linux-kernel - Re: [PATCH] vt: add an event interface

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Message-ID: <20090703100834.6cb241b6@lxorguk.ukuu.org.uk>
Date:	Fri, 3 Jul 2009 10:08:34 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	lennart@...ttering.net, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] vt: add an event interface

> Just a side-note, please run new patches through 
> scripts/checkpatch.pl:
> 
>     total: 4 errors, 2 warnings, 0 checks, 294 lines checked

Given the code doesn't currently *work* yet but is a first draft its
hardly important and there are better uses of time than playing
checkpatch policeman.

>  - the copy_from_user() in vt_event_wait_ioctl() could be shortened 
>    if we didnt pass in an unsigned long (which is pointless anyway).
>    The cast to void __user * should be done in the ioctl 
>    demultiplexer vt_ioctl(), and the ioctl ugliness should not 
>    invade cleaner child functions such as vt_event_wait_ioctl().
> 
>  - same for vt_event_wait_ioctl() - it passes in a type damaged by 
>    ioctl's limitations. Such type limitations and ioctl demuxing 
>    artifacts should be kept local to vt_ioctl().

That had already occurred to me. The events should also become a mask so
you can wait for several at once. What I wanted to know was whether such
an interface actually meets Lennart's requirements.

Alan
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