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 7115CC4167D for ; Thu, 2 Nov 2023 16:22:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376911AbjKBQWz (ORCPT ); Thu, 2 Nov 2023 12:22:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52900 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344919AbjKBQWx (ORCPT ); Thu, 2 Nov 2023 12:22:53 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 713F8137 for ; Thu, 2 Nov 2023 09:22:47 -0700 (PDT) Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out1.suse.de (Postfix) with ESMTP id 02108218A9; Thu, 2 Nov 2023 16:22:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1698942166; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=GnHfnbxRW6xCASM+FghP5ql9o3nJhCS/JsgSRYW7wTg=; b=O/VU74RFkrUSN7aTui1xuUmqQdRpSycdS/nvysJF25G+mo+kET34FGNyVZ/ZnEW1EDQJos /buIPAUCXGsNGeEPyah6x42AzFIbipKmA/x3mYin8uw5B0JN/CIOJ8RqdHTekw/F77Ao3k Tt31BTKLbkFaLWcfM9w38cx56GJIo7s= Received: from suse.cz (pmladek.udp.ovpn2.prg.suse.de [10.100.201.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by relay2.suse.de (Postfix) with ESMTPS id 362F22D42D; Thu, 2 Nov 2023 16:22:45 +0000 (UTC) Date: Thu, 2 Nov 2023 17:22:45 +0100 From: Petr Mladek To: Linus Torvalds Cc: Sergey Senozhatsky , Steven Rostedt , John Ogness , Andy Shevchenko , Rasmus Villemoes , Sebastian Andrzej Siewior , Thomas Gleixner , Jan Kara , Peter Zijlstra , linux-kernel@vger.kernel.org Subject: [GIT PULL] printk for 6.7 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Linus, please pull the latest printk changes from git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux.git tags/printk-for-6.7 ================================ - Another preparation step for introducing printk kthreads. The main piece is a per-console lock with several features: - Support three priorities: normal, emergency, and panic. They will be defined by a context where the lock is taken. A context with a higher priority is allowed to take over the lock from a context with a lower one. The plan is to use the emergency context for Oops and WARN() messages, and also by watchdogs. The panic() context will be used on panic CPU. - The owner might enter/exit regions where it is not safe to take over the lock. It allows the take over the lock a safe way in the middle of a message. For example, serial drivers emit characters one by one. And the serial port is in a safe state in between. Only the final console_flush_in_panic() will be allowed to take over the lock even in the unsafe state (last chance, pray, and hope). - A higher priority context might busy wait with a timeout. The current owner is informed about the waiter and releases the lock on exit from the unsafe state. - The new lock is safe even in atomic contexts, including NMI. Another change is a safe manipulation of per-console sequence number counter under the new lock. - simple_strntoull() micro-optimization - Reduce pr_flush() pooling time. - Calm down false warning about possible buffer invalid access to console buffers when CONFIG_PRINTK is disabled. ---------------------------------------------------------------- Alexey Dobriyan (1): vsprintf: uninline simple_strntoull(), reorder arguments John Ogness (3): printk: Make static printk buffers available to nbcon printk: fix illegal pbufs access for !CONFIG_PRINTK printk: flush consoles before checking progress Li kunyu (1): printk: printk: Remove unnecessary statements＇len = 0;＇ Petr Mladek (5): Merge branch 'rework/misc-cleanups' into for-linus printk: Reduce pr_flush() pooling time Merge branch 'for-6.7' into for-linus Merge branch 'rework/misc-cleanups' into for-linus Merge branch 'rework/nbcon-base' into for-linus Thomas Gleixner (7): printk: Add non-BKL (nbcon) console basic infrastructure printk: nbcon: Add acquire/release logic printk: nbcon: Add buffer management printk: nbcon: Add ownership state functions printk: nbcon: Add sequence handling printk: nbcon: Add emit function and callback function for atomic printing printk: nbcon: Allow drivers to mark unsafe regions and check state include/linux/console.h | 129 ++++++ kernel/printk/Makefile | 2 +- kernel/printk/internal.h | 31 ++ kernel/printk/nbcon.c | 1029 ++++++++++++++++++++++++++++++++++++++++++++++ kernel/printk/printk.c | 158 ++++--- lib/vsprintf.c | 25 +- 6 files changed, 1295 insertions(+), 79 deletions(-) create mode 100644 kernel/printk/nbcon.c