[PATCH 13/15] ARM: make mach/io.h include optional

[Nicolas Pitre]

On Tue, 14 Feb 2012, Russell King - ARM Linux wrote:

> On Tue, Feb 14, 2012 at 05:09:01PM -0600, Rob Herring wrote:
> > BTW, I noticed some static mappings at 0xffxxxxxx. Are those even a
> > valid address?
> 
> Nothing invalid about them as such, but I have tried to discourage their
> use in case we decide that we want to go for a default 14MB DMA region.

They should be invalid, and would be flagged by this code in 
create_mapping():

        if ((md->type == MT_DEVICE || md->type == MT_ROM) &&
            md->virtual >= PAGE_OFFSET &&
            (md->virtual < VMALLOC_START || md->virtual >= VMALLOC_END)) 
        {
                printk(KERN_WARNING "BUG: mapping for 0x%08llx"
                       " at 0x%08lx out of vmalloc space\n",
                       (long long)__pfn_to_phys((u64)md->pfn), md->virtual);
        }

given that VMALLOC_END is now defined as 0xff000000.

What are those static mappings at 0xffxxxxxx?  I was looking for them 
while reworking this code but I might have missed some.


Nicolas