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Thu, 20 Nov 2025 02:05:38 -0800 (PST) Received: from pathway.suse.cz ([176.114.240.130]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b7654ff3962sm171764766b.50.2025.11.20.02.05.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Nov 2025 02:05:37 -0800 (PST) Date: Thu, 20 Nov 2025 11:05:35 +0100 From: Petr Mladek To: Chris Down Cc: linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Sergey Senozhatsky , Steven Rostedt , John Ogness , Geert Uytterhoeven , Tony Lindgren , kernel-team@fb.com Subject: Re: [PATCH v7 06/13] printk: Support toggling per-console loglevel via syslog() and cmdline Message-ID: References: <1c368ffff850a00b81d4b67c15c38b826251e27d.1763492585.git.chris@chrisdown.name> 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: <1c368ffff850a00b81d4b67c15c38b826251e27d.1763492585.git.chris@chrisdown.name> On Wed 2025-11-19 03:07:22, Chris Down wrote: > A new module parameter (ignore_per_console_loglevel) is added, which can > be set via the kernel command line or at runtime through > /sys/module/printk/parameters/ignore_per_console_loglevel. When set, the > per-console loglevels are ignored, and the global console loglevel > (console_loglevel) is used for all consoles. > > During sysrq, we temporarily disable per-console loglevels to ensure all > requisite messages are printed to the console. This is necessary because > sysrq is often used in dire circumstances where access to > /sys/class/console may not be trivially possible. > > Additionally, the syslog actions SYSLOG_ACTION_CONSOLE_ON and > SYSLOG_ACTION_CONSOLE_OFF are augmented to save and restore the state of > ignore_per_console_loglevel. This allows administrators to enable or > disable per-console loglevels dynamically using the syslog() system > call, as supported in userspace by things like dmesg. > > This is useful when debugging issues with message emission, or when > needing to quickly break glass and revert to global loglevel only. > > Signed-off-by: Chris Down Looks good to me: Reviewed-by: Petr Mladek Best Regards, Petr