We converted some of the usages of ACCESS_ONCE to READ_ONCE in the mm/
tree since it doesn't work reliably on non-scalar types.

This patch removes the rest of the usages of ACCESS_ONCE, and use the new
READ_ONCE API for the read accesses.  This makes things cleaner, instead
of using separate/multiple sets of APIs.
Signed-off-by: NJason Low <jason.low2@hp.com>
Acked-by: NMichal Hocko <mhocko@suse.cz>
Acked-by: NDavidlohr Bueso <dave@stgolabs.net>
Acked-by: NRik van Riel <riel@redhat.com>
Reviewed-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>