linux-kernel - Re: [JANITOR PROPOSAL] Switch ioctl functions to ->unlocked

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Date:	Thu, 10 Jan 2008 11:02:11 +0100
From:	Rolf Eike Beer <eike-kernel@...tec.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	paolo.ciarrocchi@...il.com, gorcunov@...il.com
Subject: Re: [JANITOR PROPOSAL] Switch ioctl functions to ->unlocked_ioctl

Andi Kleen wrote:
> > Can you explain the rationale behind that running on the BKL? What type
> > of
>
> It used to always run with the BKL because everything used to
> and originally nobody wanted to review all ioctl handlers in tree to see if
> they can run with more fine grained locking. A lot probably can though.
>
> > things needs to be protected so that this huge hammer is needed? What
> > would be an earlier point to release the BKL?
>
> That depends on the driver. A lot don't need BKL at all and
> in others it can be easily eliminated. But it needs case-by-case
> review of the locking situation.
>
> The goal of the proposal here is just to make it more visible.

So if I write my own driver and have never heard of ioctls running on BKL 
before I can rather be sure that I just can change the interface of the ioctl 
function, put it in unlocked_ioctl and are fine? Cool.

Eike

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