linux-kernel - Re: [RFC] Virtual methods for devices and generalized GPIO support using it

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Date:	Wed, 28 Mar 2007 09:32:57 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Paul Sokolovsky <pmiscml@...il.com>
CC:	linux-kernel@...r.kernel.org, kernel-discuss@...dhelds.org,
	Anton Vorontsov <cbou@...l.ru>
Subject: Re: [RFC] Virtual methods for devices and generalized GPIO support
 using it

Paul Sokolovsky wrote:
> 
> In this respect, VTABLE(), METHOD() macros serve the same purpose as 
> container_of() and list_for_each() - they are besides offering (more) 
> convenient syntax, also carry important annotattion and educational
> messages, like "it's ok, and encouraged to embed one structure into 
> another - use it!" or "list manipulation is a trivial operation for kernel,
> and we want you to treat it as such and use in standard, easily 
> distinguishable way".
> 

You realize, right, that the Linux kernel already have a much cleaner 
way to do vtables in the kernel, without this kind of macro crappage? 
It's called an _ops table, and is used in a patternized way:

foo->x_ops->func(foo, ...);

... all over the kernel.  We like it that way.

	-hpa
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