gpu: nvgpu: mark vidmem.cleared volatile

The boolean flag mm_gk20a.vidmem.cleared is shared across threads, so
mark it volatile to prevent compiler from wrongly optimizing accesses to
it.

Jira DNVGPU-84

Change-Id: I1fe66b26966685d3f74ed95ba53b198f810231b9
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/1233016
(cherry picked from commit dc6c9db56ea8a5f55f28f97fdfc3c1ac60d8b195)
Reviewed-on: http://git-master/r/1235317
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
index fe10b046..75209063 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
@@ -417,7 +417,7 @@ struct mm_gk20a {
                 struct gk20a_allocator bootstrap_allocator;
 
                 u32 ce_ctx_id;
-                bool cleared;
+                volatile bool cleared;
                 struct mutex first_clear_mutex;
 
                 struct list_head clear_list_head;