diff --git a/drivers/gpu/drm/radeon/r600_blit.c b/drivers/gpu/drm/radeon/r600_blit.c
index 7d8ac42e38460338f80fdbcb2489f49907cbb69e..661fec2a2cc144bf16df85171e7aa498352e84b7 100644
--- a/drivers/gpu/drm/radeon/r600_blit.c
+++ b/drivers/gpu/drm/radeon/r600_blit.c
@@ -499,7 +499,7 @@ set_default_state(drm_radeon_private_t *dev_priv)
  * as the fractional bits will not fit in a float.  (It would be better to
  * round towards even as the fpu does, but that is slower.)
  */
-uint32_t int2float(uint32_t x)
+__pure uint32_t int2float(uint32_t x)
 {
 	uint32_t msb, exponent, fraction;
 
diff --git a/drivers/gpu/drm/radeon/r600_blit_shaders.h b/drivers/gpu/drm/radeon/r600_blit_shaders.h
index e17c2cbc66274749944f3082b0443a8fd6813810..2f3ce7a75976d1757e227b3373c16a9d048bf52a 100644
--- a/drivers/gpu/drm/radeon/r600_blit_shaders.h
+++ b/drivers/gpu/drm/radeon/r600_blit_shaders.h
@@ -35,5 +35,5 @@ extern const u32 r6xx_default_state[];
 extern const u32 r6xx_ps_size, r6xx_vs_size;
 extern const u32 r6xx_default_size, r7xx_default_size;
 
-uint32_t int2float(uint32_t x);
+__pure uint32_t int2float(uint32_t x);
 #endif