From nobody Tue Dec 2 02:41:47 2025 Received: from mail-pl1-f181.google.com (mail-pl1-f181.google.com [209.85.214.181]) (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 75EBB30C601 for ; Tue, 18 Nov 2025 19:07:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763492836; cv=none; b=utXGSDA1sIvQsnFoMJXzdOZpbMExViXqm0T8uQilPduEEM+oBsNbZWFcx82gtQ40N0ZtVVr++3X46jrp90QxF6sVqYTHftuvUTDhPMexQ/DIicYe1TC5NsclefYEuhTZo4iHB6FRFkeOtFWwEoMX6j0Yq5hv9+yjLwpQV7Kctwk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763492836; c=relaxed/simple; bh=DM4Rsh00uOMahlI77s4+jULSF4hwa42Y/OVFP30/iJk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=R7pIRXBJ8deo4zZeE0A7m8t8Y0XEk4aqL7xtH/sukN+uzBgLOKAYdTe9B6UJ2rBRixseIzTgBembigOYGBdU9cpESmTX+S6foaKzQTSeGQeSeIycjzs2WLvHdWOfykIZ4B6yCbgl2nOFtpTC49L1b27ubvRdzCnoUm7aziMhAz0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=chrisdown.name; spf=pass smtp.mailfrom=chrisdown.name; dkim=pass (1024-bit key) header.d=chrisdown.name header.i=@chrisdown.name header.b=buUYwnLK; arc=none smtp.client-ip=209.85.214.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=chrisdown.name Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chrisdown.name Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chrisdown.name header.i=@chrisdown.name header.b="buUYwnLK" Received: by mail-pl1-f181.google.com with SMTP id d9443c01a7336-29558061c68so68511685ad.0 for ; Tue, 18 Nov 2025 11:07:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chrisdown.name; s=google; t=1763492834; x=1764097634; darn=vger.kernel.org; h=user-agent: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=7w23/gxbhgAeaCdz9QEozAtVsIwOWUg75eHcu4ZwLfs=; b=buUYwnLK/xXCOS7fTT4+V03rXNuHFDUiZDV8S2Y+yHI3rKpC9+bBHUrqs7VIeJ8pre z2zPO9YtzERJ+e6Dd9edg5HcrzcETY/K2JU9ExGjl3j6py8jzme9IIwIfqDdzOFY/itw 869zinF+mXZJ4uIYiDvA7VWE29TKEEb/mffT8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763492834; x=1764097634; h=user-agent:in-reply-to:content-disposition:mime-version:references :message-id:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=7w23/gxbhgAeaCdz9QEozAtVsIwOWUg75eHcu4ZwLfs=; b=on1YIbmWQonEboq4NYhroful8NNgn354ZUdCgMNQ+5E6ue3l1hM1LPmGNSzywYdzmS WoWdv0np1pInQkHY11Ph+VBHi5PYknjBw1vb4EkNo8E8D47TaWjzAkIQLKFfRW5SNI3g etPrWpLbV+Tyzrqr/T51yPlIwycoGk0TuU4Os8L0djd6bGlORSgktSvnKUW0nQfdyghq OHNbIBJ7FyoR3aFFojOeOnag0FfINtGlPOqtdcmGElEG6Sb0fv5Lf8Qy0WNLmslVpZoo duIOY3+NkckWDj6DnkkO7ncvOp9HJaLa7OdutgI5wWrZxOPc9Zx1EWP5BcwkSyXH+7nn oqvw== X-Gm-Message-State: AOJu0YzP15NykjAXTgI3AxM/8/WgFGudPmPhdaPbTX2OO9itvQzinvmv m7fqfjlalZpNlGpeXZJijRmf9RvERW9IoSnhSVJOJzdE+ORYKe2UmKy8ZWAAMYLXyRA= X-Gm-Gg: ASbGncueBfIbqTsEnpBL8A0Itfzn1Mn1+M4QBGRbWiZFD3Q7LuXySaIOlgaHdjemRUO UZukTmwaZYvXs6h/mCOzy30/srkrtsmfNaByLZdbdwB45Y15u5TafB+H40zVzP9iwuELSy7GOaq kHNF2thNtkL7IsY/O8cCWRJZ4dCj6z77AcN+ijLPyxJrrCxm8AouVqL5APD2L3DrQiguy/1mjaB 2UmUA2tUPM7Y55dxVdmxr/DsWKs790kWbkNNbdd8ZQjaVLDthfloHTe9qzILtpTi0n1BC96Npai 8JfUqNF/XjdERYiN2kMvnSm1S0r/5D8XQw7KNap+IpqQG6irKzL7WfiNXVvt75fijPgdBIWfeev PHLJ/j1f6rppd7Y4oHdc3VRVkT3/jUcVQzWA/eeYRp9XE5STTJAsICxVZeXZux4V6DXLljQrU2m Yqap1iwr7i X-Google-Smtp-Source: AGHT+IFFlqxwQAND+MQlamI3f7hPFF3Clj7ilbDnRtwby2AvpQ5cBl9jC7lC5VagvmpwxoOwaFfwQA== X-Received: by 2002:a17:903:2409:b0:298:4ee2:19f3 with SMTP id d9443c01a7336-29a054c1d3fmr957385ad.49.1763492833653; Tue, 18 Nov 2025 11:07:13 -0800 (PST) Received: from localhost ([116.86.198.140]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2985c2bf158sm183369615ad.91.2025.11.18.11.07.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Nov 2025 11:07:13 -0800 (PST) Date: Wed, 19 Nov 2025 03:07:11 +0800 From: Chris Down To: Petr Mladek Cc: linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Sergey Senozhatsky , Steven Rostedt , John Ogness , Geert Uytterhoeven , Tony Lindgren , kernel-team@fb.com Subject: [PATCH v7 04/13] printk: Ignore per-console loglevel in sysrq Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/2.2.15 (2b349c5e) (2025-10-02) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When the global console loglevel is changed via sysrq, clear any per-console loglevels that may have been set. This ensures that the sysrq loglevel change takes effect immediately across all consoles. Warn once if any per-console loglevels were being overridden. Signed-off-by: Chris Down Reviewed-by: Petr Mladek --- drivers/tty/sysrq.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c index 97f8a9a52285..1763eaefd581 100644 --- a/drivers/tty/sysrq.c +++ b/drivers/tty/sysrq.c @@ -51,6 +51,7 @@ #include #include #include +#include =20 #include #include @@ -101,10 +102,25 @@ __setup("sysrq_always_enabled", sysrq_always_enabled_= setup); static void sysrq_handle_loglevel(u8 key) { u8 loglevel =3D key - '0'; + int cookie; + struct console *con; =20 console_loglevel =3D CONSOLE_LOGLEVEL_DEFAULT; pr_info("Loglevel set to %u\n", loglevel); console_loglevel =3D loglevel; + + /* + * When changing loglevel via sysrq, override all per-console loglevels + * to ensure the new global loglevel takes effect immediately and all + * consoles see the messages. + */ + cookie =3D console_srcu_read_lock(); + for_each_console_srcu(con) { + if (has_per_console_loglevel(con)) + pr_warn_once("Overriding per-console loglevel from sysrq\n"); + WRITE_ONCE(con->level, LOGLEVEL_DEFAULT); + } + console_srcu_read_unlock(cookie); } static const struct sysrq_key_op sysrq_loglevel_op =3D { .handler =3D sysrq_handle_loglevel, --=20 2.51.2