From d01b42ede6603f7baf7976981415e3eed2c991ab Mon Sep 17 00:00:00 2001 From: John Ogness Date: Mon, 18 Sep 2023 20:27:41 +0000 Subject: [PATCH 137/184] lockdep: Mark emergency section in lockdep splats Mark an emergency section within print_usage_bug(), where lockdep bugs are printed. In this section, the CPU will not perform console output for the printk() calls. Instead, the console output will be flushed when exiting the emergency section. Signed-off-by: John Ogness Signed-off-by: Sebastian Andrzej Siewior --- kernel/locking/lockdep.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 9aca18312afb..5addb3c84261 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -56,6 +56,7 @@ #include #include #include +#include #include @@ -3972,6 +3973,8 @@ print_usage_bug(struct task_struct *curr, struct held_lock *this, if (!debug_locks_off() || debug_locks_silent) return; + nbcon_cpu_emergency_enter(); + pr_warn("\n"); pr_warn("================================\n"); pr_warn("WARNING: inconsistent lock state\n"); @@ -4000,6 +4003,8 @@ print_usage_bug(struct task_struct *curr, struct held_lock *this, pr_warn("\nstack backtrace:\n"); dump_stack(); + + nbcon_cpu_emergency_exit(); } /* -- 2.34.1