From nobody Mon Feb 9 19:25:32 2026 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 2F756161319 for ; Tue, 2 Apr 2024 22:11:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712095908; cv=none; b=GWMC3Stuy0gwouKY/0+JL0uBpT1H5uBY1Rgztu4bW30hsvU1oXsFY0IfQ8lkdCFj1s61/TgD8kx1yiJhLA2fVLwZsZP0YUGvXOpT/Nn3JZTZnAqNZ2fBUgEtatEFbiPeDrSQWzJC5hfMUvMcGjEyMAphZbYSdMjRHjkJ8iFA6gg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712095908; c=relaxed/simple; bh=ea/VSkLziN3LfF9dxUVRYcPw9vAR9EyCyVl6lSgqECM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Rbj1H0VFO5G9/Aympyssufpy/+LX7OrT7/t014D/MfI614KghFKm9o7Uhst1G5gIMVNJ+oYxPZwq3pGXemWBV86dr2DHRxwKzJmmfWJvXeOcVg2gf+4x6qLh4zN4gzNVwwn2yWVE3j9QGuL+N+mPOVQGglS6CY8TrzFIi35f4rg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=2CniPFW5; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=6lH22voz; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="2CniPFW5"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="6lH22voz" From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1712095905; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=kU8IWDIJKFpfEhPU59onSvKonMZgsk+kpNnh+HiGC7g=; b=2CniPFW5uube6TVk/d4kn8aPetcO9M/ExOy5ajsCLwBPl2HmcSKqE3ZA8CQXP0ElT/9UxX +TDC9kGLNP8VpmVHzTD5TUHcR3ILVXsvgbQRza0NJDCA2AjjR1LzKvKJeLIB2EuSKrr2eD mzCQe1XjoCiwM9pLiVivKzwA//T+LO/sakSEnvS0q5drpajBJBGct+J4SLp2fcPpJkS7pL R6spksFUYbCsCc7za+P0fCcMBC2OQw8oQtnhFun31IzitFzCMmTmPF/qKEowm3GeHzj0WT Sqhw++EskvWGYComVoH4xy+kfZ9ZntgVXkLkVj0pbUx3Jq680qP65I+tp0Yivw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1712095905; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=kU8IWDIJKFpfEhPU59onSvKonMZgsk+kpNnh+HiGC7g=; b=6lH22vozQipEEMG2qPHiu4Si6m5fdkfeSaV+42aQXUsVLnHsTryadC8rRPLQH9ISaDg0al R6yNebYJCDkAltDg== To: Petr Mladek Cc: Sergey Senozhatsky , Steven Rostedt , Thomas Gleixner , linux-kernel@vger.kernel.org Subject: [PATCH printk v4 21/27] printk: Track nbcon consoles Date: Wed, 3 Apr 2024 00:17:23 +0206 Message-Id: <20240402221129.2613843-22-john.ogness@linutronix.de> In-Reply-To: <20240402221129.2613843-1-john.ogness@linutronix.de> References: <20240402221129.2613843-1-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-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a global flag @have_nbcon_console to identify if any nbcon consoles are registered. This will be used in follow-up commits to preserve legacy behavior when no nbcon consoles are registered. Signed-off-by: John Ogness Reviewed-by: Petr Mladek --- kernel/printk/printk.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 4ff3800e8e8e..329b8507f8a0 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -470,6 +470,11 @@ static DEFINE_MUTEX(syslog_lock); */ static bool have_legacy_console; =20 +/* + * Specifies if an nbcon console is registered. + */ +static bool have_nbcon_console; + /* * Specifies if a boot console is registered. If boot consoles are present, * nbcon consoles cannot print simultaneously and must be synchronized by @@ -3533,6 +3538,7 @@ void register_console(struct console *newcon) console_init_seq(newcon, bootcon_registered); =20 if (newcon->flags & CON_NBCON) { + have_nbcon_console =3D true; nbcon_init(newcon); =20 /* @@ -3619,6 +3625,7 @@ EXPORT_SYMBOL(register_console); static int unregister_console_locked(struct console *console) { bool found_legacy_con =3D false; + bool found_nbcon_con =3D false; bool found_boot_con =3D false; struct console *c; int res; @@ -3675,13 +3682,18 @@ static int unregister_console_locked(struct console= *console) for_each_console(c) { if (c->flags & CON_BOOT) found_boot_con =3D true; - if (!(c->flags & CON_NBCON)) + + if (c->flags & CON_NBCON) + found_nbcon_con =3D true; + else found_legacy_con =3D true; } if (!found_boot_con) have_boot_console =3D found_boot_con; if (!found_legacy_con) have_legacy_console =3D found_legacy_con; + if (!found_nbcon_con) + have_nbcon_console =3D found_nbcon_con; =20 return res; } --=20 2.39.2