrI8I18kj3e9HDZ2vWKvPl7+ACOfPBP lKfJkwINRudB0kWkXBDcHf78dPRcU+4gL5HDnkP8FlxagtDt2iYyTxKoxwSbOxAlc1 HVAYYPueN415heiHNWU6Yw1eeBGStuk7clPQKxTZ9DmlBOzYusvyPFKRzo+emvvi4z S9FxXExmlu+On/WOU75E9KORRoCu2uvDItHHSGwafOxrfeXLA6E/eI61JaQK8V+ZXh LYcKsRS8b/jbA== Received: from localhost (unknown [IPv6:2601:280:5e00:625::1fe]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by ms.lwn.net (Postfix) with ESMTPSA id 9E13141A36; Tue, 9 Jul 2024 15:00:15 +0000 (UTC) From: Jonathan Corbet To: Daniel Lublin Cc: Daniel Lublin , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] Documentation: add reference from dynamic debug to loglevel kernel params In-Reply-To: <4633bdb82c1c7c014d79840887878624a55c59f8.1720533043.git.daniel@lublin.se> References: <4633bdb82c1c7c014d79840887878624a55c59f8.1720533043.git.daniel@lublin.se> Date: Tue, 09 Jul 2024 09:00:14 -0600 Message-ID: <87plrm8vb5.fsf@trenco.lwn.net> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Daniel Lublin writes: > This is useful information for somebody who has managed to dig into > enabling debug output, but is wondering why there is no such output > appearing on the console. > > Signed-off-by: Daniel Lublin > --- > Documentation/admin-guide/dynamic-debug-howto.rst | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst > index 0e9b48daf690..7c036590cd07 100644 > --- a/Documentation/admin-guide/dynamic-debug-howto.rst > +++ b/Documentation/admin-guide/dynamic-debug-howto.rst > @@ -26,6 +26,11 @@ Dynamic debug provides: > - format string > - class name (as known/declared by each module) > > +NOTE: To actually get the debug-print output on the console, you may > +need to adjust the kernel ``loglevel=``, or use ``ignore_loglevel``. > +Read about these kernel parameters in > +Documentation/admin-guide/kernel-parameters.rst. > + I've applied this, thanks. jon