author Al Viro <viro@zeniv.linux.org.uk> 1298342087 -0500
committer Al Viro <viro@zeniv.linux.org.uk> 1300108523 -0400

take RCU-dependent stuff around exec_permission() into a new helper

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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