linux-kernel - Re: [PATCH] compat/compat-drivers/linux-next: fb skip_vt

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Date:	Thu, 28 Mar 2013 17:19:59 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	FlorianSchandinat@....de, linux-fbdev@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, backports@...r.kernel.org,
	cocci@...teme.lip6.fr, linux-kernel@...r.kernel.org,
	julia.lawall@...6.fr, rodrigo.vivi@...il.com,
	daniel.vetter@...ll.ch, rafael.j.wysocki@...el.com
Subject: Re: [PATCH] compat/compat-drivers/linux-next: fb skip_vt_switch

On Thu, 28 Mar 2013, Jesse Barnes wrote:

> On Thu, 28 Mar 2013 05:04:26 -0700
> "Luis R. Rodriguez" <mcgrof@...not-panic.com> wrote:
>
> > The new commit by Jesse that extended the fb_info with a skip_vt_switch
> > element is the simplest example of a data structure expansion. We'd backport
> > this by adding a static inline to compat so that new kernels muck with the
> > new element and for older kernels this would be a no-op. This reduces the
> > size of the backport and unclutters the required patch with #idefs, and
> > insteads leaves only a replacement of the usage of the new elements with
> > a static inline, this however would still be required on our end:
> >
> > 	-      info->skip_vt_switch = true;
> > 	+      fb_enable_skip_vt_switch(info);
> >
> > So we'd then have to just add this static inline change for each new driver...
> > There may be a way to get SmPL to do this for us...

@@
type of info  *info;
@@

-      info->skip_vt_switch = true;
+      fb_enable_skip_vt_switch(info);

for whatever the type of info is.

Then I guess there would be a similar rule for the false case?

julia


>
> Yeah I'm not attached to the direct structure reference; a couple of
> inlines are just as easy to read.  So no argument from me.
>
> Thanks,
> --
> Jesse Barnes, Intel Open Source Technology Center
>
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