69 lines
2.3 KiB
Diff
69 lines
2.3 KiB
Diff
|
From: John Ogness <john.ogness@linutronix.de>
|
||
|
|
Date: Tue, 20 Aug 2024 08:35:54 +0206
|
||
|
|
Subject: [PATCH 28/54] printk: Track nbcon consoles
|
||
|
|
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.11/older/patches-6.11-rt7.tar.xz
|
||
|
|
|
||
|
|
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 <john.ogness@linutronix.de>
|
||
|
|
Reviewed-by: Petr Mladek <pmladek@suse.com>
|
||
|
|
Link: https://lore.kernel.org/r/20240820063001.36405-29-john.ogness@linutronix.de
|
||
|
|
Signed-off-by: Petr Mladek <pmladek@suse.com>
|
||
|
|
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
||
|
|
---
|
||
|
|
kernel/printk/printk.c | 14 +++++++++++++-
|
||
|
|
1 file changed, 13 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
--- a/kernel/printk/printk.c
|
||
|
|
+++ b/kernel/printk/printk.c
|
||
|
|
@@ -471,6 +471,11 @@ static DEFINE_MUTEX(syslog_lock);
|
||
|
|
static bool have_legacy_console;
|
||
|
|
|
||
|
|
/*
|
||
|
|
+ * 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
|
||
|
|
* the console lock. This is because boot consoles and nbcon consoles may
|
||
|
|
@@ -3639,6 +3644,7 @@ void register_console(struct console *ne
|
||
|
|
init_seq = get_init_console_seq(newcon, bootcon_registered);
|
||
|
|
|
||
|
|
if (newcon->flags & CON_NBCON) {
|
||
|
|
+ have_nbcon_console = true;
|
||
|
|
nbcon_seq_force(newcon, init_seq);
|
||
|
|
} else {
|
||
|
|
have_legacy_console = true;
|
||
|
|
@@ -3719,6 +3725,7 @@ static int unregister_console_locked(str
|
||
|
|
{
|
||
|
|
bool use_device_lock = (console->flags & CON_NBCON) && console->write_atomic;
|
||
|
|
bool found_legacy_con = false;
|
||
|
|
+ bool found_nbcon_con = false;
|
||
|
|
bool found_boot_con = false;
|
||
|
|
unsigned long flags;
|
||
|
|
struct console *c;
|
||
|
|
@@ -3786,13 +3793,18 @@ static int unregister_console_locked(str
|
||
|
|
for_each_console(c) {
|
||
|
|
if (c->flags & CON_BOOT)
|
||
|
|
found_boot_con = true;
|
||
|
|
- if (!(c->flags & CON_NBCON))
|
||
|
|
+
|
||
|
|
+ if (c->flags & CON_NBCON)
|
||
|
|
+ found_nbcon_con = true;
|
||
|
|
+ else
|
||
|
|
found_legacy_con = true;
|
||
|
|
}
|
||
|
|
if (!found_boot_con)
|
||
|
|
have_boot_console = found_boot_con;
|
||
|
|
if (!found_legacy_con)
|
||
|
|
have_legacy_console = found_legacy_con;
|
||
|
|
+ if (!found_nbcon_con)
|
||
|
|
+ have_nbcon_console = found_nbcon_con;
|
||
|
|
|
||
|
|
return res;
|
||
|
|
}
|