The powerpc implementation of qspinlocks will both poll and spin on the
bitlock guarding a qnode. Mark these accesses with READ_ONCE to convey
to KCSAN that polling is intentional here.
Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230510033117.1395895-2-rmclure@linux.ibm.com
smp_rmb(); /* See __yield_to_locked_owner comment */
- if (!node->locked) {
+ if (!READ_ONCE(node->locked)) {
yield_to_preempted(prev_cpu, yield_count);
spin_begin();
return preempted;
/* Wait for mcs node lock to be released */
spin_begin();
- while (!node->locked) {
+ while (!READ_ONCE(node->locked)) {
spec_barrier();
if (yield_to_prev(lock, node, old, paravirt))