Re: [PATCH] drm/amdgpu: do not initialise global variables to 0 or NULL

[Christian König]

Am 02.11.20 um 20:43 schrieb Alex Deucher:
> On Mon, Nov 2, 2020 at 1:42 PM Deepak R Varma <mh12gx2825@xxxxxxxxx> wrote:
> > 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).
> I agree that this is technically correct, but a lot of people don't
> seem to know that so we get a lot of comments about this code for the
> variables that are not explicitly set.  Seems less confusing to
> initialize them even if it not necessary.  I don't have a particularly
> strong opinion on it however.

Agree with Alex.

Especially for the module parameters we should have a explicit init 
value for documentation purposes, even when it is 0.

Christian.

> Alex
>
> > Signed-off-by: Deepak R Varma <mh12gx2825@xxxxxxxxx>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 46 ++++++++++++-------------
> >   drivers/gpu/drm/amd/amdgpu/atom.c       |  4 +--
> >   2 files changed, 25 insertions(+), 25 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > index 8ab6126ff70c..6de94c46bc91 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > +++ b/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];
> > @@ -113,43 +113,43 @@ 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;
> > -char *amdgpu_disable_cu = NULL;
> > -char *amdgpu_virtual_display = NULL;
> > +char *amdgpu_disable_cu;
> > +char *amdgpu_virtual_display;
> >   /* 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*/
> > -uint amdgpu_dc_feature_mask = 0;
> > -uint amdgpu_dc_debug_mask = 0;
> > +uint amdgpu_dc_feature_mask;
> > +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;
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/atom.c b/drivers/gpu/drm/amd/amdgpu/atom.c
> > index 696e97ab77eb..46c00ee580b1 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/atom.c
> > +++ b/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)
> >   {
> > --
> > 2.25.1
> >
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