tree f1ef574626d0253813e9436fe7a114cf48af19a5
parent af2e7aaed1ccf30e61af3e096ac2c7df2f2d6c2a
author Christian Borntraeger <borntraeger@de.ibm.com> 1416912266 +0100
committer Christian Borntraeger <borntraeger@de.ibm.com> 1418892880 +0100

arm/spinlock: 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 spinlock 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>