linux-kernel - Re: [PATCH v2 1/2] fs: warn about impending deprecation of mandatory locks

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Date:   Fri, 20 Aug 2021 12:08:48 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     Jeff Layton <jlayton@...nel.org>, torvalds@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        ebiederm@...ssion.com, willy@...radead.org,
        linux-nfs@...r.kernel.org, viro@...iv.linux.org.uk,
        linux-doc@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
        linux-afs@...ts.infradead.org, cluster-devel@...hat.com,
        ocfs2-devel@....oracle.com, linux-mm@...ck.org,
        akpm@...ux-foundation.org, luto@...nel.org, bfields@...ldses.org,
        w@....eu, stable@...r.kernel.org
Subject: Re: [PATCH v2 1/2] fs: warn about impending deprecation of
 mandatory locks

On Fri, 20 Aug 2021 17:52:19 +0200
David Hildenbrand <david@...hat.com> wrote:

> > +static bool warned_mand;
> >   static inline bool may_mandlock(void)
> >   {
> > +	if (!warned_mand) {
> > +		warned_mand = true;
> > +		pr_warn("======================================================\n");
> > +		pr_warn("WARNING: the mand mount option is being deprecated and\n");
> > +		pr_warn("         will be removed in v5.15!\n");
> > +		pr_warn("======================================================\n");
> > +	}  
> 
> Is there a reason not to use pr_warn_once() ?

You would need a single call though, otherwise each pr_warn_once()
would have its own state that it warned once.

	const char warning[] =
		"======================================================\n"
		"WARNING: the mand mount option is being deprecated and\n"
		"         will be removed in v5.15!\n"
		"======================================================\n";

	pr_warn_once(warning);

-- Steve