On Tue, Oct 30, 2007 at 05:50:56PM +0900, Simon Horman wrote:
> On Tue, Oct 30, 2007 at 12:36:22AM -0700, David Miller wrote:
> > From: Simon Horman <[email protected]>
> > Date: Tue, 30 Oct 2007 16:15:13 +0900
> >
> > > Though curiuously with my config nothing uses per_cpu_offset()
> > > (I added a bogus call to produce an error.) Is it actually
> > > used on ia64?
> >
> > It is unused, and in that regard should probably be deleted.
> >
> > include/asm-generic/percpu.h defines a seemingly similarly
> > unused per_cpu_offset() macro define as well
>
> It looks like they were both added by "[PATCH] lockdep: add per_cpu_offset()"
> (a875a69f8b00a38b4f40d9632a4fc71a159f0e0d)
>
> Perhaps they were used at that time?
I looked into this a little further:
I'm pretty much convinced that the asm-ia64 version of per_cpu_offset()
is unused as ia64 doesn't have lockdep. I will send a patch to get rid
of it. The generic version might be used on mips, sh or arm with
CONFIG_SMP, as these architectures have lockdep. I did managed to
produce a compiler error on mips by removing the asm-generic version of
per_cpu_offset().
--
Horms
H: http://www.vergenet.net/~horms/
W: http://www.valinux.co.jp/en/
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