On Tue, Apr 24, 2012 at 03:03:19PM +0200, Hiroshi Doyu wrote:
> > > Only Tegra3 has SMMU.
> > 
> > but all of them ? In that case, you could call this from probe itself,
> > right ? But an ifdef won't work in all cases, so you need to do runtime
> > detection based on some revision register or cpu detection...
> 
> So far we don't have so many variants, and presently TEGRA_3x_SOC
> always has a SMMU. If there were some variants of TEGRA_3x_SOC, where
> some might not have SMMU, then runtime detection would make sense
> there. Now it's something like TEGRA_3x_SOC == SMMU.

the problem is when you have single kernel for TEGRA 2 and TEGRA 3. If
you rely on ifdef, one of them won't work properly, right ? ;-)

-- 
balbi