[PATCH 05/12] drm/amd/pm: remove dead code in navi10_emit_clk_levels and navi10_print_clk_levels
Zhang, Jesse(Jie)
Jesse.Zhang at amd.com
Tue Jun 4 03:51:33 UTC 2024
[AMD Official Use Only - AMD Internal Distribution Only]
Hi Kevin
I guess you didn't apply the patch correctly.
This patch doesn't remove default branch for clk_type.
In the case of SMU_OD_VDDC_CURVE in function navi10_emit_clk_levels ,
The variable i ranges from 0 -3, so the default branch in case SMU_OD_VDDC_CURVE cannot be executed.
static int navi10_emit_clk_levels(struct smu_context *smu,
enum smu_clk_type clk_type,
char *buf,
int *offset)
{
switch (clk_type) {
...
case SMU_OD_VDDC_CURVE:
if (!smu->od_enabled || !od_table || !od_settings)
return -EOPNOTSUPP;
if (!navi10_od_feature_is_supported(od_settings, SMU_11_0_ODCAP_GFXCLK_CURVE))
break;
*offset += sysfs_emit_at(buf, *offset, "OD_VDDC_CURVE:\n");
for (i = 0; i < 3; i++) {
switch (i) {
case 0:
curve_settings = &od_table->GfxclkFreq1;
break;
case 1:
curve_settings = &od_table->GfxclkFreq2;
break;
case 2:
curve_settings = &od_table->GfxclkFreq3;
break;
default: //don't need the default case.
break;
}
....
}
Thanks
Jesse
-----Original Message-----
From: Wang, Yang(Kevin) <KevinYang.Wang at amd.com>
Sent: Tuesday, June 4, 2024 10:39 AM
To: Zhang, Jesse(Jie) <Jesse.Zhang at amd.com>; amd-gfx at lists.freedesktop.org
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>; Kuehling, Felix <Felix.Kuehling at amd.com>; Huang, Tim <Tim.Huang at amd.com>
Subject: RE: [PATCH 05/12] drm/amd/pm: remove dead code in navi10_emit_clk_levels and navi10_print_clk_levels
[AMD Official Use Only - AMD Internal Distribution Only]
CC [M] drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.o
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c: In function 'navi10_emit_clk_levels':
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_VCLK1' not handled in switch [-Wswitch]
1275 | switch (clk_type) {
| ^~~~~~
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_DCLK1' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_ECLK' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_DISPCLK' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_PIXCLK' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_PHYCLK' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_LCLK' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_OD_CCLK' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_OD_VDDGFX_OFFSET' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_OD_FAN_CURVE' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_OD_ACOUSTIC_LIMIT' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_OD_ACOUSTIC_TARGET' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_OD_FAN_TARGET_TEMPERATURE' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_OD_FAN_MINIMUM_PWM' not handled in switch [-Wswitch]
/home/kevin/Work/disk/linux/linux-next/drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/navi10_ppt.c:1275:9: warning: enumeration value 'SMU_CLK_COUNT' not handled in switch [-Wswitch]
LD [M] drivers/gpu/drm/amd/amdgpu/amdgpu.o
After applied your patch , the kernel will show above compile warnings with 'W=1' flag.
# grep -nR -A 1 "default:" drivers | grep -i 'break' -B 1 And the above command will show all similar cases in kernel driver folder.
So, your patch is not necessary as my understanding.
Best Regards,
Kevin
-----Original Message-----
From: Zhang, Jesse(Jie) <Jesse.Zhang at amd.com>
Sent: Tuesday, June 4, 2024 9:23 AM
To: Wang, Yang(Kevin) <KevinYang.Wang at amd.com>; amd-gfx at lists.freedesktop.org
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>; Kuehling, Felix <Felix.Kuehling at amd.com>; Huang, Tim <Tim.Huang at amd.com>
Subject: RE: [PATCH 05/12] drm/amd/pm: remove dead code in navi10_emit_clk_levels and navi10_print_clk_levels
[AMD Official Use Only - AMD Internal Distribution Only]
Hi Kevin,
-----Original Message-----
From: Wang, Yang(Kevin) <KevinYang.Wang at amd.com>
Sent: Monday, June 3, 2024 5:09 PM
To: Zhang, Jesse(Jie) <Jesse.Zhang at amd.com>; amd-gfx at lists.freedesktop.org
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>; Kuehling, Felix <Felix.Kuehling at amd.com>; Huang, Tim <Tim.Huang at amd.com>; Zhang, Jesse(Jie) <Jesse.Zhang at amd.com>; Zhang, Jesse(Jie) <Jesse.Zhang at amd.com>
Subject: RE: [PATCH 05/12] drm/amd/pm: remove dead code in navi10_emit_clk_levels and navi10_print_clk_levels
[AMD Official Use Only - AMD Internal Distribution Only]
Could you share the problems you encountered?
Some compilers may prompt you to forget to handle default cases.
[Zhang, Jesse(Jie)] These warning scan by Coverity. These are useless redundant codes.
Thanks
Jesse
Best Regards,
Kevin
-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Jesse Zhang
Sent: Monday, June 3, 2024 4:48 PM
To: amd-gfx at lists.freedesktop.org
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>; Kuehling, Felix <Felix.Kuehling at amd.com>; Huang, Tim <Tim.Huang at amd.com>; Zhang, Jesse(Jie) <Jesse.Zhang at amd.com>; Zhang, Jesse(Jie) <Jesse.Zhang at amd.com>
Subject: [PATCH 05/12] drm/amd/pm: remove dead code in navi10_emit_clk_levels and navi10_print_clk_levels
Since the range of the varibable i is 0 - 3.
So execution cannot reach this statement: default.
Signed-off-by: Jesse Zhang <Jesse.Zhang at amd.com>
---
drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
index cf556f1b5ed1..076620fa3ef5 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
@@ -1389,8 +1389,6 @@ static int navi10_emit_clk_levels(struct smu_context *smu,
case 2:
curve_settings = &od_table->GfxclkFreq3;
break;
- default:
- break;
}
*offset += sysfs_emit_at(buf, *offset, "%d: %uMHz %umV\n",
i, curve_settings[0], @@ -1594,8 +1592,6 @@ static int navi10_print_clk_levels(struct smu_context *smu,
case 2:
curve_settings = &od_table->GfxclkFreq3;
break;
- default:
- break;
}
size += sysfs_emit_at(buf, size, "%d: %uMHz %umV\n",
i, curve_settings[0],
--
2.25.1
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