Subject: RE: Do LKMs work *at*all* on powerpc platforms?
To: None <email@example.com>
From: Todd Vierling <firstname.lastname@example.org>
Date: 08/07/2000 21:15:13
On Mon, 7 Aug 2000, Bill Studenmund wrote:
: > > I think adding something like -mlong-call and __attribute__ ((short-call))
: > > would be the most efficient thing. :-)
(Note that I do have the ppc ref manuals, but I stepped into the thread
late; I subscribed to port-macppc a week ago.)
Exactly how much overhead are we looking at between longcall and shortcall
here? I just want to know how many CPU cycles we're anticipating for the
difference in calling convention, and whether it could be worth doing
-mlong-call universally, or just as a documented prerequisite for
LKM-capable kernels. You could have something like:
#options LKM # loadable kernel modules
#makeoptions COPTS="-mlong-call" # required for LKMs to work
in the GENERIC config file, documenting the specific need. Note that COPTS
here is only an example; you'd probably want to invent a new make variable
name (CALLTYPE?) specifically for this purpose.
-- Todd Vierling <email@example.com> * http://www.wasabisystems.com/
-- Speed, stability, security, and support. Wasabi NetBSD: Run with it.