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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-06-19 21:00:54 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-06-19 21:01:03 +0000
commit62db400e83102695233497884d16a19c7e34fcd4 (patch)
tree62d1c1a2105118357e772c53c56478baf87bf946 /debian/patches-rt/0021-printk-Track-registered-boot-consoles.patch
parentMerging upstream version 6.9.2. (diff)
downloadlinux-62db400e83102695233497884d16a19c7e34fcd4.tar.xz
linux-62db400e83102695233497884d16a19c7e34fcd4.zip
Merging debian version 6.9.2-1~exp1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'debian/patches-rt/0021-printk-Track-registered-boot-consoles.patch')
-rw-r--r--debian/patches-rt/0021-printk-Track-registered-boot-consoles.patch79
1 files changed, 0 insertions, 79 deletions
diff --git a/debian/patches-rt/0021-printk-Track-registered-boot-consoles.patch b/debian/patches-rt/0021-printk-Track-registered-boot-consoles.patch
deleted file mode 100644
index 64ee0c4dbb..0000000000
--- a/debian/patches-rt/0021-printk-Track-registered-boot-consoles.patch
+++ /dev/null
@@ -1,79 +0,0 @@
-From: John Ogness <john.ogness@linutronix.de>
-Date: Tue, 24 Oct 2023 14:13:14 +0000
-Subject: [PATCH 21/48] printk: Track registered boot consoles
-Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.8/older/patches-6.8.2-rt11.tar.xz
-
-Unfortunately it is not known if a boot console and a regular
-(legacy or nbcon) console use the same hardware. For this reason
-they must not be allowed to print simultaneously.
-
-For legacy consoles this is not an issue because they are
-already synchronized with the boot consoles using the console
-lock. However nbcon consoles can be triggered separately.
-
-Add a global flag @have_boot_console to identify if any boot
-consoles are registered. This will be used in follow-up commits
-to ensure that boot consoles and nbcon consoles cannot print
-simultaneously.
-
-Signed-off-by: John Ogness <john.ogness@linutronix.de>
-Reviewed-by: Petr Mladek <pmladek@suse.com>
-Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
----
- kernel/printk/printk.c | 24 ++++++++++++++++++++++++
- 1 file changed, 24 insertions(+)
-
---- a/kernel/printk/printk.c
-+++ b/kernel/printk/printk.c
-@@ -463,6 +463,14 @@ static int console_msg_format = MSG_FORM
- /* syslog_lock protects syslog_* variables and write access to clear_seq. */
- static DEFINE_MUTEX(syslog_lock);
-
-+/*
-+ * 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
-+ * have mapped the same hardware.
-+ */
-+static bool have_boot_console;
-+
- #ifdef CONFIG_PRINTK
- DECLARE_WAIT_QUEUE_HEAD(log_wait);
- /* All 3 protected by @syslog_lock. */
-@@ -3518,6 +3526,9 @@ void register_console(struct console *ne
- newcon->seq = 0;
- }
-
-+ if (newcon->flags & CON_BOOT)
-+ have_boot_console = true;
-+
- /*
- * If another context is actively using the hardware of this new
- * console, it will not be aware of the nbcon synchronization. This
-@@ -3587,6 +3598,8 @@ EXPORT_SYMBOL(register_console);
- /* Must be called under console_list_lock(). */
- static int unregister_console_locked(struct console *console)
- {
-+ bool found_boot_con = false;
-+ struct console *c;
- int res;
-
- lockdep_assert_console_list_lock_held();
-@@ -3634,6 +3647,17 @@ static int unregister_console_locked(str
- if (console->exit)
- res = console->exit(console);
-
-+ /*
-+ * With this console gone, the global flags tracking registered
-+ * console types may have changed. Update them.
-+ */
-+ for_each_console(c) {
-+ if (c->flags & CON_BOOT)
-+ found_boot_con = true;
-+ }
-+ if (!found_boot_con)
-+ have_boot_console = found_boot_con;
-+
- return res;
- }
-