tree a592cbfad237a5e373724918a0cc17ee9c421237
parent 14ee0a1414536d27bc29373bf23c106b8ef8ce0b
author Linus Torvalds <torvalds@g5.osdl.org> 1134433473 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1134433473 -0800

get_user_pages: don't try to follow PFNMAP pages

Nick Piggin points out that a few drivers play games with VM_IO (why?
who knows..) and thus a pfn-remapped area may not have that bit set even
if remap_pfn_range() set it originally.

So make it explicit in get_user_pages() that we don't follow VM_PFNMAP
pages, since pretty much by definition they do not have a "struct page"
associated with them.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>