[PATCH 2/9] ARM: pxa: enable sparsemem in saarb

[Russell King - ARM Linux]

On Fri, Apr 01, 2011 at 01:10:52PM +0800, Eric Miao wrote:
> On Fri, Apr 1, 2011 at 12:35 PM, Haojian Zhuang <hzhuang1 at marvell.com> wrote:
> > If I use HIGHMEM now, our some drivers and apps should be changed also. We don't want to change them.
> 
> I don't understand this will cause side effects to other drivers and apps?

If they're not using kmap_atomic() but are dealing directly with
page addresses, they'll fail if the pages are coming from highmem.

Given Linus' complaints in the OMAP pull request thread, I think we
should refuse, and have the drivers fixed to work with highmem.