netdev - Re: What is the purpose of dev->gflags?

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Message-ID: <20220411154911.3mjcprftqt6dpqou@skbuf>
Date:   Mon, 11 Apr 2022 18:49:11 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:     Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: What is the purpose of dev->gflags?

On Mon, Apr 11, 2022 at 05:43:01PM +0200, Nicolas Dichtel wrote:
> 
> Le 11/04/2022 à 17:33, Vladimir Oltean a écrit :
> [snip]
> > Would you agree that the __dev_set_allmulti() -> __dev_notify_flags()
> > call path is dead code? If it is, is there any problem it should be
> > addressing which it isn't, or can we just delete it?
> I probably miss your point, why is it dead code?

Because __dev_set_allmulti() doesn't update dev->gflags, it means
dev->gflags == old_gflags. In turn, it means dev->gflags ^ old_gflags,
passed to "gchanges" of __dev_notify_flags(), is 0.