From nobody Sat Feb 7 06:11:04 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 82950208AD for ; Sun, 4 Aug 2024 00:51:55 +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=1722732717; cv=none; b=SZiBZPwqysLojJpygnq4iAiDlkQcztwwnaD3ZFq4ohBuobxK1DQB6X7VzzPFESlL3d2OiSf/xH411CKbDhPpBBwJ/7QcJz7bHHrf1N3EHEv5LL4Kzh3nP5p7el33bFlaU38FZz2vkBZEF76WAT16wjSb6TlGbZMekthGsY8lrtM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722732717; c=relaxed/simple; bh=/2k5Mbe/jx6LPirTRLARhhYIxJ772ebHt4mVYxVCiNs=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Xq5sUD7Pz8KKTd/95OiWPEgZ+2b0jW68d7xuapSK7N66SVsvrwkOUHnfNxIdL4Sw83mVPqLChm1PbsROo9sZ5/xJPwHXCZq9LPGDwwDP5c7NCrm1UpBf98qhcHM3rcNfUQgtSreJYNBHlyteTSw1hVGgmGnQUs2R8YShUqRKT+8= 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=U4KoX+7A; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=wizBu2AU; 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="U4KoX+7A"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="wizBu2AU" From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1722732711; 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=eWjvOXkPQNS41YYvNIgIKfsF4CC3vfaJOPzid1/Jwk0=; b=U4KoX+7ArHiL98yZdLI2t7wAOrKsYMaD7d8/HgS1xl5JAFKJA1qompgxDNBB+GtiSK94vA EBGSLSUVKPpkiW0W88amvAtedhTGSGNktsbBHl/3IiHh0Zt+UVSgqCFGd/ekjo7ONW+NBQ 5MPLPNcDXcufgR3U/idjk9LBZJ+MBJl+JgYS9rQyI/VRuypExmn6mIcmYlL0TNa/nHwrTr otskX/8d/oBwvs79dvxqSzs91Eq6o82pndxw+g0cCFORbbHbvll0AHda48rXDoiwyJ/wzq zRAOn5QbScI96ov5WG1Be0WcRkuIHbGLIVzqUM1qTmt4jaPqE4zfKXonnEaQZg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1722732711; 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=eWjvOXkPQNS41YYvNIgIKfsF4CC3vfaJOPzid1/Jwk0=; b=wizBu2AUYO8jnSUKBhQZowc5saL/7/opBTubvu1FiuVng1A4a89fTvLamUPMJj63KQSSrQ GGopMDGFP03xL7Dg== To: Petr Mladek Cc: Sergey Senozhatsky , Steven Rostedt , Thomas Gleixner , linux-kernel@vger.kernel.org Subject: [PATCH printk v7 28/35] printk: Track nbcon consoles Date: Sun, 4 Aug 2024 02:57:31 +0206 Message-Id: <20240804005138.3722656-29-john.ogness@linutronix.de> In-Reply-To: <20240804005138.3722656-1-john.ogness@linutronix.de> References: <20240804005138.3722656-1-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 a172c545e8dd..2277871e1f12 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 @@ -3638,6 +3643,7 @@ void register_console(struct console *newcon) init_seq =3D get_init_console_seq(newcon, bootcon_registered); =20 if (newcon->flags & CON_NBCON) { + have_nbcon_console =3D true; nbcon_seq_force(newcon, init_seq); } else { have_legacy_console =3D true; @@ -3718,6 +3724,7 @@ static int unregister_console_locked(struct console *= console) { bool use_device_lock =3D (console->flags & CON_NBCON) && console->write_a= tomic; bool found_legacy_con =3D false; + bool found_nbcon_con =3D false; bool found_boot_con =3D false; unsigned long flags; struct console *c; @@ -3785,13 +3792,18 @@ 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