linux-kernel - Re: [RFC] timers, pointers to functions and type safety

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Message-ID: <Pine.LNX.4.64.0612022306360.1867@scrub.home>
Date:	Sat, 2 Dec 2006 23:13:21 +0100 (CET)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Al Viro <viro@....linux.org.uk>
cc:	Thomas Gleixner <tglx@...utronix.de>,
	Matthew Wilcox <matthew@....cx>,
	Linus Torvalds <torvalds@...l.org>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] timers, pointers to functions and type safety

Hi,

On Sat, 2 Dec 2006, Al Viro wrote:

> > You need some more magic macros to access/modify the data field.
> 
> Which is done bloody rarely.  grep and you'll see...  BTW, there are
> other reasons why passing struct timer_list * is wrong:
> 	* direct calls of the timer callback

Why should that be wrong?

> 	* callback being the same for two timers embedded into
> different structs

That's done bloody rarely as well.

> 	* see a timer callback, decide it looks better as a tasklet.
> What, need a different glue now?

What's wrong with changing the prototype? If you don't do it, the compiler 
will complain about it anyway.

> Look, it's a delayed call.  The less glue we need, the better - the
> rules are much simpler that way, so that alone means that we'll get
> fewer fsckups.

You have the glue in a different place, so what?
The other alternative has real _practical_ value in almost every case, 
which I very much prefer. What's wrong with that?

bye, Roman
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