From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f42.google.com (mail-ej1-f42.google.com [209.85.218.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1268C12E4D for ; Tue, 27 Aug 2024 15:09:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.42 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724771384; cv=none; b=Xe9S3ynUI17FHU7ZyizzhJvZTnKHOgEtQJf2WRATh8FxTtklWbXHC+fqPXPdHSJhwuqHGYH4nulVeW4lZ3WsdsIKi2s3R+pF9+3nhpVLpzF5WWC/rmqoPrY9nicsb/HTvykL2DGJnfv2qJrgBOv7Ry/XMLR5R0qIZSePuICdKrg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724771384; c=relaxed/simple; bh=8QQYFgByboZVI9uam5soQpUvoDQc8v8XTD4OZr6CKNA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Nvgi6tlQcHHcZbpRW4hT3fFfi3JmTneYhCW6evYCq+hUUdangCfNNqKde6A1G3Z45HXFQq+2FTkEL5sxDf8GWfZmdXEDslThSehNwXTlwx7vM8KbkpMZlP1E4Nn/7cGtlvse0SHevQ2MIFzpnV1EotB5csTW6rlTKNOW6kD3EQE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com; spf=pass smtp.mailfrom=suse.com; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b=GGTp65Jn; arc=none smtp.client-ip=209.85.218.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b="GGTp65Jn" Received: by mail-ej1-f42.google.com with SMTP id a640c23a62f3a-a86910caf9cso914497766b.1 for ; Tue, 27 Aug 2024 08:09:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1724771380; x=1725376180; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=ASBDdEcwKzU9nr4gU62n0oyeSmxh9pUb9w3VtBSsSeY=; b=GGTp65JnftSViqB4tjk19KqpdX1eh+nMiQ/rFRB8qNLD0qgC1uwPG1BK9qifrDanaJ oDIt0fyWhtb4JwrjCoiXqeQCTeB/xeBtNPtUTOkLyfmVMFIuzQG7dQARwR69e3aZUqve mlZdwoil4Qf6t0L8oc3v2nAJcXOemkgYlKtBVMi6qTsb79CAiYFtAg/Xswnfosf/4BzX BtVC5TdvO1fL3KoQp1pWVfPl8dLI189gtmvMaih/Dj+G+fExjLArzpHij2Xs5VAK5GY5 sqtV/lAyuM1/w4psnDG/PW6DXQV4Ra90fsRKRQzyRP7mjTI/awGpn4ZOY+5ueENMyVvu QNuA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1724771380; x=1725376180; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=ASBDdEcwKzU9nr4gU62n0oyeSmxh9pUb9w3VtBSsSeY=; b=wbcy3lD/qX4uAD6JRf0uQZVlt7r1SOUL5See46AcfgBdsC6NHdbuJlWZXCDM6yI2r1 WTY3pEljSjSOBzaWAyLm7AS/Z7Nb2MtP4IulDVPSh26DEzEctjIAptkQDIEhya9SgJmQ bo7OyDs8oRNKiJ4/DJtnMd/8gm6e2SNWGn6dAR9RryziTZ/fvyif9cpGX3KmZaa+1qiS jb35ZGr0EchrplP4zVw1n5s1rraQDBUYbfDybseMaWPvigqqlslOiy6XVVMSNFJ4gGsB ruWJ8D9TawYIdxWHYJuT0wOB1a6tCO7uCuXeRC6zQqcgFHTQYkgvyXBy8HTMPwLO08O0 NE9w== X-Forwarded-Encrypted: i=1; AJvYcCVC21huU9DEw6msxLFCXnp8oZAxasqpJBT8pUcl971DW8H+95MGA7jao03KZ9wfTw0YxNcqAdeNkCT6Ji0=@vger.kernel.org X-Gm-Message-State: AOJu0Yy3HkFq4x3pi9CrMF+mlQzM/kSAsiB3teYxzLe7OVyYTQvQZ3AQ M27MutJZo/vwWhzcS5QmPUUsHTF5d9sJfq3mFHaigVvBIuFLuxCjLv9+sWqVLZU= X-Google-Smtp-Source: AGHT+IHCHMw5EQ4dCbgknMFgfAT0JKWSWlCq5BFMLg31mYsi30KIgWQ7BCxlZRlX2GEkHOP9h5syNQ== X-Received: by 2002:a17:907:7ea9:b0:a77:ca3b:996c with SMTP id a640c23a62f3a-a86e29a06ffmr349319466b.16.1724771380317; Tue, 27 Aug 2024 08:09:40 -0700 (PDT) Received: from pathway.suse.cz ([176.114.240.50]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a86e6c3314csm114816266b.178.2024.08.27.08.09.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Aug 2024 08:09:40 -0700 (PDT) Date: Tue, 27 Aug 2024 17:09:38 +0200 From: Petr Mladek To: John Ogness Cc: Sergey Senozhatsky , Steven Rostedt , Thomas Gleixner , linux-kernel@vger.kernel.org Subject: Re: [PATCH printk v4 08/17] printk: nbcon: Use thread callback if in task context for legacy Message-ID: References: <20240827044333.88596-1-john.ogness@linutronix.de> <20240827044333.88596-9-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-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240827044333.88596-9-john.ogness@linutronix.de> On Tue 2024-08-27 06:49:24, John Ogness wrote: > When printing via console_lock, the write_atomic() callback is > used for nbcon consoles. However, if it is known that the > current context is a task context, the write_thread() callback > can be used instead. > > Using write_thread() instead of write_atomic() helps to reduce > large disabled preemption regions when the device_lock does not > disable preemption. > > This is mainly a preparatory change to allow avoiding > write_atomic() completely during normal operation if boot > consoles are registered. > > As a side-effect, it also allows consolidating the printing > code for legacy printing and the kthread printer. > > Signed-off-by: John Ogness Reviewed-by: Petr Mladek Best Regards, Petr