backports: add proc_set_size() and proc_set_user()

backports: add proc_set_size() and proc_set_user()

mcgrof@frijol ~/linux-stable (git::master)$ git describe --contains 271a15ea
v3.10-rc1~129^2~24

commit 271a15eabe094538d958dc68ccfc9c36b699247a
Author: David Howells <dhowells@redhat.com>
Date:   Fri Apr 12 00:38:51 2013 +0100

    proc: Supply PDE attribute setting accessor functions

    Supply accessor functions to set attributes in proc_dir_entry structs.

    The following are supplied: proc_set_size() and proc_set_user().

    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
    cc: linuxppc-dev@lists.ozlabs.org
    cc: linux-media@vger.kernel.org
    cc: netdev@vger.kernel.org
    cc: linux-wireless@vger.kernel.org
    cc: linux-pci@vger.kernel.org
    cc: netfilter-devel@vger.kernel.org
    cc: alsa-devel@alsa-project.org
    Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>