[v3] drm/msm/a6xx: use __unused__ to fix compiler warnings for gen7_* includes

[PATCH v3] drm/msm/a6xx: use __unused__ to fix compiler warnings for gen7_* includes

Posted by Abhinav Kumar 1 year, 8 months ago

GCC diagnostic pragma method throws below warnings in some of the versions

drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:16:9: warning: unknown
option after '#pragma GCC diagnostic' kind [-Wpragmas]
  #pragma GCC diagnostic ignored "-Wunused-const-variable"
          ^
In file included from drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:18:0:
drivers/gpu/drm/msm/adreno/adreno_gen7_0_0_snapshot.h:924:19: warning:
'gen7_0_0_external_core_regs' defined but not used [-Wunused-variable]
  static const u32 *gen7_0_0_external_core_regs[] = {
                    ^
In file included from drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:19:0:
drivers/gpu/drm/msm/adreno/adreno_gen7_2_0_snapshot.h:748:19: warning:
'gen7_2_0_external_core_regs' defined but not used [-Wunused-variable]
  static const u32 *gen7_2_0_external_core_regs[] = {
                    ^
In file included from drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:20:0:
drivers/gpu/drm/msm/adreno/adreno_gen7_9_0_snapshot.h:1188:43: warning:
'gen7_9_0_sptp_clusters' defined but not used [-Wunused-variable]
  static struct gen7_sptp_cluster_registers gen7_9_0_sptp_clusters[] = {
                                            ^
drivers/gpu/drm/msm/adreno/adreno_gen7_9_0_snapshot.h:1438:19: warning:
'gen7_9_0_external_core_regs' defined but not used [-Wunused-variable]
  static const u32 *gen7_9_0_external_core_regs[] = {

Remove GCC version dependency by using __unused__ for the unused gen7_* includes.

Changes in v2:
	- Fix the warnings in the commit text
	- Use __attribute((__unused__)) instead of local assignment

changes in v3:
	- drop the Link from the auto add

Fixes: 64d6255650d4 ("drm/msm: More fully implement devcoredump for a7xx")
Suggested-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
index 0a7717a4fc2f..a958e2b3c025 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
@@ -8,19 +8,15 @@
 #include "a6xx_gpu_state.h"
 #include "a6xx_gmu.xml.h"
 
-/* Ignore diagnostics about register tables that we aren't using yet. We don't
- * want to modify these headers too much from their original source.
- */
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-variable"
-#pragma GCC diagnostic ignored "-Wunused-const-variable"
+static const unsigned int *gen7_0_0_external_core_regs[] __attribute((__unused__));
+static const unsigned int *gen7_2_0_external_core_regs[] __attribute((__unused__));
+static const unsigned int *gen7_9_0_external_core_regs[] __attribute((__unused__));
+static struct gen7_sptp_cluster_registers gen7_9_0_sptp_clusters[] __attribute((__unused__));
 
 #include "adreno_gen7_0_0_snapshot.h"
 #include "adreno_gen7_2_0_snapshot.h"
 #include "adreno_gen7_9_0_snapshot.h"
 
-#pragma GCC diagnostic pop
-
 struct a6xx_gpu_state_obj {
 	const void *handle;
 	u32 *data;
-- 
2.44.0

Re: [PATCH v3] drm/msm/a6xx: use __unused__ to fix compiler warnings for gen7_* includes

Posted by Nathan Chancellor 1 year, 8 months ago

Hi Abhinav,

Just a drive by style comment.

On Tue, Jun 04, 2024 at 05:38:28PM -0700, Abhinav Kumar wrote:
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> index 0a7717a4fc2f..a958e2b3c025 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
> @@ -8,19 +8,15 @@
>  #include "a6xx_gpu_state.h"
>  #include "a6xx_gmu.xml.h"
>  
> -/* Ignore diagnostics about register tables that we aren't using yet. We don't
> - * want to modify these headers too much from their original source.
> - */
> -#pragma GCC diagnostic push
> -#pragma GCC diagnostic ignored "-Wunused-variable"
> -#pragma GCC diagnostic ignored "-Wunused-const-variable"
> +static const unsigned int *gen7_0_0_external_core_regs[] __attribute((__unused__));
> +static const unsigned int *gen7_2_0_external_core_regs[] __attribute((__unused__));
> +static const unsigned int *gen7_9_0_external_core_regs[] __attribute((__unused__));
> +static struct gen7_sptp_cluster_registers gen7_9_0_sptp_clusters[] __attribute((__unused__));

Please do not open code attributes. This is available as either
'__always_unused' or '__maybe_unused', depending on the context.
checkpatch would have warned about this if it was '__attribute__'
instead of '__attribute'.

Cheers,
Nathan

Re: [PATCH v3] drm/msm/a6xx: use __unused__ to fix compiler warnings for gen7_* includes

Posted by Abhinav Kumar 1 year, 8 months ago

Hi Nathan

On 6/5/2024 11:05 AM, Nathan Chancellor wrote:
> Hi Abhinav,
> 
> Just a drive by style comment.
> 
> On Tue, Jun 04, 2024 at 05:38:28PM -0700, Abhinav Kumar wrote:
>> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
>> index 0a7717a4fc2f..a958e2b3c025 100644
>> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
>> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
>> @@ -8,19 +8,15 @@
>>   #include "a6xx_gpu_state.h"
>>   #include "a6xx_gmu.xml.h"
>>   
>> -/* Ignore diagnostics about register tables that we aren't using yet. We don't
>> - * want to modify these headers too much from their original source.
>> - */
>> -#pragma GCC diagnostic push
>> -#pragma GCC diagnostic ignored "-Wunused-variable"
>> -#pragma GCC diagnostic ignored "-Wunused-const-variable"
>> +static const unsigned int *gen7_0_0_external_core_regs[] __attribute((__unused__));
>> +static const unsigned int *gen7_2_0_external_core_regs[] __attribute((__unused__));
>> +static const unsigned int *gen7_9_0_external_core_regs[] __attribute((__unused__));
>> +static struct gen7_sptp_cluster_registers gen7_9_0_sptp_clusters[] __attribute((__unused__));
> 
> Please do not open code attributes. This is available as either
> '__always_unused' or '__maybe_unused', depending on the context.
> checkpatch would have warned about this if it was '__attribute__'
> instead of '__attribute'.
> 

Thanks for the note. Let me update the patch to use __always_unused.

> Cheers,
> Nathan

Re: [PATCH v3] drm/msm/a6xx: use __unused__ to fix compiler warnings for gen7_* includes

Posted by Dmitry Baryshkov 1 year, 8 months ago

On Tue, Jun 04, 2024 at 05:38:28PM -0700, Abhinav Kumar wrote:
> GCC diagnostic pragma method throws below warnings in some of the versions
> 
> drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:16:9: warning: unknown
> option after '#pragma GCC diagnostic' kind [-Wpragmas]
>   #pragma GCC diagnostic ignored "-Wunused-const-variable"
>           ^
> In file included from drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:18:0:
> drivers/gpu/drm/msm/adreno/adreno_gen7_0_0_snapshot.h:924:19: warning:
> 'gen7_0_0_external_core_regs' defined but not used [-Wunused-variable]
>   static const u32 *gen7_0_0_external_core_regs[] = {
>                     ^
> In file included from drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:19:0:
> drivers/gpu/drm/msm/adreno/adreno_gen7_2_0_snapshot.h:748:19: warning:
> 'gen7_2_0_external_core_regs' defined but not used [-Wunused-variable]
>   static const u32 *gen7_2_0_external_core_regs[] = {
>                     ^
> In file included from drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:20:0:
> drivers/gpu/drm/msm/adreno/adreno_gen7_9_0_snapshot.h:1188:43: warning:
> 'gen7_9_0_sptp_clusters' defined but not used [-Wunused-variable]
>   static struct gen7_sptp_cluster_registers gen7_9_0_sptp_clusters[] = {
>                                             ^
> drivers/gpu/drm/msm/adreno/adreno_gen7_9_0_snapshot.h:1438:19: warning:
> 'gen7_9_0_external_core_regs' defined but not used [-Wunused-variable]
>   static const u32 *gen7_9_0_external_core_regs[] = {
> 
> Remove GCC version dependency by using __unused__ for the unused gen7_* includes.
> 
> Changes in v2:
> 	- Fix the warnings in the commit text
> 	- Use __attribute((__unused__)) instead of local assignment
> 
> changes in v3:
> 	- drop the Link from the auto add
> 
> Fixes: 64d6255650d4 ("drm/msm: More fully implement devcoredump for a7xx")
> Suggested-by: Rob Clark <robdclark@chromium.org>
> Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
> 


Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

-- 
With best wishes
Dmitry