netdev - Re: [PATCH net 1/2] net: bpfilter: restart bpfilter

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Message-Id: <20181218.145146.244782972476250812.davem@davemloft.net>
Date:   Tue, 18 Dec 2018 14:51:46 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     ap420073@...il.com
Cc:     netdev@...r.kernel.org, daniel@...earbox.net, ast@...nel.org
Subject: Re: [PATCH net 1/2] net: bpfilter: restart bpfilter_umh when error
 occurred

From: Taehee Yoo <ap420073@...il.com>
Date: Mon, 17 Dec 2018 16:31:04 +0900

> But I don't know how cleanup callback is invoked when
> bpfilter_umh process is killed.

I am suggesting that a new piece of generic infrastructure might
be needed, but it would need to be carefully designed.

The task_struct would get a piece of state, and at exit() time
the kernel would check that state and use it to invoke exit()
time cleanups for UMH type processes.

Is the idea clearer now?