Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | From | John Ogness <> | Subject | [PATCH printk v2 26/26] lockdep: Mark emergency section in lockdep splats | Date | Sun, 18 Feb 2024 20:03:26 +0106 |
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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, a flushing of the console output is triggered when exiting the emergency section.
Signed-off-by: John Ogness <john.ogness@linutronix.de> --- kernel/locking/lockdep.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index e85b5ad3e206..00465373d358 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -56,6 +56,7 @@ #include <linux/kprobes.h> #include <linux/lockdep.h> #include <linux/context_tracking.h> +#include <linux/console.h> #include <asm/sections.h> @@ -3970,6 +3971,8 @@ 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"); @@ -3998,6 +4001,8 @@ print_usage_bug(struct task_struct *curr, struct held_lock *this, pr_warn("\nstack backtrace:\n"); dump_stack(); + + nbcon_cpu_emergency_exit(); } /* -- 2.39.2
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