diff --git a/drivers/gpu/nvgpu/include/nvgpu/io.h b/drivers/gpu/nvgpu/include/nvgpu/io.h
index 822443c7c..c5cef7c07 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/io.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/io.h
@@ -55,6 +55,7 @@ struct gk20a;
  */
 void nvgpu_writel(struct gk20a *g, u32 r, u32 v);
 
+#ifdef CONFIG_NVGPU_DGPU
 /**
  * @brief Write a value to GPU register without an ordering constraint.
  *
@@ -69,6 +70,7 @@ void nvgpu_writel(struct gk20a *g, u32 r, u32 v);
  * @return None.
  */
 void nvgpu_writel_relaxed(struct gk20a *g, u32 r, u32 v);
+#endif
 
 /**
  * @brief Read a value from a GPU register.
@@ -112,6 +114,7 @@ u32 nvgpu_readl_impl(struct gk20a *g, u32 r);
  */
 void nvgpu_writel_check(struct gk20a *g, u32 r, u32 v);
 
+#ifdef CONFIG_NVGPU_NON_FUSA
 /**
  * @brief Ensure write to a GPU register.
  *
@@ -125,6 +128,7 @@ void nvgpu_writel_check(struct gk20a *g, u32 r, u32 v);
  * @return None.
  */
 void nvgpu_writel_loop(struct gk20a *g, u32 r, u32 v);
+#endif
 
 /**
  * @brief Write a value to an already mapped bar1 io-region.
diff --git a/drivers/gpu/nvgpu/os/posix/posix-io.c b/drivers/gpu/nvgpu/os/posix/posix-io.c
index ce05b9e7b..202193acc 100644
--- a/drivers/gpu/nvgpu/os/posix/posix-io.c
+++ b/drivers/gpu/nvgpu/os/posix/posix-io.c
@@ -76,10 +76,12 @@ void nvgpu_writel(struct gk20a *g, u32 r, u32 v)
 	callbacks->writel(g, &access);
 }
 
+#ifdef CONFIG_NVGPU_DGPU
 void nvgpu_writel_relaxed(struct gk20a *g, u32 r, u32 v)
 {
 	nvgpu_writel(g, r, v);
 }
+#endif
 
 u32 nvgpu_readl(struct gk20a *g, u32 r)
 {
@@ -107,10 +109,12 @@ u32 nvgpu_readl(struct gk20a *g, u32 r)
 	return access.value;
 }
 
+#ifdef CONFIG_NVGPU_NON_FUSA
 void nvgpu_writel_loop(struct gk20a *g, u32 r, u32 v)
 {
 	BUG();
 }
+#endif
 
 u32 nvgpu_readl_impl(struct gk20a *g, u32 r)
 {