drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c:1812: possible pointless variable ?

drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c:1812: possible pointless variable ?

[David Binderman]

Hello there,

linux-4.7-rc5/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c:1812]:
(style) Variable 'stretch_amount2' is assigned a value that is never
used.

Source code is

    else if (stretch_amount == 3 || stretch_amount == 4)
        stretch_amount2 = 1;

Suggest either use the variable in some way, or delete it.

Regards

David Binderman

[PATCH] Remove unused variable

[Matthias Beyer]

Hi,

after reading your email, I created this patch.

**Please note all**: I'm getting into kernel dev right now (again), so I don't
even know how to test-compile this patch, let alone testing it.

You're more than welcome to teach me things.

Matthias Beyer (1):
  drivers: gpu: drm: amd: powerplay: hwmgr: Remove unused variable

 drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

-- 
2.9.0

[PATCH] drivers: gpu: drm: amd: powerplay: hwmgr: Remove unused variable

[Matthias Beyer]

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
index 64ee78f..1dcd52d 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
@@ -1761,7 +1761,7 @@ static int polaris10_populate_clock_stretcher_data_table(struct pp_hwmgr *hwmgr)
 {
 	uint32_t ro, efuse, volt_without_cks, volt_with_cks, value, max, min;
 	struct polaris10_hwmgr *data = (struct polaris10_hwmgr *)(hwmgr->backend);
-	uint8_t i, stretch_amount, stretch_amount2, volt_offset = 0;
+	uint8_t i, stretch_amount, volt_offset = 0;
 	struct phm_ppt_v1_information *table_info =
 			(struct phm_ppt_v1_information *)(hwmgr->pptable);
 	struct phm_ppt_v1_clock_voltage_dependency_table *sclk_table =
@@ -1806,11 +1806,8 @@ static int polaris10_populate_clock_stretcher_data_table(struct pp_hwmgr *hwmgr)
 	}
 
 	/* Populate CKS Lookup Table */
-	if (stretch_amount == 1 || stretch_amount == 2 || stretch_amount == 5)
-		stretch_amount2 = 0;
-	else if (stretch_amount == 3 || stretch_amount == 4)
-		stretch_amount2 = 1;
-	else {
+	if (stretch_amount != 1 && stretch_amount != 2 && stretch_amount != 3 &&
+			stretch_amount != 4 && stretch_amount != 5) {
 		phm_cap_unset(hwmgr->platform_descriptor.platformCaps,
 				PHM_PlatformCaps_ClockStretcher);
 		PP_ASSERT_WITH_CODE(false,
-- 
2.9.0

Re: [PATCH] drivers: gpu: drm: amd: powerplay: hwmgr: Remove unused variable

[Matthias Beyer]

[-- Attachment #1: Type: text/plain, Size: 2931 bytes --]

Hi list,

I just wondered: I send the patch >14 days ago, 9 days ago it was 
reviewed by Rex Zhu. As far as I know, it isn't applied by now. At 
least I did not get a mail indicating that it was applied.

Are there issues with the patch I missed?

On 05-07-2016 15:06:59, Zhu, Rex wrote:
> 
> Yes, stretch_amount2 was not used on Polaris.
> 
> 
> Patch was Reviewed-by: Rex Zhu <Rex.Zhu@amd.com>
> 
> 
> Thanks.
> 
> 
> Best Regards
> 
> Rex
> 
> ________________________________
> From: Matthias Beyer <mail@beyermatthias.de>
> Sent: Friday, July 1, 2016 12:38:49 AM
> To: linuxdev.baldrick@gmail.com
> Cc: Deucher, Alexander; Koenig, Christian; airlied@linux.ie; dri-devel@lists.freedesktop.org; dcb314@hotmail.com; linux-kernel@vger.kernel.org; Zhu, Rex; Huang, JinHuiEric; nils.wallmenius@gmail.com; Matthias Beyer
> Subject: [PATCH] drivers: gpu: drm: amd: powerplay: hwmgr: Remove unused variable
> 
> Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
> ---
>  drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
> index 64ee78f..1dcd52d 100644
> --- a/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
> +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
> @@ -1761,7 +1761,7 @@ static int polaris10_populate_clock_stretcher_data_table(struct pp_hwmgr *hwmgr)
>  {
>          uint32_t ro, efuse, volt_without_cks, volt_with_cks, value, max, min;
>          struct polaris10_hwmgr *data = (struct polaris10_hwmgr *)(hwmgr->backend);
> -       uint8_t i, stretch_amount, stretch_amount2, volt_offset = 0;
> +       uint8_t i, stretch_amount, volt_offset = 0;
>          struct phm_ppt_v1_information *table_info =
>                          (struct phm_ppt_v1_information *)(hwmgr->pptable);
>          struct phm_ppt_v1_clock_voltage_dependency_table *sclk_table =
> @@ -1806,11 +1806,8 @@ static int polaris10_populate_clock_stretcher_data_table(struct pp_hwmgr *hwmgr)
>          }
> 
>          /* Populate CKS Lookup Table */
> -       if (stretch_amount == 1 || stretch_amount == 2 || stretch_amount == 5)
> -               stretch_amount2 = 0;
> -       else if (stretch_amount == 3 || stretch_amount == 4)
> -               stretch_amount2 = 1;
> -       else {
> +       if (stretch_amount != 1 && stretch_amount != 2 && stretch_amount != 3 &&
> +                       stretch_amount != 4 && stretch_amount != 5) {
>                  phm_cap_unset(hwmgr->platform_descriptor.platformCaps,
>                                  PHM_PlatformCaps_ClockStretcher);
>                  PP_ASSERT_WITH_CODE(false,
> --
> 2.9.0
> 

-- 
Mit freundlichen Grüßen,
Kind regards,
Matthias Beyer

Proudly sent with mutt.
Happily signed with gnupg.

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 819 bytes --]

Re: [PATCH] drivers: gpu: drm: amd: powerplay: hwmgr: Remove unused variable

[Alex Deucher]

On Thu, Jul 14, 2016 at 1:22 PM, Matthias Beyer <mail@beyermatthias.de> wrote:
> Hi list,
>
> I just wondered: I send the patch >14 days ago, 9 days ago it was
> reviewed by Rex Zhu. As far as I know, it isn't applied by now. At
> least I did not get a mail indicating that it was applied.
>
> Are there issues with the patch I missed?

Applied.  Sorry for the delay.

Alex

>
> On 05-07-2016 15:06:59, Zhu, Rex wrote:
>>
>> Yes, stretch_amount2 was not used on Polaris.
>>
>>
>> Patch was Reviewed-by: Rex Zhu <Rex.Zhu@amd.com>
>>
>>
>> Thanks.
>>
>>
>> Best Regards
>>
>> Rex
>>
>> ________________________________
>> From: Matthias Beyer <mail@beyermatthias.de>
>> Sent: Friday, July 1, 2016 12:38:49 AM
>> To: linuxdev.baldrick@gmail.com
>> Cc: Deucher, Alexander; Koenig, Christian; airlied@linux.ie; dri-devel@lists.freedesktop.org; dcb314@hotmail.com; linux-kernel@vger.kernel.org; Zhu, Rex; Huang, JinHuiEric; nils.wallmenius@gmail.com; Matthias Beyer
>> Subject: [PATCH] drivers: gpu: drm: amd: powerplay: hwmgr: Remove unused variable
>>
>> Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
>> ---
>>  drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c | 9 +++------
>>  1 file changed, 3 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
>> index 64ee78f..1dcd52d 100644
>> --- a/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
>> +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
>> @@ -1761,7 +1761,7 @@ static int polaris10_populate_clock_stretcher_data_table(struct pp_hwmgr *hwmgr)
>>  {
>>          uint32_t ro, efuse, volt_without_cks, volt_with_cks, value, max, min;
>>          struct polaris10_hwmgr *data = (struct polaris10_hwmgr *)(hwmgr->backend);
>> -       uint8_t i, stretch_amount, stretch_amount2, volt_offset = 0;
>> +       uint8_t i, stretch_amount, volt_offset = 0;
>>          struct phm_ppt_v1_information *table_info =
>>                          (struct phm_ppt_v1_information *)(hwmgr->pptable);
>>          struct phm_ppt_v1_clock_voltage_dependency_table *sclk_table =
>> @@ -1806,11 +1806,8 @@ static int polaris10_populate_clock_stretcher_data_table(struct pp_hwmgr *hwmgr)
>>          }
>>
>>          /* Populate CKS Lookup Table */
>> -       if (stretch_amount == 1 || stretch_amount == 2 || stretch_amount == 5)
>> -               stretch_amount2 = 0;
>> -       else if (stretch_amount == 3 || stretch_amount == 4)
>> -               stretch_amount2 = 1;
>> -       else {
>> +       if (stretch_amount != 1 && stretch_amount != 2 && stretch_amount != 3 &&
>> +                       stretch_amount != 4 && stretch_amount != 5) {
>>                  phm_cap_unset(hwmgr->platform_descriptor.platformCaps,
>>                                  PHM_PlatformCaps_ClockStretcher);
>>                  PP_ASSERT_WITH_CODE(false,
>> --
>> 2.9.0
>>
>
> --
> Mit freundlichen Grüßen,
> Kind regards,
> Matthias Beyer
>
> Proudly sent with mutt.
> Happily signed with gnupg.
>
> _______________________________________________
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