tree b4f3f45190b814b5196235c21f983fbc7878a47b
parent c9cfcddfd65735437a4cb8563d6b66a6da8a5ed6
author Linus Torvalds <torvalds@g5.osdl.org> 1133302075 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1133302075 -0800

cow_user_page: fix page alignment

High Dickins points out that the user virtual address passed to the page
fault handler isn't necessarily page-aligned.

Also, add a comment on why the copy could fail for the user address case.

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