gpu: nvgpu: Replace kref for refcounting in nvgpu

- added wrapper struct nvgpu_ref over nvgpu_atomic_t
- added nvgpu_ref_* APIs to access the above struct

JIRA NVGPU-140

Change-Id: Id47f897995dd4721751f7610b6d4d4fbfe4d6b9a
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1540899
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/vm.h b/drivers/gpu/nvgpu/include/nvgpu/vm.h
index 255b4361..b5c64c99 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/vm.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/vm.h
@@ -88,7 +88,7 @@ struct nvgpu_mapped_buf {
         u64 size;
         struct dma_buf *dmabuf;
         struct sg_table *sgt;
-        struct kref ref;
+        struct nvgpu_ref ref;
         u32 user_mapped;
         bool own_mem_ref;
         u32 pgsz_idx;
@@ -142,7 +142,7 @@ struct vm_gk20a {
 
         const struct gk20a_mmu_level *mmu_levels;
 
-        struct kref ref;
+        struct nvgpu_ref ref;
 
         struct nvgpu_mutex update_gmmu_lock;