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(parent: 14ee0a1) | patch
get_user_pages: don't try to follow PFNMAP pages
authorLinus Torvalds <torvalds@g5.osdl.org>
Tue, 13 Dec 2005 00:24:33 +0000 (16:24 -0800)
committerLinus Torvalds <torvalds@g5.osdl.org>
Tue, 13 Dec 2005 00:24:33 +0000 (16:24 -0800)
commit1ff8038988adecfde71d82c0597727fc239d4e8c
treea592cbfad237a5e373724918a0cc17ee9c421237tree | snapshot (tar.gz zip)
parent14ee0a1414536d27bc29373bf23c106b8ef8ce0bcommit | diff
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>
mm/memory.c diff | blob | blame | history