linux-kernel - Re: [PATCH v3 0/3] kernel/notifier.c: avoid duplicate registration

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Date:   Wed, 10 Jul 2019 07:56:28 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Xiaoming Ni <nixiaoming@...wei.com>
Cc:     adobriyan@...il.com, akpm@...ux-foundation.org,
        anna.schumaker@...app.com, arjan@...ux.intel.com,
        bfields@...ldses.org, chuck.lever@...cle.com, davem@...emloft.net,
        jlayton@...nel.org, luto@...nel.org, mingo@...nel.org,
        Nadia.Derbey@...l.net, paulmck@...ux.vnet.ibm.com,
        semen.protsenko@...aro.org, stable@...nel.org,
        stern@...land.harvard.edu, tglx@...utronix.de,
        torvalds@...ux-foundation.org, trond.myklebust@...merspace.com,
        viresh.kumar@...aro.org, vvs@...tuozzo.com,
        alex.huangjianhui@...wei.com, dylix.dailei@...wei.com,
        linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v3 0/3] kernel/notifier.c: avoid duplicate registration

On Wed, Jul 10, 2019 at 11:09:07AM +0800, Xiaoming Ni wrote:
> Registering the same notifier to a hook repeatedly can cause the hook
> list to form a ring or lose other members of the list.

Then don't do that :)

Is there any in-kernel users that do do this?  If so, please just fix
them.

thanks,

greg k-h