From: Petr Mladek <pmladek@suse.com>
To: John Ogness <john.ogness@linutronix.de>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org>,
Waiman Long <longman@redhat.com>,
Boqun Feng <boqun.feng@gmail.com>
Subject: Re: [PATCH printk v2 11/11] lockdep: Add atomic write enforcement for lockdep splats
Date: Fri, 29 Sep 2023 10:31:41 +0200 [thread overview]
Message-ID: <ZRaLbUHStnPAGAjR@alley> (raw)
In-Reply-To: <20230919230856.661435-12-john.ogness@linutronix.de>
On Wed 2023-09-20 01:14:56, John Ogness wrote:
> Invoke the atomic write enforcement functions for lockdep
> splats to ensure that the information gets out to the consoles.
>
> --- a/kernel/locking/lockdep.c
> +++ b/kernel/locking/lockdep.c
> @@ -3967,9 +3968,13 @@ static void
> print_usage_bug(struct task_struct *curr, struct held_lock *this,
> enum lock_usage_bit prev_bit, enum lock_usage_bit new_bit)
> {
> + enum nbcon_prio prev_prio;
> +
> if (!debug_locks_off() || debug_locks_silent)
> return;
>
> + prev_prio = nbcon_atomic_enter(NBCON_PRIO_EMERGENCY);
> +
> pr_warn("\n");
> pr_warn("================================\n");
> pr_warn("WARNING: inconsistent lock state\n");
> @@ -3998,6 +4003,8 @@ print_usage_bug(struct task_struct *curr, struct held_lock *this,
>
> pr_warn("\nstack backtrace:\n");
> dump_stack();
> +
> + nbcon_atomic_exit(NBCON_PRIO_EMERGENCY, prev_prio);
> }
The location of the emergency context looks good. I have just proposed
another way for tracking the emergency context. It would allow to
call nbcon_emergency_enter()/exit() without any parameter,
see https://lore.kernel.org/r/ZRLBxsXPCym2NC5Q@alley
Best Regards,
Petr
prev parent reply other threads:[~2023-09-29 8:32 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-19 23:08 [PATCH printk v2 00/11] wire up nbcon atomic printing John Ogness
2023-09-19 23:08 ` [PATCH printk v2 01/11] printk: Make console_is_usable() available to nbcon John Ogness
2023-09-22 8:33 ` Petr Mladek
2023-09-19 23:08 ` [PATCH printk v2 02/11] printk: Let console_is_usable() handle nbcon John Ogness
2023-09-22 8:37 ` Petr Mladek
2023-09-19 23:08 ` [PATCH printk v2 03/11] printk: Add @flags argument for console_is_usable() John Ogness
2023-09-22 8:41 ` Petr Mladek
2023-09-19 23:08 ` [PATCH printk v2 04/11] printk: nbcon: Provide functions to mark atomic write sections John Ogness
2023-09-22 9:33 ` Petr Mladek
2023-09-25 9:25 ` John Ogness
2023-09-25 16:04 ` Petr Mladek
2023-10-05 12:51 ` John Ogness
2023-10-06 12:51 ` panic context: was: " Petr Mladek
2023-10-06 12:53 ` Petr Mladek
2023-10-08 10:13 ` John Ogness
2023-10-09 15:32 ` Petr Mladek
2023-10-10 16:02 ` John Ogness
2023-10-16 8:58 ` Dave Young
2023-10-16 10:09 ` John Ogness
2023-10-06 15:52 ` Petr Mladek
2023-09-19 23:08 ` [PATCH printk v2 05/11] printk: nbcon: Provide function for atomic flushing John Ogness
2023-09-22 12:32 ` Petr Mladek
2023-09-25 11:11 ` John Ogness
2023-09-19 23:08 ` [PATCH printk v2 06/11] printk: nbcon: Wire up nbcon console " John Ogness
2023-09-22 17:41 ` Petr Mladek
2023-09-25 13:37 ` John Ogness
2023-09-26 12:14 ` Petr Mladek
2023-10-05 13:59 ` John Ogness
2023-09-19 23:08 ` [PATCH printk v2 07/11] printk: nbcon: Wire up nbcon into console_flush_all() John Ogness
2023-09-26 11:34 ` Petr Mladek
2023-09-19 23:08 ` [PATCH printk v2 08/11] panic: Add atomic write enforcement to warn/panic John Ogness
2023-09-27 12:02 ` Petr Mladek
2023-09-19 23:08 ` [PATCH printk v2 09/11] panic: Add atomic write enforcement to oops John Ogness
2023-09-19 23:36 ` John Ogness
2023-09-20 13:28 ` Andy Shevchenko
2023-09-20 14:20 ` John Ogness
2023-09-20 14:45 ` Andy Shevchenko
2023-09-27 13:15 ` Petr Mladek
2023-09-19 23:08 ` [PATCH printk v2 10/11] rcu: Add atomic write enforcement for rcu stalls John Ogness
2023-09-27 15:00 ` Petr Mladek
2023-09-19 23:08 ` [PATCH printk v2 11/11] lockdep: Add atomic write enforcement for lockdep splats John Ogness
2023-09-29 8:31 ` Petr Mladek [this message]
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