[PATCH 15/19] qht: Fix tsan warnings.

[Robert Foley <robert.foley@linaro.org>]

For example:
WARNING: ThreadSanitizer: data race (pid=23406)
  Atomic read of size 4 at 0x7b100003e3c8 by thread T7:
    #0 __tsan_atomic32_load <null> (qemu-system-aarch64+0x39a36c)
    #1 qht_do_lookup util/qht.c:495:17 (qemu-system-aarch64+0xd82f7a)
    #2 qht_lookup_custom util/qht.c:539:11 (qemu-system-aarch64+0xd82f7a)
  Previous write of size 8 at 0x7b100003e3c8 by thread T6 (mutexes: write M166769147697783108, write M995435858420506688):
    #0 posix_memalign <null> (qemu-system-aarch64+0x350dd1)
    #1 qemu_try_memalign util/oslib-posix.c:189:11 (qemu-system-aarch64+0xd59317)
    #2 qemu_memalign util/oslib-posix.c:205:27 (qemu-system-aarch64+0xd5943e)
    #3 qht_insert__locked util/qht.c:583:9 (qemu-system-aarch64+0xd837c5)

Signed-off-by: Robert Foley <robert.foley@linaro.org>
---
 util/qht.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/util/qht.c b/util/qht.c
index 67e5d5b916..739a53ced0 100644
--- a/util/qht.c
+++ b/util/qht.c
@@ -69,6 +69,7 @@
 #include "qemu/qht.h"
 #include "qemu/atomic.h"
 #include "qemu/rcu.h"
+#include "qemu/tsan.h"
 
 //#define QHT_DEBUG
 
@@ -580,10 +581,12 @@ static void *qht_insert__locked(const struct qht *ht, struct qht_map *map,
         b = b->next;
     } while (b);
 
+    TSAN_ANNOTATE_IGNORE_WRITES_BEGIN();
     b = qemu_memalign(QHT_BUCKET_ALIGN, sizeof(*b));
     memset(b, 0, sizeof(*b));
     new = b;
     i = 0;
+    TSAN_ANNOTATE_IGNORE_WRITES_END();
     atomic_inc(&map->n_added_buckets);
     if (unlikely(qht_map_needs_resize(map)) && needs_resize) {
         *needs_resize = true;
-- 
2.17.1