[RFC] Prohibit ioremap() on kernel managed RAM

[Russell King - ARM Linux]

On Wed, May 05, 2010 at 12:23:45PM -0400, George G. Davis wrote:
> So could we similarly we relax this "Prohibit ioremap() on kernel managed
> RAM" change for reserved pages?  Like so:
> 
> 	/*
> 	 * Don't allow RAM to be mapped - this causes problems with ARMv6+
> 	 */
> 	if (WARN_ON(pfn_valid(pfn) && !PageReserved(pfn_to_page(pfn)))
> 		return NULL;
> 

Only once the rest of the solution gets implemented; making this change
on its own doesn't mean very much or have very much effect.