netdev - Re: [PATCH net v3 09/11] net: core: add ignore flag to netdev

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Message-ID: <20190920162445.5eebca98@cakuba.netronome.com>
Date:   Fri, 20 Sep 2019 16:24:45 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Taehee Yoo <ap420073@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, j.vosburgh@...il.com,
        vfalico@...il.com, andy@...yhouse.net, jiri@...nulli.us,
        sd@...asysnail.net, roopa@...ulusnetworks.com, saeedm@...lanox.com,
        manishc@...vell.com, rahulv@...vell.com, kys@...rosoft.com,
        haiyangz@...rosoft.com, stephen@...workplumber.org,
        sashal@...nel.org, hare@...e.de, varun@...lsio.com,
        ubraun@...ux.ibm.com, kgraul@...ux.ibm.com,
        jay.vosburgh@...onical.com
Subject: Re: [PATCH net v3 09/11] net: core: add ignore flag to
 netdev_adjacent structure

On Mon, 16 Sep 2019 22:48:00 +0900, Taehee Yoo wrote:
> In order to link an adjacent node, netdev_upper_dev_link() is used
> and in order to unlink an adjacent node, netdev_upper_dev_unlink() is used.
> unlink operation does not fail, but link operation can fail.
> 
> In order to exchange adjacent nodes, we should unlink an old adjacent
> node first. then, link a new adjacent node.
> If link operation is failed, we should link an old adjacent node again.
> But this link operation can fail too.
> It eventually breaks the adjacent link relationship.
> 
> This patch adds an ignore flag into the netdev_adjacent structure.
> If this flag is set, netdev_upper_dev_link() ignores an old adjacent
> node for a moment.
> So we can skip unlink operation before link operation.
> 
> Signed-off-by: Taehee Yoo <ap420073@...il.com>

I think there's a number of local functions here which are missing the
static keyword, we'll get a flurry of fixes as soon as we apply this.

Could you please take a look at fixing that, I think W=1 should help,
-Wmissing-prototypes in particular, if I'm remembering right.