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

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Date:	Sat, 2 Dec 2006 14:05:21 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	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

On Sat, Dec 02, 2006 at 01:59:30PM +0100, Thomas Gleixner wrote:
> On Fri, 2006-12-01 at 17:21 +0000, Al Viro wrote:
> > Now, there's another question: how do we get there?  Or, at least, from
> > current void (*)(unsigned long) to void (*)(void *)...
> 
> I think the real solution should be 
> 
> 	void (*function)(struct timer_list *timer);
> 
> and hand the timer itself to the callback. Most of the timers are
> embedded into data structures anyway and for the rest we can easily
> build one.

Ewwwwwww....

Let's not.  It means more cruft in callbacks for no good reason.
And more cruft in code setting it up, while we are at it.

> > "A fscking huge patch flipping everything at once" is obviously not an
> > answer; too much PITA merging and impossible to review.
> 
> There are ~ 500 files affected and this is in the range of cleanups we
> did recently at the end of the merge window already. I'd volunteer to
> hack this up and keep the patch up to date until the final merge. I have
> done that before and I'm not scared about it. The patches are a couple
> of lines per file and I do not agree that this is impossible to review. 

I'd rather see that as patch series, TYVM.  And no, it won't be a couple
of lines per file with your variant.

Anyway, I'm doing that series in my tree, will post when it's over...
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