6.5-stable review patch. If anyone has any objections, please let me know.
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From: John Ogness john.ogness@linutronix.de
[ 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@linutronix.de Reviewed-by: Sergey Senozhatsky senozhatsky@chromium.org Reviewed-by: Petr Mladek pmladek@suse.com Signed-off-by: Petr Mladek pmladek@suse.com Link: https://lore.kernel.org/r/20230717194607.145135-8-john.ogness@linutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/printk/internal.h | 2 ++ kernel/printk/printk.c | 15 ++++++++------- 2 files changed, 10 insertions(+), 7 deletions(-)
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)