This is a note to let you know that I've just added the patch titled
printk: Rename abandon_console_lock_in_panic() to other_cpu_in_panic()
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
printk-rename-abandon_console_lock_in_panic-to-other.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e0733272398ba3fb0554624d185834193787a23f
Author: John Ogness <john.ogness@xxxxxxxxxxxxx>
Date: Mon Jul 17 21:52:07 2023 +0206
printk: Rename abandon_console_lock_in_panic() to other_cpu_in_panic()
[ Upstream commit 132a90d1527fedba2d95085c951ccf00dbbebe41 ]
Currently abandon_console_lock_in_panic() is only used to determine if
the current CPU should immediately release the console lock because
another CPU is in panic. However, later this function will be used by
the CPU to immediately release other resources in this situation.
Rename the function to other_cpu_in_panic(), which is a better
description and does not assume it is related to the console lock.
Signed-off-by: John Ogness <john.ogness@xxxxxxxxxxxxx>
Reviewed-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Reviewed-by: Petr Mladek <pmladek@xxxxxxxx>
Signed-off-by: Petr Mladek <pmladek@xxxxxxxx>
Link: https://lore.kernel.org/r/20230717194607.145135-8-john.ogness@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/kernel/printk/internal.h b/kernel/printk/internal.h
index 2a17704136f1d..7d4979d5c3ce6 100644
--- a/kernel/printk/internal.h
+++ b/kernel/printk/internal.h
@@ -103,3 +103,5 @@ struct printk_message {
u64 seq;
unsigned long dropped;
};
+
+bool other_cpu_in_panic(void);
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index d5e29fad84234..08a9419046b65 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2590,11 +2590,12 @@ static int console_cpu_notify(unsigned int cpu)
}
/*
- * Return true when this CPU should unlock console_sem without pushing all
- * messages to the console. This reduces the chance that the console is
- * locked when the panic CPU tries to use it.
+ * Return true if a panic is in progress on a remote CPU.
+ *
+ * On true, the local CPU should immediately release any printing resources
+ * that may be needed by the panic CPU.
*/
-static bool abandon_console_lock_in_panic(void)
+bool other_cpu_in_panic(void)
{
if (!panic_in_progress())
return false;
@@ -2621,7 +2622,7 @@ void console_lock(void)
might_sleep();
/* On panic, the console_lock must be left to the panic cpu. */
- while (abandon_console_lock_in_panic())
+ while (other_cpu_in_panic())
msleep(1000);
down_console_sem();
@@ -2643,7 +2644,7 @@ EXPORT_SYMBOL(console_lock);
int console_trylock(void)
{
/* On panic, the console_lock must be left to the panic cpu. */
- if (abandon_console_lock_in_panic())
+ if (other_cpu_in_panic())
return 0;
if (down_trylock_console_sem())
return 0;
@@ -2959,7 +2960,7 @@ static bool console_flush_all(bool do_cond_resched, u64 *next_seq, bool *handove
any_progress = true;
/* Allow panic_cpu to take over the consoles safely. */
- if (abandon_console_lock_in_panic())
+ if (other_cpu_in_panic())
goto abandon;
if (do_cond_resched)
