Re: Bug: Discontigmem virt_to_page() [Alpha,ARM,Mips64?]

[Martin J. Bligh]

> Putting the mem_map in highmem would be the first step, after that you
> should be just at at the 90% of work done to make it general purpose,
> you should wrap most actions on the page struct with wrappers and it
> will be quite an invasive change (much more invasive than pte-highmem),
> but it could be done. For this one (unlike pte-highmem) you definitely
> need a config option to select it, most people doesn't need this feature
> enabled because they've less than 8G of ram and also considering it will
> have a significant runtime cost.

Absolutely agree making it an option - other people with smaller memory
configs may also find this useful for enlarging the user address space 
to 3.5Gb for databases et al. with a 8Gb or 16Gb machine.
 
M.