linux-kernel - Re: [PATCH 1/1] u64_stats: fix u64_stats_init() for lockdep when used repeatedly in one file

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Message-ID: <CANn89iKQpSaF5KG5=dT_o=WBeZtCiLcN768eUdYvUew-dLbKaA@mail.gmail.com>
Date: Mon, 11 Mar 2024 18:43:59 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Petr Tesařík <petr@...arici.cz>
Cc: "David S. Miller" <davem@...emloft.net>, 
	Linux regressions mailing list <regressions@...ts.linux.dev>, open list <linux-kernel@...r.kernel.org>, 
	"Linux regression tracking (Thorsten Leemhuis)" <regressions@...mhuis.info>, stable@...nel.org
Subject: Re: [PATCH 1/1] u64_stats: fix u64_stats_init() for lockdep when used
 repeatedly in one file

On Mon, Mar 11, 2024 at 6:25 PM Petr Tesařík <petr@...arici.cz> wrote:
>
> On Wed,  6 Mar 2024 12:11:57 +0100
> 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.
>
> What happens with this fix now?
>
> IIUC it should be reviewed by Eric, but I don't know through which tree
> it should be merged. Any plans yet?

I thought I gave a reply, but apparently not .

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

Thanks.