gpu: nvgpu: NVGPU abstraction for ACCESS_ONCE

Construct a wrapper macro NV_ACCESS_ONCE(x) which uses OS specific
versions of ACCESS_ONCE. e.g for linux, ACCESS_ONCE(x) is used.

Jira NVGPU-125

Change-Id: Ia5c67baae111c1a7978c530bf279715fc808287d
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1549928
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

2 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/barrier.h b/drivers/gpu/nvgpu/include/nvgpu/barrier.h
index 26eec3ed..01d8a9cf 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/barrier.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/barrier.h
@@ -37,4 +37,6 @@
 #define nvgpu_read_barrier_depends() __nvgpu_read_barrier_depends()
 #define nvgpu_smp_read_barrier_depends() __nvgpu_smp_read_barrier_depends()
 
+#define NV_ACCESS_ONCE(x)       __NV_ACCESS_ONCE(x)
+
 #endif /* __NVGPU_BARRIER_H__ */
diff --git a/drivers/gpu/nvgpu/include/nvgpu/linux/barrier.h b/drivers/gpu/nvgpu/include/nvgpu/linux/barrier.h
index e7b83ee8..b20f9462 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/linux/barrier.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/linux/barrier.h
@@ -30,4 +30,6 @@
 #define __nvgpu_read_barrier_depends()  read_barrier_depends()
 #define __nvgpu_smp_read_barrier_depends()      smp_read_barrier_depends()
 
+#define __NV_ACCESS_ONCE(x)     ACCESS_ONCE(x)
+
 #endif /* __NVGPU_BARRIER_LINUX_H__ */