linux-kernel - Re: [PATCH net] u64_stats: fix u64_stats_init() for lockdep when used repeatedly in one file

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Message-ID: <20240406094449.1ac182d0@meshulam.tesarici.cz>
Date: Sat, 6 Apr 2024 09:44:49 +0200
From: Petr Tesařík <petr@...arici.cz>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>, open list
 <netdev@...r.kernel.org>, Linux regressions mailing list
 <regressions@...ts.linux.dev>, open list <linux-kernel@...r.kernel.org>,
 "Linux regression tracking (Thorsten Leemhuis)" <regressions@...mhuis.info>
Subject: Re: [PATCH net] u64_stats: fix u64_stats_init() for lockdep when
 used repeatedly in one file

On Fri, 5 Apr 2024 23:08:58 +0200
Eric Dumazet <edumazet@...gle.com> wrote:

> On Thu, Apr 4, 2024 at 9:58 AM Petr Tesarik <petr@...arici.cz> wrote:
> >
> > Fix bogus lockdep warnings if multiple u64_stats_sync variables are
> > initialized in the same file.
> >
> > With CONFIG_LOCKDEP, seqcount_init() is a macro which declares:
> >
> >         static struct lock_class_key __key;
> >
> > Since u64_stats_init() is a function (albeit an inline one), all calls
> > within the same file end up using the same instance, effectively treating
> > them all as a single lock-class.
> >
> > Fixes: 9464ca650008 ("net: make u64_stats_init() a function")
> > Closes: https://lore.kernel.org/netdev/ea1567d9-ce66-45e6-8168-ac40a47d1821@roeck-us.net/
> > Signed-off-by: Petr Tesarik <petr@...arici.cz>  
> 
> I thought I gave a Reviewed-by: tag already...

You did, but at that time I didn't know which tree should be used to
merge the patch, so it appeared as a stranded patch on LKML. Once we
agreed it should go through net, I sent it again, but the resend didn't
have it.

Thanks for your assistance!

Petr T

> Reviewed-by: Eric Dumazet <edumazet@...gle.com>