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vm: convert mtdchar mmap to vm_iomap_memory() helper
BugLink: http://bugs.launchpad.net/bugs/1173170 commit 8558e4a upstream. This is my example conversion of a few existing mmap users. The mtdchar case is actually disabled right now (and stays disabled), but I did it because it showed up on my "git grep", and I was familiar with the code due to fixing an overflow problem in the code in commit 9c603e5 ("mtdchar: fix offset overflow detection"). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
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