mmap for /proc/vmcore broken since 3.12-rc1

[Michael Holzheu]

Hello Alexey,

Looks like the following commit broke mmap for /proc/vmcore:

commit c4fe24485729fc2cbff324c111e67a1cc2f9adea
Author: Alexey Dobriyan <adobriyan at gmail.com>
Date:   Tue Aug 20 22:17:24 2013 +0300

    sparc: fix PCI device proc file mmap(2)

Because /proc/vmcore (fs/proc/vmcore.c) does not implement the
get_unmapped_area() fops function mmap now always returns EIO.

Michael