diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2014-11-20 05:12:09 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-21 13:10:02 -0400 |
| commit | eb1eecd100ce48d4f8368a0c475ecb937abd40ec (patch) | |
| tree | 439f91910db9156bf3ffed7015231f608fab11c7 /Documentation/cputopology.txt | |
| parent | f3ff4345ef597115869a227dbf738dde157f8521 (diff) | |
ARC: add smp barriers around atomics per Documentation/atomic_ops.txt
commit 2576c28e3f623ed401db7e6197241865328620ef upstream.
- arch_spin_lock/unlock were lacking the ACQUIRE/RELEASE barriers
Since ARCv2 only provides load/load, store/store and all/all, we need
the full barrier
- LLOCK/SCOND based atomics, bitops, cmpxchg, which return modified
values were lacking the explicit smp barriers.
- Non LLOCK/SCOND varaints don't need the explicit barriers since that
is implicity provided by the spin locks used to implement the
critical section (the spin lock barriers in turn are also fixed in
this commit as explained above
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/cputopology.txt')
0 files changed, 0 insertions, 0 deletions