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

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Message-Id: <1165082803.24604.54.camel@localhost.localdomain>
Date:	Sat, 02 Dec 2006 19:06:43 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Al Viro <viro@....linux.org.uk>,
	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, 2006-12-02 at 09:02 -0700, Matthew Wilcox wrote:
> On Sat, Dec 02, 2006 at 03:45:12PM +0100, Thomas Gleixner wrote:
> > What's the cruft ? 
> > 
> > struct bla = container_of(timer, struct bla, timer); ???
> 
> That's it, right there.  Any idea how much we've bloated the kernel with
> sysfs, just by insisting that the struct device not be the first item in
> the struct?  There's any number of 2- and 3- line functions calling each
> other, each adding and subtracting constants from the pointers passed to
> them.  This was a huge mistake, IMO.

What a nonsense.

	foo->timer.data = foo;

is complete redundant information.

This is going to make a lot of data structures smaller, when the
timer_list is embedded in the structure itself and for the lot, which
ignores the timer callback argument anyway.

	tglx



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