tree 36f63ef018f6842f91b2118240cc6a144ef52571
parent 14cf3d977b80f5e355f8ac7547cf1b9ff9fb3e09
author Christian Borntraeger <borntraeger@de.ibm.com> 1416583316 +0100
committer Christian Borntraeger <borntraeger@de.ibm.com> 1418892879 +0100

mips/gup: Replace ACCESS_ONCE with READ_ONCE

ACCESS_ONCE does not work reliably on non-scalar types. For
example gcc 4.6 and 4.7 might remove the volatile tag for such
accesses during the SRA (scalar replacement of aggregates) step
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145)

Change the gup code to replace ACCESS_ONCE with READ_ONCE.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>