gpu: nvgpu: fix build error when CONFIG_DEBUG_FS=n

adding 'ifdef CONFIG_DEBUG_FS' check to fix following compilation error
when CONFIG_DEBUG_FS=n(which is used for Android 'production' build):

mm_gk20a.c: In function 'gk20a_mm_debugfs_init':
mm_gk20a.c:4824:2: error: implicit declaration of function 
'debugfs_create_x64' [-Werror=implicit-function-declaration]


Bug 1778001

Change-Id: I785288a37b96c391b84925d5971d2691cf80206e
Signed-off-by: David Pu <dpu@nvidia.com>
Reviewed-on: http://git-master/r/1210393
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
index 7ace85d7..7c731890 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
@@ -4800,6 +4800,7 @@ clean_up:
         return err;
 }
 
+#ifdef CONFIG_DEBUG_FS
 void gk20a_mm_debugfs_init(struct device *dev)
 {
         struct gk20a_platform *platform = dev_get_drvdata(dev);
@@ -4812,6 +4813,7 @@ void gk20a_mm_debugfs_init(struct device *dev)
         debugfs_create_bool("force_pramin", 0664, gpu_root,
                            &g->mm.force_pramin);
 }
+#endif
 
 void gk20a_init_mm(struct gpu_ops *gops)
 {