On Thu, 28 Mar 2013 05:04:26 -0700
"Luis R. Rodriguez" [off-list ref] 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...

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