drm/amdgpu: do not initialise global variables to 0 or NULL

Initializing global variable to 0 or NULL is not necessary and should
be avoided. Issue reported by checkpatch script as:
ERROR: do not initialise globals to 0 (or NULL).
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -94,16 +94,16 @@
 #define KMS_DRIVER_MINOR	40
 #define KMS_DRIVER_PATCHLEVEL	0
 
-int amdgpu_vram_limit = 0;
-int amdgpu_vis_vram_limit = 0;
+int amdgpu_vram_limit;
+int amdgpu_vis_vram_limit;
 int amdgpu_gart_size = -1; /* auto */
 int amdgpu_gtt_size = -1; /* auto */
 int amdgpu_moverate = -1; /* auto */
-int amdgpu_benchmarking = 0;
-int amdgpu_testing = 0;
+int amdgpu_benchmarking;
+int amdgpu_testing;
 int amdgpu_audio = -1;
-int amdgpu_disp_priority = 0;
-int amdgpu_hw_i2c = 0;
+int amdgpu_disp_priority;
+int amdgpu_hw_i2c;
 int amdgpu_pcie_gen2 = -1;
 int amdgpu_msi = -1;
 char amdgpu_lockup_timeout[AMDGPU_MAX_TIMEOUT_PARAM_LENGTH];
@@ -113,19 +113,19 @@ int amdgpu_aspm = -1;
 int amdgpu_runtime_pm = -1;
 uint amdgpu_ip_block_mask = 0xffffffff;
 int amdgpu_bapm = -1;
-int amdgpu_deep_color = 0;
+int amdgpu_deep_color;
 int amdgpu_vm_size = -1;
 int amdgpu_vm_fragment_size = -1;
 int amdgpu_vm_block_size = -1;
-int amdgpu_vm_fault_stop = 0;
-int amdgpu_vm_debug = 0;
+int amdgpu_vm_fault_stop;
+int amdgpu_vm_debug;
 int amdgpu_vm_update_mode = -1;
-int amdgpu_exp_hw_support = 0;
+int amdgpu_exp_hw_support;
 int amdgpu_dc = -1;
 int amdgpu_sched_jobs = 32;
 int amdgpu_sched_hw_submission = 2;
-uint amdgpu_pcie_gen_cap = 0;
-uint amdgpu_pcie_lane_cap = 0;
+uint amdgpu_pcie_gen_cap;
+uint amdgpu_pcie_lane_cap;
 uint amdgpu_cg_mask = 0xffffffff;
 uint amdgpu_pg_mask = 0xffffffff;
 uint amdgpu_sdma_phase_quantum = 32;
@@ -133,13 +133,13 @@ char *amdgpu_disable_cu = NULL;
 char *amdgpu_virtual_display = NULL;
 /* OverDrive(bit 14) disabled by default*/
 uint amdgpu_pp_feature_mask = 0xffffbfff;
-uint amdgpu_force_long_training = 0;
-int amdgpu_job_hang_limit = 0;
+uint amdgpu_force_long_training;
+int amdgpu_job_hang_limit;
 int amdgpu_lbpw = -1;
 int amdgpu_compute_multipipe = -1;
 int amdgpu_gpu_recovery = -1; /* auto */
-int amdgpu_emu_mode = 0;
-uint amdgpu_smu_memory_pool_size = 0;
+int amdgpu_emu_mode;
+uint amdgpu_smu_memory_pool_size;
 /*
  * FBC (bit 0) disabled by default
  * MULTI_MON_PP_MCLK_SWITCH (bit 1) enabled by default
@@ -150,14 +150,14 @@ uint amdgpu_smu_memory_pool_size = 0;
  * PSR (bit 3) disabled by default
  */
 uint amdgpu_dc_feature_mask = 2;
-uint amdgpu_dc_debug_mask = 0;
+uint amdgpu_dc_debug_mask;
 int amdgpu_async_gfx_ring = 1;
-int amdgpu_mcbp = 0;
+int amdgpu_mcbp;
 int amdgpu_discovery = -1;
-int amdgpu_mes = 0;
+int amdgpu_mes;
 int amdgpu_noretry = -1;
 int amdgpu_force_asic_type = -1;
-int amdgpu_tmz = 0;
+int amdgpu_tmz;
 int amdgpu_reset_method = -1; /* auto */
 int amdgpu_num_kcq = -1;
 
@@ -772,7 +772,7 @@ module_param_named(dcdebugmask, amdgpu_dc_debug_mask, uint, 0444);
  * Defaults to 0, or disabled. Userspace can still override this level later
  * after boot.
  */
-uint amdgpu_dm_abm_level = 0;
+uint amdgpu_dm_abm_level;
 MODULE_PARM_DESC(abmlevel, "ABM level (0 = off (default), 1-4 = backlight reduction level) ");
 module_param_named(abmlevel, amdgpu_dm_abm_level, uint, 0444);
 

drivers/gpu/drm/amd/amdgpu/atom.c

@@ -66,7 +66,7 @@ typedef struct {
 	bool abort;
 } atom_exec_context;
 
-int amdgpu_atom_debug = 0;
+int amdgpu_atom_debug;
 static int amdgpu_atom_execute_table_locked(struct atom_context *ctx, int index, uint32_t *params);
 int amdgpu_atom_execute_table(struct atom_context *ctx, int index, uint32_t *params);
 
@@ -88,7 +88,7 @@ static int atom_dst_to_src[8][4] = {
 };
 static int atom_def_dst[8] = { 0, 0, 1, 2, 0, 1, 2, 3 };
 
-static int debug_depth = 0;
+static int debug_depth;
 #ifdef ATOM_DEBUG
 static void debug_print_spaces(int n)
 {