netdev - Re: [PATCH] net: change netdev_unregister_timeout

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Message-ID: <CACT4Y+ad6bwMbQ6OwrdypCsNRvYTMtMf0KR2EpVOhPOZvnxeNA@mail.gmail.com>
Date:   Thu, 25 Mar 2021 15:38:31 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>,
        Leon Romanovsky <leon@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: change netdev_unregister_timeout_secs min value to 1

On Thu, Mar 25, 2021 at 3:34 PM Eric Dumazet <eric.dumazet@...il.com> wrote:
> On 3/25/21 11:31 AM, Dmitry Vyukov wrote:
> > netdev_unregister_timeout_secs=0 can lead to printing the
> > "waiting for dev to become free" message every jiffy.
> > This is too frequent and unnecessary.
> > Set the min value to 1 second.
> >
> > Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
> > Suggested-by: Eric Dumazet <edumazet@...gle.com>
> > Fixes: 5aa3afe107d9 ("net: make unregister netdev warning timeout configurable")
> > Cc: netdev@...r.kernel.org
> > Cc: linux-kernel@...r.kernel.org
> > ---
>
> Please respin your patch, and fix the merge issue [1]

Is net-next rebuilt and rebased? Do I send v4 of the whole change?
I cannot base it on net-next now, because net-next already includes
most of it... so what should I use as base then?

> For networking patches it is customary to tell if its for net or net-next tree.
>
> [1]
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 4bb6dcdbed8b856c03dc4af8b7fafe08984e803f..7bb00b8b86c6494c033cf57460f96ff3adebe081 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -10431,7 +10431,7 @@ static void netdev_wait_allrefs(struct net_device *dev)
>
>                 refcnt = netdev_refcnt_read(dev);
>
> -               if (refcnt &&
> +               if (refcnt != 1 &&
>                     time_after(jiffies, warning_time +
>                                netdev_unregister_timeout_secs * HZ)) {
>                         pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",