Re: cramfs b0rken on HIGHMEM machines

[Alan Cox]

> just look at fs/cramfs/inode.c:cramfs_read_page()
> It uses page_address instead of kmap().
> 
> I would have fixed it myself, but I don't know, how I should
> kunmap() it, once we have memory pressure.

Take a look at ramfs. kmap isnt really a 'pressure' thing. You want to kunmap
the page as soon as you can. The kmap/unmap operations are fairly fast but
there is a limited pool of maps.

Alan