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

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Message-ID: <20090703064518.GA30674@elte.hu>
Date:	Fri, 3 Jul 2009 08:45:18 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	lennart@...ttering.net, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] vt: add an event interface


* Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> Lennart how does this fit your needs - this replaces the existing wait
> active hack with a race free one and adds other events with a proper
> infrastructure for them.
> 
> From: Alan Cox <alan@...ux.intel.com>
> 
> This is needed and requested in various forms for ConsoleKit, screenblank
> handling and the like so do the job with a single interface. Also build the
> interface so that unlike VT_WAITACTIVE and friends it won't miss events.
> 
> Signed-off-by: Alan Cox <alan@...ux.intel.com>
> ---
> 
>  drivers/char/vt.c       |    4 +
>  drivers/char/vt_ioctl.c |  181 ++++++++++++++++++++++++++++++++++-------------
>  include/linux/vt.h      |   14 ++++
>  include/linux/vt_kern.h |    3 +
>  kernel/power/console.c  |    4 +
>  5 files changed, 152 insertions(+), 54 deletions(-)

Just a side-note, please run new patches through 
scripts/checkpatch.pl:

    total: 4 errors, 2 warnings, 0 checks, 294 lines checked

all four errors it flagged should be fixed.

Even the two warnings about over-long lines show real problem areas 
that could be improved:

 - 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().

Thanks,

	Ingo
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