gpu: nvgpu: fix issue with CONFIG_DEBUG_FS=n

following compilation error are reported with CONFIG_DEBUG_FS=n:

pci.c:246:7: error: 'struct mm_gk20a' has no member named 'ltc_enabled'
pci.c:247:7: error: 'struct mm_gk20a' has no member named 'ltc_enabled_debug'
possible compilation error(reported sometime):
gk20a_allocator.c:1163:13: error: 'gk20a_alloc_debugfs_init' defined
but not used
fixed by adding '#ifdef CONFIG_DEBUG_FS' for debug only code.

following variables from gk20a.c are not initialized from
CONFIG_DEBUG_FS=n path, it will cause kernel oops when booting:

	gk20a->mm.bypass_smmu = platform->bypass_smmu;
	gk20a->mm.disable_bigpage = platform->disable_bigpage;
	gk20a->mm.has_physical_mode = true;
fix it by move them out from '#ifdef CONFIG_DEBUG_FS' section.

Bug 1778001

Change-Id: Ic2da36b3f500882748ee46a5150903244b697761
Signed-off-by: David Pu <dpu@nvidia.com>
Reviewed-on: http://git-master/r/1167358
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

3 files changed, 9 insertions, 4 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index db77d40f..03e16913 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -1562,13 +1562,14 @@ static int gk20a_probe(struct platform_device *dev)
 
         gk20a_create_sysfs(&dev->dev);
 
+        gk20a->mm.bypass_smmu = platform->bypass_smmu;
+        gk20a->mm.disable_bigpage = platform->disable_bigpage;
+        gk20a->mm.has_physical_mode = true;
+
 #ifdef CONFIG_DEBUG_FS
         spin_lock_init(&gk20a->debugfs_lock);
         gk20a->mm.ltc_enabled = true;
         gk20a->mm.ltc_enabled_debug = true;
-        gk20a->mm.bypass_smmu = platform->bypass_smmu;
-        gk20a->mm.disable_bigpage = platform->disable_bigpage;
-        gk20a->mm.has_physical_mode = true;
         gk20a->debugfs_ltc_enabled =
                         debugfs_create_bool("ltc_enabled", S_IRUGO|S_IWUSR,
                                  platform->debugfs,
diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c b/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c
index a7378956..2b351492 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c
@@ -1,7 +1,7 @@
 /*
  * gk20a allocator
  *
- * Copyright (c) 2011-2015, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2011-2016, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -1160,6 +1160,7 @@ static void balloc_init_alloc_debug(struct gk20a_allocator *a)
                                                a, &__alloc_fops);
 }
 
+#ifdef CONFIG_DEBUG_FS
 void gk20a_alloc_debugfs_init(struct platform_device *pdev)
 {
         struct gk20a_platform *platform = platform_get_drvdata(pdev);
@@ -1172,3 +1173,4 @@ void gk20a_alloc_debugfs_init(struct platform_device *pdev)
         debugfs_create_u32("tracing", 0664, balloc_debugfs_root,
                            &balloc_tracing_on);
 }
+#endif
diff --git a/drivers/gpu/nvgpu/pci.c b/drivers/gpu/nvgpu/pci.c
index a899c0cf..01c7a2dc 100644
--- a/drivers/gpu/nvgpu/pci.c
+++ b/drivers/gpu/nvgpu/pci.c
@@ -243,8 +243,10 @@ static int nvgpu_pci_probe(struct pci_dev *pdev,
 
         g->mm.has_physical_mode = false;
         g->mm.vidmem_is_vidmem = true;
+#ifdef CONFIG_DEBUG_FS
         g->mm.ltc_enabled = true;
         g->mm.ltc_enabled_debug = true;
+#endif
         g->mm.bypass_smmu = platform->bypass_smmu;
         g->mm.disable_bigpage = platform->disable_bigpage;