linux-kernel - Re: [PATCH] lockdep: Use info level for lockdep initial info messages

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Message-ID: <ZwcHitGNM0cDG5M5@boqun-archlinux>
Date: Wed, 9 Oct 2024 15:45:30 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Waiman Long <llong@...hat.com>
Cc: "Jiri Slaby (SUSE)" <jirislaby@...nel.org>, mingo@...nel.org,
	linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH] lockdep: Use info level for lockdep initial info messages

On Mon, Oct 07, 2024 at 09:05:25AM -0400, Waiman Long wrote:
> On 10/7/24 2:54 AM, Jiri Slaby (SUSE) wrote:
> > All those:
> >   Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
> >   ... MAX_LOCKDEP_SUBCLASSES:  8
> >   ... MAX_LOCK_DEPTH:          48
> >   ... MAX_LOCKDEP_KEYS:        8192
> > and so on are dumped with the KERN_WARNING level. It is due to missing
> > KERN_* annotation.
> > 
> > Use pr_info() instead of bare print() to dump the info with the info
> > level.
> > 
> > Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Will Deacon <will@...nel.org>
> > Cc: Waiman Long <longman@...hat.com>
> > Cc: Boqun Feng <boqun.feng@...il.com>
> > ---
> >   kernel/locking/lockdep.c | 22 +++++++++++-----------
> >   1 file changed, 11 insertions(+), 11 deletions(-)
> > 
> > diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
> > index 536bd471557f..ae8750157099 100644
> > --- a/kernel/locking/lockdep.c
> > +++ b/kernel/locking/lockdep.c
> > @@ -6576,17 +6576,17 @@ EXPORT_SYMBOL_GPL(lockdep_unregister_key);
> >   void __init lockdep_init(void)
> >   {
> > -	printk("Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar\n");
> > +	pr_info("Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar\n");
> > -	printk("... MAX_LOCKDEP_SUBCLASSES:  %lu\n", MAX_LOCKDEP_SUBCLASSES);
> > -	printk("... MAX_LOCK_DEPTH:          %lu\n", MAX_LOCK_DEPTH);
> > -	printk("... MAX_LOCKDEP_KEYS:        %lu\n", MAX_LOCKDEP_KEYS);
> > -	printk("... CLASSHASH_SIZE:          %lu\n", CLASSHASH_SIZE);
> > -	printk("... MAX_LOCKDEP_ENTRIES:     %lu\n", MAX_LOCKDEP_ENTRIES);
> > -	printk("... MAX_LOCKDEP_CHAINS:      %lu\n", MAX_LOCKDEP_CHAINS);
> > -	printk("... CHAINHASH_SIZE:          %lu\n", CHAINHASH_SIZE);
> > +	pr_info("... MAX_LOCKDEP_SUBCLASSES:  %lu\n", MAX_LOCKDEP_SUBCLASSES);
> > +	pr_info("... MAX_LOCK_DEPTH:          %lu\n", MAX_LOCK_DEPTH);
> > +	pr_info("... MAX_LOCKDEP_KEYS:        %lu\n", MAX_LOCKDEP_KEYS);
> > +	pr_info("... CLASSHASH_SIZE:          %lu\n", CLASSHASH_SIZE);
> > +	pr_info("... MAX_LOCKDEP_ENTRIES:     %lu\n", MAX_LOCKDEP_ENTRIES);
> > +	pr_info("... MAX_LOCKDEP_CHAINS:      %lu\n", MAX_LOCKDEP_CHAINS);
> > +	pr_info("... CHAINHASH_SIZE:          %lu\n", CHAINHASH_SIZE);
> > -	printk(" memory used by lock dependency info: %zu kB\n",
> > +	pr_info(" memory used by lock dependency info: %zu kB\n",
> >   	       (sizeof(lock_classes) +
> >   		sizeof(lock_classes_in_use) +
> >   		sizeof(classhash_table) +
> > @@ -6604,12 +6604,12 @@ void __init lockdep_init(void)
> >   		);
> >   #if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_PROVE_LOCKING)
> > -	printk(" memory used for stack traces: %zu kB\n",
> > +	pr_info(" memory used for stack traces: %zu kB\n",
> >   	       (sizeof(stack_trace) + sizeof(stack_trace_hash)) / 1024
> >   	       );
> >   #endif
> > -	printk(" per task-struct memory footprint: %zu bytes\n",
> > +	pr_info(" per task-struct memory footprint: %zu bytes\n",
> >   	       sizeof(((struct task_struct *)NULL)->held_locks));
> >   }
> 
> Make sense!
> 
> Reviewed-by: Waiman Long <longman@...hat.com>
> 

Thanks!

Queued in lockdep tree:

	https://git.kernel.org/pub/scm/linux/kernel/git/boqun/linux.git/log/?h=lockdep-for-tip

will send a PR to tip between -rc3 and -rc4.

Regards,
Boqun