diff options
Diffstat (limited to 'debian/patches-rt/0114-printk-Track-nbcon-consoles.patch')
| -rw-r--r-- | debian/patches-rt/0114-printk-Track-nbcon-consoles.patch | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/debian/patches-rt/0114-printk-Track-nbcon-consoles.patch b/debian/patches-rt/0114-printk-Track-nbcon-consoles.patch new file mode 100644 index 0000000000..fb85c5bbb5 --- /dev/null +++ b/debian/patches-rt/0114-printk-Track-nbcon-consoles.patch @@ -0,0 +1,67 @@ +From: John Ogness <john.ogness@linutronix.de> +Date: Mon, 11 Dec 2023 09:36:52 +0000 +Subject: [PATCH 114/134] printk: Track nbcon consoles +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.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> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + kernel/printk/printk.c | 16 +++++++++++++++- + 1 file changed, 15 insertions(+), 1 deletion(-) + +--- a/kernel/printk/printk.c ++++ b/kernel/printk/printk.c +@@ -471,6 +471,13 @@ static DEFINE_MUTEX(syslog_lock); + bool have_legacy_console; + + /* ++ * Specifies if an nbcon console is registered. If nbcon consoles are present, ++ * synchronous printing of legacy consoles will not occur during panic until ++ * the backtrace has been stored to the ringbuffer. ++ */ ++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 +@@ -3523,6 +3530,7 @@ void register_console(struct console *ne + console_init_seq(newcon, bootcon_registered); + + if (newcon->flags & CON_NBCON) { ++ have_nbcon_console = true; + nbcon_init(newcon); + } else { + have_legacy_console = true; +@@ -3584,6 +3592,7 @@ EXPORT_SYMBOL(register_console); + static int unregister_console_locked(struct console *console) + { + bool found_legacy_con = false; ++ bool found_nbcon_con = false; + bool found_boot_con = false; + struct console *c; + int res; +@@ -3640,13 +3649,18 @@ 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 = false; + if (!found_legacy_con) + have_legacy_console = false; ++ if (!found_nbcon_con) ++ have_nbcon_console = false; + + return res; + } |