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https://github.com/OpenVoiceOS/OpenVoiceOS
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73 lines
2.2 KiB
Diff
73 lines
2.2 KiB
Diff
From 72e9bda6af8eb46bceb4658c4cf10b0446ae964a Mon Sep 17 00:00:00 2001
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From: John Ogness <john.ogness@linutronix.de>
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Date: Mon, 11 Dec 2023 09:36:52 +0000
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Subject: [PATCH 141/195] printk: Track nbcon consoles
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Add a global flag @have_nbcon_console to identify if any nbcon
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consoles are registered. This will be used in follow-up commits
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to preserve legacy behavior when no nbcon consoles are registered.
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Signed-off-by: John Ogness <john.ogness@linutronix.de>
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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kernel/printk/printk.c | 16 +++++++++++++++-
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1 file changed, 15 insertions(+), 1 deletion(-)
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diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
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index 26958c8b2810..e84da28db173 100644
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--- a/kernel/printk/printk.c
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+++ b/kernel/printk/printk.c
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@@ -470,6 +470,13 @@ static DEFINE_MUTEX(syslog_lock);
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*/
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bool have_legacy_console;
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+/*
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+ * Specifies if an nbcon console is registered. If nbcon consoles are present,
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+ * synchronous printing of legacy consoles will not occur during panic until
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+ * the backtrace has been stored to the ringbuffer.
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+ */
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+bool have_nbcon_console;
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+
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/*
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* Specifies if a boot console is registered. If boot consoles are present,
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* nbcon consoles cannot print simultaneously and must be synchronized by
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@@ -3523,6 +3530,7 @@ void register_console(struct console *newcon)
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console_init_seq(newcon, bootcon_registered);
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if (newcon->flags & CON_NBCON) {
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+ have_nbcon_console = true;
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nbcon_init(newcon);
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} else {
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have_legacy_console = true;
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@@ -3584,6 +3592,7 @@ EXPORT_SYMBOL(register_console);
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static int unregister_console_locked(struct console *console)
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{
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bool found_legacy_con = false;
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+ bool found_nbcon_con = false;
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bool found_boot_con = false;
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struct console *c;
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int res;
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@@ -3640,13 +3649,18 @@ static int unregister_console_locked(struct console *console)
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for_each_console(c) {
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if (c->flags & CON_BOOT)
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found_boot_con = true;
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- if (!(c->flags & CON_NBCON))
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+
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+ if (c->flags & CON_NBCON)
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+ found_nbcon_con = true;
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+ else
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found_legacy_con = true;
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}
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if (!found_boot_con)
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have_boot_console = false;
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if (!found_legacy_con)
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have_legacy_console = false;
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+ if (!found_nbcon_con)
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+ have_nbcon_console = false;
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return res;
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}
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--
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2.43.0
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