linux-kernel - Re: [PATCH 2/8] param: use ops in struct kernel_param, rather than get and set fns directly

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Message-ID: <s5hvdhxyyl7.wl%tiwai@suse.de>
Date:	Fri, 30 Oct 2009 11:18:12 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Ville Syrjala <syrjala@....fi>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Alessandro Rubini <rubini@...vis.unipv.it>,
	Michal Januszewski <spock@...too.org>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Neil Brown <neilb@...e.de>, linux-input@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net, linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 2/8] param: use ops in struct kernel_param, rather than get and set fns directly

At Fri, 23 Oct 2009 00:51:28 +1030,
Rusty Russell wrote:
> 
> This is more kernel-ish, saves some space, and also allows us to
> expand the ops without breaking all the callers who are happy for the
> new members to be NULL.
> 
> The few places which defined their own param types are changed to the
> new scheme.
> 
> Since we're touching them anyway, we change get and set to take a
> const struct kernel_param (which they were, and will be again).
> 
> To reduce churn, module_param_call creates the ops struct so the callers
> don't have to change (and casts the functions to reduce warnings).
> The modern version which takes an ops struct is called module_param_cb.

This is nice, as it also reduces the size of struct kernel_param, so
each parameter uses less footprint (who cares, though?) :)

But, just wondering whether we still need to export get/set
functions.  They can be called from ops now, so if any, it can be
defined even as an inlinefunction or a macro.


thanks,

Takashi
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