[PATCH -next] drm/amdgpu: remove set but not used variable 'ring'

[PATCH -next] drm/amdgpu: remove set but not used variable 'ring'

[YueHaibing]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/amd/amdgpu/psp_v10_0.c: In function 'psp_v10_0_ring_stop':
drivers/gpu/drm/amd/amdgpu/psp_v10_0.c:230:19: warning:
 variable 'ring' set but not used [-Wunused-but-set-variable]

It not used since commit
4ef72453311a ("drm/amdgpu: added api for stopping psp ring (v2)")

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 drivers/gpu/drm/amd/amdgpu/psp_v10_0.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/psp_v10_0.c b/drivers/gpu/drm/amd/amdgpu/psp_v10_0.c
index 295c220..d78b430 100644
--- a/drivers/gpu/drm/amd/amdgpu/psp_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/psp_v10_0.c
@@ -240,12 +240,9 @@ static int psp_v10_0_ring_stop(struct psp_context *psp,
 			       enum psp_ring_type ring_type)
 {
 	int ret = 0;
-	struct psp_ring *ring;
 	unsigned int psp_ring_reg = 0;
 	struct amdgpu_device *adev = psp->adev;
 
-	ring = &psp->km_ring;
-
 	/* Write the ring destroy command to C2PMSG_64 */
 	psp_ring_reg = 3 << 16;
 	WREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_64, psp_ring_reg);

RE: [PATCH -next] drm/amdgpu: remove set but not used variable 'ring'

[Huang, Ray]

> -----Original Message-----
> From: YueHaibing [mailto:yuehaibing@huawei.com]
> Sent: Thursday, November 15, 2018 6:52 PM
> To: Deucher, Alexander <Alexander.Deucher@amd.com>; Koenig, Christian
> <Christian.Koenig@amd.com>; Zhou, David(ChunMing)
> <David1.Zhou@amd.com>; airlied@linux.ie; Liu, Shaoyun
> <Shaoyun.Liu@amd.com>; Francis, David <David.Francis@amd.com>; Huang,
> Ray <Ray.Huang@amd.com>; Xu, Feifei <Feifei.Xu@amd.com>; Gao, Likun
> <Likun.Gao@amd.com>
> Cc: YueHaibing <yuehaibing@huawei.com>; amd-gfx@lists.freedesktop.org;
> dri-devel@lists.freedesktop.org; linux-kernel@vger.kernel.org; kernel-
> janitors@vger.kernel.org
> Subject: [PATCH -next] drm/amdgpu: remove set but not used variable 'ring'
> 
> Fixes gcc '-Wunused-but-set-variable' warning:
> 
> drivers/gpu/drm/amd/amdgpu/psp_v10_0.c: In function
> 'psp_v10_0_ring_stop':
> drivers/gpu/drm/amd/amdgpu/psp_v10_0.c:230:19: warning:
>  variable 'ring' set but not used [-Wunused-but-set-variable]
> 
> It not used since commit
> 4ef72453311a ("drm/amdgpu: added api for stopping psp ring (v2)")

Thanks, please also remove the similar code in psp_v3_1. 
With that updates, patch is Reviewed-by: Huang Rui <ray.huang@amd.com>

> 
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/psp_v10_0.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/psp_v10_0.c
> b/drivers/gpu/drm/amd/amdgpu/psp_v10_0.c
> index 295c220..d78b430 100644
> --- a/drivers/gpu/drm/amd/amdgpu/psp_v10_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/psp_v10_0.c
> @@ -240,12 +240,9 @@ static int psp_v10_0_ring_stop(struct psp_context
> *psp,
>  			       enum psp_ring_type ring_type)  {
>  	int ret = 0;
> -	struct psp_ring *ring;
>  	unsigned int psp_ring_reg = 0;
>  	struct amdgpu_device *adev = psp->adev;
> 
> -	ring = &psp->km_ring;
> -
>  	/* Write the ring destroy command to C2PMSG_64 */
>  	psp_ring_reg = 3 << 16;
>  	WREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_64, psp_ring_reg);
> 
> 
> 
> 

Re: [PATCH -next] drm/amdgpu: remove set but not used variable 'ring'

[YueHaibing]

On 2018/11/15 19:49, Huang, Ray wrote:
>> -----Original Message-----
>> From: YueHaibing [mailto:yuehaibing@huawei.com]
>> Sent: Thursday, November 15, 2018 6:52 PM
>> To: Deucher, Alexander <Alexander.Deucher@amd.com>; Koenig, Christian
>> <Christian.Koenig@amd.com>; Zhou, David(ChunMing)
>> <David1.Zhou@amd.com>; airlied@linux.ie; Liu, Shaoyun
>> <Shaoyun.Liu@amd.com>; Francis, David <David.Francis@amd.com>; Huang,
>> Ray <Ray.Huang@amd.com>; Xu, Feifei <Feifei.Xu@amd.com>; Gao, Likun
>> <Likun.Gao@amd.com>
>> Cc: YueHaibing <yuehaibing@huawei.com>; amd-gfx@lists.freedesktop.org;
>> dri-devel@lists.freedesktop.org; linux-kernel@vger.kernel.org; kernel-
>> janitors@vger.kernel.org
>> Subject: [PATCH -next] drm/amdgpu: remove set but not used variable 'ring'
>>
>> Fixes gcc '-Wunused-but-set-variable' warning:
>>
>> drivers/gpu/drm/amd/amdgpu/psp_v10_0.c: In function
>> 'psp_v10_0_ring_stop':
>> drivers/gpu/drm/amd/amdgpu/psp_v10_0.c:230:19: warning:
>>  variable 'ring' set but not used [-Wunused-but-set-variable]
>>
>> It not used since commit
>> 4ef72453311a ("drm/amdgpu: added api for stopping psp ring (v2)")
> 
> Thanks, please also remove the similar code in psp_v3_1. 
> With that updates, patch is Reviewed-by: Huang Rui <ray.huang@amd.com>
> 

Ok, will send v2.

>>
>> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
>> ---
>>  drivers/gpu/drm/amd/amdgpu/psp_v10_0.c | 3 ---
>>  1 file changed, 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/psp_v10_0.c
>> b/drivers/gpu/drm/amd/amdgpu/psp_v10_0.c
>> index 295c220..d78b430 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/psp_v10_0.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/psp_v10_0.c
>> @@ -240,12 +240,9 @@ static int psp_v10_0_ring_stop(struct psp_context
>> *psp,
>>  			       enum psp_ring_type ring_type)  {
>>  	int ret = 0;
>> -	struct psp_ring *ring;
>>  	unsigned int psp_ring_reg = 0;
>>  	struct amdgpu_device *adev = psp->adev;
>>
>> -	ring = &psp->km_ring;
>> -
>>  	/* Write the ring destroy command to C2PMSG_64 */
>>  	psp_ring_reg = 3 << 16;
>>  	WREG32_SOC15(MP0, 0, mmMP0_SMN_C2PMSG_64, psp_ring_reg);
>>
>>
>>
>>
> 
> 
> .
> 

[PATCH -next] drm/amdgpu: remove set but not used variables 'vm, bo'

[YueHaibing]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c: In function 'update_gpuvm_pte':
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c:840:20: warning:
 variable 'bo' set but not used [-Wunused-but-set-variable]

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c:838:20: warning:
 variable 'vm' set but not used [-Wunused-but-set-variable]

They're never used since introduction in a46a2cd103a8 ("drm/amdgpu: Add GPUVM
memory management functions for KFD")

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index d7b10d79f1de..63daf758cd03 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -837,13 +837,7 @@ static int update_gpuvm_pte(struct amdgpu_device *adev,
 		struct amdgpu_sync *sync)
 {
 	int ret;
-	struct amdgpu_vm *vm;
-	struct amdgpu_bo_va *bo_va;
-	struct amdgpu_bo *bo;
-
-	bo_va = entry->bo_va;
-	vm = bo_va->base.vm;
-	bo = bo_va->base.bo;
+	struct amdgpu_bo_va *bo_va = entry->bo_va;
 
 	/* Update the page tables  */
 	ret = amdgpu_vm_bo_update(adev, bo_va, false);

Re: [PATCH -next] drm/amdgpu: remove set but not used variables 'vm, bo'

[Alex Deucher]

Applied.  thanks!

On Wed, Feb 20, 2019 at 3:05 AM YueHaibing <yuehaibing@huawei.com> wrote:
>
> Fixes gcc '-Wunused-but-set-variable' warning:
>
> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c: In function 'update_gpuvm_pte':
> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c:840:20: warning:
>  variable 'bo' set but not used [-Wunused-but-set-variable]
>
> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c:838:20: warning:
>  variable 'vm' set but not used [-Wunused-but-set-variable]
>
> They're never used since introduction in a46a2cd103a8 ("drm/amdgpu: Add GPUVM
> memory management functions for KFD")
>
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> index d7b10d79f1de..63daf758cd03 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> @@ -837,13 +837,7 @@ static int update_gpuvm_pte(struct amdgpu_device *adev,
>                 struct amdgpu_sync *sync)
>  {
>         int ret;
> -       struct amdgpu_vm *vm;
> -       struct amdgpu_bo_va *bo_va;
> -       struct amdgpu_bo *bo;
> -
> -       bo_va = entry->bo_va;
> -       vm = bo_va->base.vm;
> -       bo = bo_va->base.bo;
> +       struct amdgpu_bo_va *bo_va = entry->bo_va;
>
>         /* Update the page tables  */
>         ret = amdgpu_vm_bo_update(adev, bo_va, false);
>
>
>
>
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH -next] drm/amdgpu: remove set but not used variables 'ret'

[Mao Wenan]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
  int ret = 0;
      ^

It is never used since introduction in 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")

Signed-off-by: Mao Wenan <maowenan@huawei.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
index 0e6dba9..0bf4dd9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
@@ -246,12 +246,10 @@ static int init_pmu_by_type(struct amdgpu_device *adev,
 /* init amdgpu_pmu */
 int amdgpu_pmu_init(struct amdgpu_device *adev)
 {
-	int ret = 0;
-
 	switch (adev->asic_type) {
 	case CHIP_VEGA20:
 		/* init df */
-		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
+		init_pmu_by_type(adev, df_v3_6_attr_groups,
 				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
 				       DF_V3_6_MAX_COUNTERS);
 
-- 
2.7.4

Re: [PATCH -next] drm/amdgpu: remove set but not used variables 'ret'

[Julia Lawall]

[-- Attachment #1: Type: text/plain, Size: 1410 bytes --]



On Sat, 22 Jun 2019, Mao Wenan wrote:

> Fixes gcc '-Wunused-but-set-variable' warning:
>
> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
>   int ret = 0;
>       ^
>
> It is never used since introduction in 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")
>
> Signed-off-by: Mao Wenan <maowenan@huawei.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> index 0e6dba9..0bf4dd9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> @@ -246,12 +246,10 @@ static int init_pmu_by_type(struct amdgpu_device *adev,
>  /* init amdgpu_pmu */
>  int amdgpu_pmu_init(struct amdgpu_device *adev)
>  {
> -	int ret = 0;
> -
>  	switch (adev->asic_type) {
>  	case CHIP_VEGA20:
>  		/* init df */
> -		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
> +		init_pmu_by_type(adev, df_v3_6_attr_groups,
>  				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
>  				       DF_V3_6_MAX_COUNTERS);

Maybe it would be better to use ret?

If knowing whether the call has failed is really useless, then maybe the
return type should be void?

julia


>
> --
> 2.7.4
>
>

Re: [PATCH -next] drm/amdgpu: remove set but not used variables 'ret'

[maowenan]

On 2019/6/22 14:02, Julia Lawall wrote:
> 
> 
> On Sat, 22 Jun 2019, Mao Wenan wrote:
> 
>> Fixes gcc '-Wunused-but-set-variable' warning:
>>
>> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
>> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
>>   int ret = 0;
>>       ^
>>
>> It is never used since introduction in 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")
>>
>> Signed-off-by: Mao Wenan <maowenan@huawei.com>
>> ---
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 4 +---
>>  1 file changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>> index 0e6dba9..0bf4dd9 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>> @@ -246,12 +246,10 @@ static int init_pmu_by_type(struct amdgpu_device *adev,
>>  /* init amdgpu_pmu */
>>  int amdgpu_pmu_init(struct amdgpu_device *adev)
>>  {
>> -	int ret = 0;
>> -
>>  	switch (adev->asic_type) {
>>  	case CHIP_VEGA20:
>>  		/* init df */
>> -		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
>> +		init_pmu_by_type(adev, df_v3_6_attr_groups,
>>  				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
>>  				       DF_V3_6_MAX_COUNTERS);
> 
> Maybe it would be better to use ret?
> 
> If knowing whether the call has failed is really useless, then maybe the
> return type should be void?

right.

amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
which will use the return value.
amdgpu_device_init()
	r = amdgpu_pmu_init(adev);


thanks, I will send v2.
> 
> julia
> 
> 
>>
>> --
>> 2.7.4
>>
>>
> 

Re: [PATCH -next] drm/amdgpu: remove set but not used variables 'ret'

[Dan Carpenter]

On Sat, Jun 22, 2019 at 11:03:14AM +0800, Mao Wenan wrote:
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> index 0e6dba9..0bf4dd9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> @@ -246,12 +246,10 @@ static int init_pmu_by_type(struct amdgpu_device *adev,
>  /* init amdgpu_pmu */
>  int amdgpu_pmu_init(struct amdgpu_device *adev)
>  {
> -	int ret = 0;
> -
>  	switch (adev->asic_type) {
>  	case CHIP_VEGA20:
>  		/* init df */
> -		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
> +		init_pmu_by_type(adev, df_v3_6_attr_groups,
>  				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
>  				       DF_V3_6_MAX_COUNTERS);


You're resending this for other reasons, but don't forget to update the
indenting on the arguments so they still line up with the '('.

regards,
dan carpenter

[PATCH -next v2] drm/amdgpu: return 'ret' in amdgpu_pmu_init

[Mao Wenan]

There is one warning:
drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
  int ret = 0;
      ^
amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
which will use the return value. So it returns 'ret' for caller.
amdgpu_device_init()
	r = amdgpu_pmu_init(adev);

Fixes: 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")

Signed-off-by: Mao Wenan <maowenan@huawei.com>
---
 v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
 amdgpu_pmu_init().
 drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
index 0e6dba9..145e720 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
@@ -252,8 +252,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
 	case CHIP_VEGA20:
 		/* init df */
 		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
-				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
-				       DF_V3_6_MAX_COUNTERS);
+							   "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
+							   DF_V3_6_MAX_COUNTERS);
 
 		/* other pmu types go here*/
 		break;
@@ -261,7 +261,7 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
 		return 0;
 	}
 
-	return 0;
+	return ret;
 }
 
 
-- 
2.7.4

Re: [PATCH -next v2] drm/amdgpu: return 'ret' in amdgpu_pmu_init

[Julia Lawall]

[-- Attachment #1: Type: text/plain, Size: 1830 bytes --]



On Sat, 22 Jun 2019, Mao Wenan wrote:

> There is one warning:
> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
>   int ret = 0;
>       ^
> amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
> which will use the return value. So it returns 'ret' for caller.
> amdgpu_device_init()
> 	r = amdgpu_pmu_init(adev);
>
> Fixes: 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")
>
> Signed-off-by: Mao Wenan <maowenan@huawei.com>
> ---
>  v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
>  amdgpu_pmu_init().
>  drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> index 0e6dba9..145e720 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> @@ -252,8 +252,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
>  	case CHIP_VEGA20:
>  		/* init df */
>  		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
> -				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
> -				       DF_V3_6_MAX_COUNTERS);
> +							   "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
> +							   DF_V3_6_MAX_COUNTERS);
>
>  		/* other pmu types go here*/

I don't know what is the impact of the other pmu types that are planned
for the future.  Perhaps it would be better to abort the function
immediately in the case of a failure.

julia

>  		break;
> @@ -261,7 +261,7 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
>  		return 0;
>  	}
>
> -	return 0;
> +	return ret;
>  }
>
>
> --
> 2.7.4
>
>

Re: [PATCH -next v2] drm/amdgpu: return 'ret' in amdgpu_pmu_init

[maowenan]

On 2019/6/22 21:06, Julia Lawall wrote:
> 
> 
> On Sat, 22 Jun 2019, Mao Wenan wrote:
> 
>> There is one warning:
>> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
>> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
>>   int ret = 0;
>>       ^
>> amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
>> which will use the return value. So it returns 'ret' for caller.
>> amdgpu_device_init()
>> 	r = amdgpu_pmu_init(adev);
>>
>> Fixes: 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")
>>
>> Signed-off-by: Mao Wenan <maowenan@huawei.com>
>> ---
>>  v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
>>  amdgpu_pmu_init().
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>> index 0e6dba9..145e720 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>> @@ -252,8 +252,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
>>  	case CHIP_VEGA20:
>>  		/* init df */
>>  		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
>> -				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
>> -				       DF_V3_6_MAX_COUNTERS);
>> +							   "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
>> +							   DF_V3_6_MAX_COUNTERS);
>>
>>  		/* other pmu types go here*/
> 
> I don't know what is the impact of the other pmu types that are planned
> for the future.  Perhaps it would be better to abort the function
> immediately in the case of a failure.

I guess it would be better to use new function or new switch case clause to process different PMU types
in future.

> 
> julia
> 
>>  		break;
>> @@ -261,7 +261,7 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
>>  		return 0;
>>  	}
>>
>> -	return 0;
>> +	return ret;
>>  }
>>
>>
>> --
>> 2.7.4
>>
>>
> 

Re: [PATCH -next v2] drm/amdgpu: return 'ret' in amdgpu_pmu_init

[Julia Lawall]

[-- Attachment #1: Type: text/plain, Size: 2459 bytes --]



On Sat, 22 Jun 2019, maowenan wrote:

>
>
> On 2019/6/22 21:06, Julia Lawall wrote:
> >
> >
> > On Sat, 22 Jun 2019, Mao Wenan wrote:
> >
> >> There is one warning:
> >> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
> >> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
> >>   int ret = 0;
> >>       ^
> >> amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
> >> which will use the return value. So it returns 'ret' for caller.
> >> amdgpu_device_init()
> >> 	r = amdgpu_pmu_init(adev);
> >>
> >> Fixes: 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")
> >>
> >> Signed-off-by: Mao Wenan <maowenan@huawei.com>
> >> ---
> >>  v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
> >>  amdgpu_pmu_init().
> >>  drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 6 +++---
> >>  1 file changed, 3 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> >> index 0e6dba9..145e720 100644
> >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> >> @@ -252,8 +252,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
> >>  	case CHIP_VEGA20:
> >>  		/* init df */
> >>  		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
> >> -				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
> >> -				       DF_V3_6_MAX_COUNTERS);
> >> +							   "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
> >> +							   DF_V3_6_MAX_COUNTERS);
> >>
> >>  		/* other pmu types go here*/
> >
> > I don't know what is the impact of the other pmu types that are planned
> > for the future.  Perhaps it would be better to abort the function
> > immediately in the case of a failure.
>
> I guess it would be better to use new function or new switch case clause to process different PMU types
> in future.

I don't know.  But normally when an error may occur it is checked for
immediately, rather than just letting it go until the end of the function.
But maybe the developer know what is planned for the future for this
function.

julia

>
> >
> > julia
> >
> >>  		break;
> >> @@ -261,7 +261,7 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
> >>  		return 0;
> >>  	}
> >>
> >> -	return 0;
> >> +	return ret;
> >>  }
> >>
> >>
> >> --
> >> 2.7.4
> >>
> >>
> >
>
>

Re: [PATCH -next v2] drm/amdgpu: return 'ret' in amdgpu_pmu_init

[Joe Perches]

On Sat, 2019-06-22 at 21:05 +0800, Mao Wenan wrote:
> There is one warning:
> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
>   int ret = 0;
[]
>  v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
>  amdgpu_pmu_init().
[]
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
[]
> @@ -252,8 +252,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
>  	case CHIP_VEGA20:
>  		/* init df */
>  		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
> -				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
> -				       DF_V3_6_MAX_COUNTERS);
> +							   "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
> +							   DF_V3_6_MAX_COUNTERS);

trivia:

The indentation change seems superfluous and
appears to make the code harder to read.

You could also cc Jonathan Kim who wrote all of this.

Re: [PATCH -next] drm/amdgpu: remove set but not used variables 'ret'

[Dan Carpenter]

On Sat, Jun 22, 2019 at 01:43:19PM +0300, Dan Carpenter wrote:
> On Sat, Jun 22, 2019 at 11:03:14AM +0800, Mao Wenan wrote:
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> > index 0e6dba9..0bf4dd9 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> > @@ -246,12 +246,10 @@ static int init_pmu_by_type(struct amdgpu_device *adev,
> >  /* init amdgpu_pmu */
> >  int amdgpu_pmu_init(struct amdgpu_device *adev)
> >  {
> > -	int ret = 0;
> > -
> >  	switch (adev->asic_type) {
> >  	case CHIP_VEGA20:
> >  		/* init df */
> > -		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
> > +		init_pmu_by_type(adev, df_v3_6_attr_groups,
> >  				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
> >  				       DF_V3_6_MAX_COUNTERS);
> 
> 
> You're resending this for other reasons, but don't forget to update the
> indenting on the arguments so they still line up with the '('.
> 

Sorry, I was unclear.  If you pull the init_pmu_by_type( back 6
characters then you also need to pull the "DF" back 6 characters.

		init_pmu_by_type(adev, df_v3_6_attr_groups, "DF", "amdgpu_df",
				 PERF_TYPE_AMDGPU_DF, DF_V3_6_MAX_COUNTERS);

You can actually fit it into two lines afterwards.

regards,
dan carpenter

Re: [PATCH -next] drm/amdgpu: remove set but not used variables 'ret'

[Julia Lawall]

On Sun, 23 Jun 2019, Dan Carpenter wrote:

> On Sat, Jun 22, 2019 at 01:43:19PM +0300, Dan Carpenter wrote:
> > On Sat, Jun 22, 2019 at 11:03:14AM +0800, Mao Wenan wrote:
> > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> > > index 0e6dba9..0bf4dd9 100644
> > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> > > @@ -246,12 +246,10 @@ static int init_pmu_by_type(struct amdgpu_device *adev,
> > >  /* init amdgpu_pmu */
> > >  int amdgpu_pmu_init(struct amdgpu_device *adev)
> > >  {
> > > -	int ret = 0;
> > > -
> > >  	switch (adev->asic_type) {
> > >  	case CHIP_VEGA20:
> > >  		/* init df */
> > > -		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
> > > +		init_pmu_by_type(adev, df_v3_6_attr_groups,
> > >  				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
> > >  				       DF_V3_6_MAX_COUNTERS);
> >
> >
> > You're resending this for other reasons, but don't forget to update the
> > indenting on the arguments so they still line up with the '('.
> >
>
> Sorry, I was unclear.  If you pull the init_pmu_by_type( back 6
> characters then you also need to pull the "DF" back 6 characters.
>
> 		init_pmu_by_type(adev, df_v3_6_attr_groups, "DF", "amdgpu_df",
> 				 PERF_TYPE_AMDGPU_DF, DF_V3_6_MAX_COUNTERS);
>
> You can actually fit it into two lines afterwards.

My suggestion was to keep the ret = instead of discarding the indication
of failure, so I think that this is not relevant.

julia

Re: [PATCH -next v2] drm/amdgpu: return 'ret' in amdgpu_pmu_init

[maowenan]

On 2019/6/22 22:00, Julia Lawall wrote:
> 
> 
> On Sat, 22 Jun 2019, maowenan wrote:
> 
>>
>>
>> On 2019/6/22 21:06, Julia Lawall wrote:
>>>
>>>
>>> On Sat, 22 Jun 2019, Mao Wenan wrote:
>>>
>>>> There is one warning:
>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
>>>> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
>>>>   int ret = 0;
>>>>       ^
>>>> amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
>>>> which will use the return value. So it returns 'ret' for caller.
>>>> amdgpu_device_init()
>>>> 	r = amdgpu_pmu_init(adev);
>>>>
>>>> Fixes: 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")
>>>>
>>>> Signed-off-by: Mao Wenan <maowenan@huawei.com>
>>>> ---
>>>>  v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
>>>>  amdgpu_pmu_init().
>>>>  drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 6 +++---
>>>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>>>> index 0e6dba9..145e720 100644
>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>>>> @@ -252,8 +252,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
>>>>  	case CHIP_VEGA20:
>>>>  		/* init df */
>>>>  		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
>>>> -				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
>>>> -				       DF_V3_6_MAX_COUNTERS);
>>>> +							   "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
>>>> +							   DF_V3_6_MAX_COUNTERS);
>>>>
>>>>  		/* other pmu types go here*/
>>>
>>> I don't know what is the impact of the other pmu types that are planned
>>> for the future.  Perhaps it would be better to abort the function
>>> immediately in the case of a failure.
>>

OK, v3 will be sent.

>> I guess it would be better to use new function or new switch case clause to process different PMU types
>> in future.
> 
> I don't know.  But normally when an error may occur it is checked for
> immediately, rather than just letting it go until the end of the function.
> But maybe the developer know what is planned for the future for this
> function.
> 
> julia
> 
>>
>>>
>>> julia
>>>
>>>>  		break;
>>>> @@ -261,7 +261,7 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
>>>>  		return 0;
>>>>  	}
>>>>
>>>> -	return 0;
>>>> +	return ret;
>>>>  }
>>>>
>>>>
>>>> --
>>>> 2.7.4
>>>>
>>>>
>>>
>>
>>
> 

Re: [PATCH -next v2] drm/amdgpu: return 'ret' in amdgpu_pmu_init

[maowenan]

On 2019/6/23 2:13, Joe Perches wrote:
> On Sat, 2019-06-22 at 21:05 +0800, Mao Wenan wrote:
>> There is one warning:
>> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
>> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
>>   int ret = 0;
> []
>>  v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
>>  amdgpu_pmu_init().
> []
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> []
>> @@ -252,8 +252,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
>>  	case CHIP_VEGA20:
>>  		/* init df */
>>  		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
>> -				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
>> -				       DF_V3_6_MAX_COUNTERS);
>> +							   "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
>> +							   DF_V3_6_MAX_COUNTERS);
> 
> trivia:
> 
> The indentation change seems superfluous and
> appears to make the code harder to read.
> 
> You could also cc Jonathan Kim who wrote all of this.
I think this is just display issue in mail format. It is correct that in vi/vim.
The arguments are line up with '(' after my change.


@@ -252,8 +252,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)$
 ^Icase CHIP_VEGA20:$
 ^I^I/* init df */$
 ^I^Iret = init_pmu_by_type(adev, df_v3_6_attr_groups,$
-^I^I^I^I       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,$
-^I^I^I^I       DF_V3_6_MAX_COUNTERS);$
+^I^I^I^I^I^I^I   "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,$
+^I^I^I^I^I^I^I   DF_V3_6_MAX_COUNTERS);$
 $
 ^I^I/* other pmu types go here*/$
 ^I^Ibreak;$





> 
> 
> 
> .
> 

[PATCH -next v3] drm/amdgpu: return 'ret' immediately if failed in amdgpu_pmu_init

[Mao Wenan]

There is one warning:
drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
  int ret = 0;
      ^
amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
which will use the return value. So it should return 'ret' immediately if init_pmu_by_type() failed.
amdgpu_device_init()
	r = amdgpu_pmu_init(adev);

This patch is also to update the indenting on the arguments so they line up with the '('.

Fixes: 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")

Signed-off-by: Mao Wenan <maowenan@huawei.com>
---
 v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
 amdgpu_pmu_init().
 v2->v3: change the subject for this patch; return 'ret' immediately if failed to call init_pmu_by_type(). 

 drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
index 0e6dba9..b702322 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
@@ -252,8 +252,11 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
 	case CHIP_VEGA20:
 		/* init df */
 		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
-				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
-				       DF_V3_6_MAX_COUNTERS);
+							   "DF", "amdgpu_df",
+							   PERF_TYPE_AMDGPU_DF,
+							   DF_V3_6_MAX_COUNTERS);
+		if (ret)
+			return ret;
 
 		/* other pmu types go here*/
 		break;
-- 
2.7.4

Re: [PATCH -next v2] drm/amdgpu: return 'ret' in amdgpu_pmu_init

[Joe Perches]

On Mon, 2019-06-24 at 11:41 +0800, maowenan wrote:
> 
> On 2019/6/23 2:13, Joe Perches wrote:
> > On Sat, 2019-06-22 at 21:05 +0800, Mao Wenan wrote:
> > > There is one warning:
> > > drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
> > > drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
> > >   int ret = 0;
> > []
> > >  v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
> > >  amdgpu_pmu_init().
> > []
> > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> > []
> > > @@ -252,8 +252,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
> > >  	case CHIP_VEGA20:
> > >  		/* init df */
> > >  		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
> > > -				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
> > > -				       DF_V3_6_MAX_COUNTERS);
> > > +							   "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
> > > +							   DF_V3_6_MAX_COUNTERS);
> > 
> > trivia:
> > 
> > The indentation change seems superfluous and
> > appears to make the code harder to read.
> > 
> > You could also cc Jonathan Kim who wrote all of this.
> I think this is just display issue in mail format. It is correct that in vi/vim.
> The arguments are line up with '(' after my change.

Use 8 character tabs and try again please.

> @@ -252,8 +252,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)$
>  ^Icase CHIP_VEGA20:$
>  ^I^I/* init df */$
>  ^I^Iret = init_pmu_by_type(adev, df_v3_6_attr_groups,$
> -^I^I^I^I       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,$
> -^I^I^I^I       DF_V3_6_MAX_COUNTERS);$
> +^I^I^I^I^I^I^I   "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,$
> +^I^I^I^I^I^I^I   DF_V3_6_MAX_COUNTERS);$

Re: [PATCH -next v3] drm/amdgpu: return 'ret' immediately if failed in amdgpu_pmu_init

[Dan Carpenter]

On Mon, Jun 24, 2019 at 11:45:32AM +0800, Mao Wenan wrote:
> There is one warning:
> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
>   int ret = 0;
>       ^
> amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
> which will use the return value. So it should return 'ret' immediately if init_pmu_by_type() failed.
> amdgpu_device_init()
> 	r = amdgpu_pmu_init(adev);
> 
> This patch is also to update the indenting on the arguments so they line up with the '('.
> 
> Fixes: 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")
> 
> Signed-off-by: Mao Wenan <maowenan@huawei.com>
> ---
>  v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
>  amdgpu_pmu_init().
>  v2->v3: change the subject for this patch; return 'ret' immediately if failed to call init_pmu_by_type(). 
> 
>  drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> index 0e6dba9..b702322 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> @@ -252,8 +252,11 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
>  	case CHIP_VEGA20:
>  		/* init df */
>  		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
> -				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
> -				       DF_V3_6_MAX_COUNTERS);
> +							   "DF", "amdgpu_df",
> +							   PERF_TYPE_AMDGPU_DF,
> +							   DF_V3_6_MAX_COUNTERS);
> +		if (ret)
> +			return ret;

No no.  Sorry, the original indenting was correct and lined up with the
'(' character in 'init_pmu_by_type(', that's the way it should be.  If
we were to remove the "ret = " then we'd have to pull the arguments back
as well.  I think this fix that Julia suggested is really the right so
leave the indenting alone.

It looks like you've right aligned the arguments.  That's not the right
way, the original was correct.

regards,
dan carpenter

Re: [PATCH -next v3] drm/amdgpu: return 'ret' immediately if failed in amdgpu_pmu_init

[maowenan]

On 2019/6/24 16:39, Dan Carpenter wrote:
> On Mon, Jun 24, 2019 at 11:45:32AM +0800, Mao Wenan wrote:
>> There is one warning:
>> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
>> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
>>   int ret = 0;
>>       ^
>> amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
>> which will use the return value. So it should return 'ret' immediately if init_pmu_by_type() failed.
>> amdgpu_device_init()
>> 	r = amdgpu_pmu_init(adev);
>>
>> This patch is also to update the indenting on the arguments so they line up with the '('.
>>
>> Fixes: 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")
>>
>> Signed-off-by: Mao Wenan <maowenan@huawei.com>
>> ---
>>  v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
>>  amdgpu_pmu_init().
>>  v2->v3: change the subject for this patch; return 'ret' immediately if failed to call init_pmu_by_type(). 
>>
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 7 +++++--
>>  1 file changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>> index 0e6dba9..b702322 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>> @@ -252,8 +252,11 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
>>  	case CHIP_VEGA20:
>>  		/* init df */
>>  		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
>> -				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
>> -				       DF_V3_6_MAX_COUNTERS);
>> +							   "DF", "amdgpu_df",
>> +							   PERF_TYPE_AMDGPU_DF,
>> +							   DF_V3_6_MAX_COUNTERS);
>> +		if (ret)
>> +			return ret;
> 
> No no.  Sorry, the original indenting was correct and lined up with the
> '(' character in 'init_pmu_by_type(', that's the way it should be.  If
> we were to remove the "ret = " then we'd have to pull the arguments back
> as well.  I think this fix that Julia suggested is really the right so
> leave the indenting alone.
> 

> It looks like you've right aligned the arguments.  That's not the right
> way, the original was correct.
> 
After using 8 character for tab(thanks to Joe), the aligned here is wrong, yes, the original was correct.

so my v4 is only to change ret, don't change the indenting?

> regards,
> dan carpenter
> 
> 
> .
> 

Re: [PATCH -next v3] drm/amdgpu: return 'ret' immediately if failed in amdgpu_pmu_init

[Dan Carpenter]

On Mon, Jun 24, 2019 at 05:29:33PM +0800, maowenan wrote:
> 
> 
> On 2019/6/24 16:39, Dan Carpenter wrote:
> > On Mon, Jun 24, 2019 at 11:45:32AM +0800, Mao Wenan wrote:
> >> There is one warning:
> >> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
> >> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
> >>   int ret = 0;
> >>       ^
> >> amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
> >> which will use the return value. So it should return 'ret' immediately if init_pmu_by_type() failed.
> >> amdgpu_device_init()
> >> 	r = amdgpu_pmu_init(adev);
> >>
> >> This patch is also to update the indenting on the arguments so they line up with the '('.
> >>
> >> Fixes: 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")
> >>
> >> Signed-off-by: Mao Wenan <maowenan@huawei.com>
> >> ---
> >>  v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
> >>  amdgpu_pmu_init().
> >>  v2->v3: change the subject for this patch; return 'ret' immediately if failed to call init_pmu_by_type(). 
> >>
> >>  drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 7 +++++--
> >>  1 file changed, 5 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> >> index 0e6dba9..b702322 100644
> >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> >> @@ -252,8 +252,11 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
> >>  	case CHIP_VEGA20:
> >>  		/* init df */
> >>  		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
> >> -				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
> >> -				       DF_V3_6_MAX_COUNTERS);
> >> +							   "DF", "amdgpu_df",
> >> +							   PERF_TYPE_AMDGPU_DF,
> >> +							   DF_V3_6_MAX_COUNTERS);
> >> +		if (ret)
> >> +			return ret;
> > 
> > No no.  Sorry, the original indenting was correct and lined up with the
> > '(' character in 'init_pmu_by_type(', that's the way it should be.  If
> > we were to remove the "ret = " then we'd have to pull the arguments back
> > as well.  I think this fix that Julia suggested is really the right so
> > leave the indenting alone.
> > 
> 
> > It looks like you've right aligned the arguments.  That's not the right
> > way, the original was correct.
> > 
> After using 8 character for tab(thanks to Joe), the aligned here is wrong, yes, the original was correct.
> 
> so my v4 is only to change ret, don't change the indenting?
> 

Yes, please.  Sorry for my confusing email earlier.

regards,
dan carpenter

[PATCH -next v4] drm/amdgpu: return 'ret' immediately if failed in amdgpu_pmu_init

[Mao Wenan]

There is one warning:
drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
  int ret = 0;
      ^
amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
which will use the return value. So it should return 'ret' immediately if init_pmu_by_type() failed.
amdgpu_device_init()
	r = amdgpu_pmu_init(adev);

Fixes: 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")

Signed-off-by: Mao Wenan <maowenan@huawei.com>
---
 v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in
 amdgpu_pmu_init().
 v2->v3: change the subject for this patch; return 'ret' immediately if failed to call init_pmu_by_type(). 
 v3->v4: delete the indenting for init_pmu_by_type() arguments. The original indenting is correct.

 drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
index 0e6dba9f60f0..c98cf77a37f3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
@@ -254,6 +254,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
 		ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
 				       "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
 				       DF_V3_6_MAX_COUNTERS);
+		if (ret)
+			return ret;
 
 		/* other pmu types go here*/
 		break;
-- 
2.20.1

RE: [PATCH -next v4] drm/amdgpu: return 'ret' immediately if failed in amdgpu_pmu_init

[Kim, Jonathan]

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cmVhazsNCi0tDQoyLjIwLjENCg0K

Re: [PATCH -next v4] drm/amdgpu: return 'ret' immediately if failed in amdgpu_pmu_init

[maowenan]

On 2019/6/25 1:42, Kim, Jonathan wrote:
> Immediate return should be ok since perf registration isn't dependent on gpu hw.
> 
> Reviewed-by: Jonathan Kim <Jonathan.Kim@amd.com>

thanks for review.

> 
> -----Original Message-----
> From: Mao Wenan <maowenan@huawei.com> 
> Sent: Monday, June 24, 2019 7:23 AM
> To: airlied@linux.ie; daniel@ffwll.ch; Deucher, Alexander <Alexander.Deucher@amd.com>; Koenig, Christian <Christian.Koenig@amd.com>; Zhou, David(ChunMing) <David1.Zhou@amd.com>; dan.carpenter@oracle.com; julia.lawall@lip6.fr
> Cc: kernel-janitors@vger.kernel.org; amd-gfx@lists.freedesktop.org; linux-kernel@vger.kernel.org; Kim, Jonathan <Jonathan.Kim@amd.com>; Mao Wenan <maowenan@huawei.com>
> Subject: [PATCH -next v4] drm/amdgpu: return 'ret' immediately if failed in amdgpu_pmu_init
> 
> [CAUTION: External Email]
> 
> There is one warning:
> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
>   int ret = 0;
>       ^
> amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
> which will use the return value. So it should return 'ret' immediately if init_pmu_by_type() failed.
> amdgpu_device_init()
>         r = amdgpu_pmu_init(adev);
> 
> Fixes: 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")
> 
> Signed-off-by: Mao Wenan <maowenan@huawei.com>
> ---
>  v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in  amdgpu_pmu_init().
>  v2->v3: change the subject for this patch; return 'ret' immediately if failed to call init_pmu_by_type().
>  v3->v4: delete the indenting for init_pmu_by_type() arguments. The original indenting is correct.
> 
>  drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> index 0e6dba9f60f0..c98cf77a37f3 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
> @@ -254,6 +254,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
>                 ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
>                                        "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
>                                        DF_V3_6_MAX_COUNTERS);
> +               if (ret)
> +                       return ret;
> 
>                 /* other pmu types go here*/
>                 break;
> --
> 2.20.1
> 

Re: [PATCH -next v4] drm/amdgpu: return 'ret' immediately if failed in amdgpu_pmu_init

[maowenan]

gentle ping


On 2019/6/26 19:35, maowenan wrote:
> 
> 
> On 2019/6/25 1:42, Kim, Jonathan wrote:
>> Immediate return should be ok since perf registration isn't dependent on gpu hw.
>>
>> Reviewed-by: Jonathan Kim <Jonathan.Kim@amd.com>
> 
> thanks for review.
> 
>>
>> -----Original Message-----
>> From: Mao Wenan <maowenan@huawei.com> 
>> Sent: Monday, June 24, 2019 7:23 AM
>> To: airlied@linux.ie; daniel@ffwll.ch; Deucher, Alexander <Alexander.Deucher@amd.com>; Koenig, Christian <Christian.Koenig@amd.com>; Zhou, David(ChunMing) <David1.Zhou@amd.com>; dan.carpenter@oracle.com; julia.lawall@lip6.fr
>> Cc: kernel-janitors@vger.kernel.org; amd-gfx@lists.freedesktop.org; linux-kernel@vger.kernel.org; Kim, Jonathan <Jonathan.Kim@amd.com>; Mao Wenan <maowenan@huawei.com>
>> Subject: [PATCH -next v4] drm/amdgpu: return 'ret' immediately if failed in amdgpu_pmu_init
>>
>> [CAUTION: External Email]
>>
>> There is one warning:
>> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c: In function ‘amdgpu_pmu_init’:
>> drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c:249:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
>>   int ret = 0;
>>       ^
>> amdgpu_pmu_init() is called by amdgpu_device_init() in drivers/gpu/drm/amd/amdgpu/amdgpu_device.c,
>> which will use the return value. So it should return 'ret' immediately if init_pmu_by_type() failed.
>> amdgpu_device_init()
>>         r = amdgpu_pmu_init(adev);
>>
>> Fixes: 9c7c85f7ea1f ("drm/amdgpu: add pmu counters")
>>
>> Signed-off-by: Mao Wenan <maowenan@huawei.com>
>> ---
>>  v1->v2: change the subject for this patch; change the indenting when it calls init_pmu_by_type; use the value 'ret' in  amdgpu_pmu_init().
>>  v2->v3: change the subject for this patch; return 'ret' immediately if failed to call init_pmu_by_type().
>>  v3->v4: delete the indenting for init_pmu_by_type() arguments. The original indenting is correct.
>>
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>> index 0e6dba9f60f0..c98cf77a37f3 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c
>> @@ -254,6 +254,8 @@ int amdgpu_pmu_init(struct amdgpu_device *adev)
>>                 ret = init_pmu_by_type(adev, df_v3_6_attr_groups,
>>                                        "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF,
>>                                        DF_V3_6_MAX_COUNTERS);
>> +               if (ret)
>> +                       return ret;
>>
>>                 /* other pmu types go here*/
>>                 break;
>> --
>> 2.20.1
>>
> 
> 
> .
> 

[PATCH -next] drm/amdgpu: remove set but not used variable 'adev'

[YueHaibing]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c: In function 'amdgpu_init_mem_type':
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c:81:24: warning:
 variable 'adev' set but not used [-Wunused-but-set-variable]
  struct amdgpu_device *adev;
                        ^

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index bb95627ad2cc..8199702d3354 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -78,10 +78,6 @@
 static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 				struct ttm_mem_type_manager *man)
 {
-	struct amdgpu_device *adev;
-
-	adev = amdgpu_ttm_adev(bdev);
-
 	switch (type) {
 	case TTM_PL_SYSTEM:
 		/* System memory */

Re: [PATCH -next] drm/amdgpu: remove set but not used variable 'adev'

[Alex Deucher]

On Thu, Jul 2, 2020 at 3:25 AM YueHaibing <yuehaibing@huawei.com> wrote:
>
> Fixes gcc '-Wunused-but-set-variable' warning:
>
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c: In function 'amdgpu_init_mem_type':
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c:81:24: warning:
>  variable 'adev' set but not used [-Wunused-but-set-variable]
>   struct amdgpu_device *adev;
>                         ^
>
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>

With our current -next tree, this patch is no longer applicable.

Alex

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index bb95627ad2cc..8199702d3354 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -78,10 +78,6 @@
>  static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
>                                 struct ttm_mem_type_manager *man)
>  {
> -       struct amdgpu_device *adev;
> -
> -       adev = amdgpu_ttm_adev(bdev);
> -
>         switch (type) {
>         case TTM_PL_SYSTEM:
>                 /* System memory */
>
>
>
>
>
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