linux-kernel - Re: [PATCH 1/2] PM / Freezer: Remove the "userspace only" constraint from freezer[_do_not]

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Message-ID: <20111206172020.GA709@redhat.com>
Date:	Tue, 6 Dec 2011 18:20:20 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	rjw@...k.pl, pavel@....cz, len.brown@...el.com, tj@...nel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 1/2] PM / Freezer: Remove the "userspace only"
	constraint from freezer[_do_not]_count()

On 12/06, Srivatsa S. Bhat wrote:
>
> And moreover, even the vfork issue does not need
> the above restriction in these functions, since they are anyway called by
> userspace processes.

This looks a bit confusing, as if CLONE_VFORK is not used by kthreads.
It is actually used, but only by the non-freezeable workqueue threads,
so the patch is fine.

Reviewed-by: Oleg Nesterov <oleg@...hat.com>

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