linux-kernel - Re: [PATCH] cgroup: make cgrp->event_list

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Message-ID: <CAOS58YOvVoe5KZXMB+mSF2OhXF9_eR+yipk96JW9Fenn2EJ1XA@mail.gmail.com>
Date:	Tue, 5 Mar 2013 23:23:24 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH] cgroup: make cgrp->event_list_lock irqsafe

On Tue, Mar 5, 2013 at 11:21 PM, Tejun Heo <tj@...nel.org> wrote:
>> wake_up() is also allowed to be called from irq handler?
>
> Yeah, well, we don't consider everything which uses wake_up() to be
> irq-safe. I'm not necessarily against making the lock irq-safe but at

More precise way to think about it wiatqueue lock would be that it's
built in a way that also allows it to be used from irq context. It
doesn't *force* irq context on all its users.

-- 
tejun
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