[PATCH] drm/amdgpu: suppress compile warnings

[Quan, Evan]

[AMD Official Use Only - General]



> -----Original Message-----
> From: Christian König <ckoenig.leichtzumerken at gmail.com>
> Sent: Monday, May 30, 2022 3:12 PM
> To: Quan, Evan <Evan.Quan at amd.com>; amd-gfx at lists.freedesktop.org
> Cc: Deucher, Alexander <Alexander.Deucher at amd.com>
> Subject: Re: [PATCH] drm/amdgpu: suppress compile warnings
> 
> Am 30.05.22 um 08:50 schrieb Evan Quan:
> > Suppress the compile warnings below:
> >
> >
> drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0_7_ppt.c:1
> 407:12: warning:
> > stack frame size (1040) exceeds limit (1024) in
> > 'smu_v13_0_7_get_power_profile_mode' [-Wframe-larger-than]
> > drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c:1986:6: warning:
> > no previous prototype for function 'gfx_v11_0_rlc_stop'
> > [-Wmissing-prototypes]
> >
> > Signed-off-by: Evan Quan <evan.quan at amd.com>
> > Change-Id: I679436c91cb98afb9fcbef8942fd90a17e5234b5
> > ---
> >   drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c               |  2 +-
> >   drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c | 12
> ++++++++++--
> >   2 files changed, 11 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
> > b/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
> > index 8c0a3fc7aaa6..cb581cfc7464 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
> > @@ -1983,7 +1983,7 @@ static int gfx_v11_0_init_csb(struct
> amdgpu_device *adev)
> >   	return 0;
> >   }
> >
> > -void gfx_v11_0_rlc_stop(struct amdgpu_device *adev)
> > +static void gfx_v11_0_rlc_stop(struct amdgpu_device *adev)
> >   {
> >   	u32 tmp = RREG32_SOC15(GC, 0, regRLC_CNTL);
> >
> > diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
> > b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
> > index 4e1861fb2c6a..8fd7652ae883 100644
> > --- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
> > +++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c
> > @@ -1406,7 +1406,7 @@ static int smu_v13_0_7_get_power_limit(struct
> > smu_context *smu,
> >
> >   static int smu_v13_0_7_get_power_profile_mode(struct smu_context
> *smu, char *buf)
> >   {
> > -	DpmActivityMonitorCoeffIntExternal_t
> activity_monitor_external[PP_SMC_POWER_PROFILE_COUNT];
> > +	DpmActivityMonitorCoeffIntExternal_t *activity_monitor_external;
> >   	uint32_t i, j, size = 0;
> >   	int16_t workload_type = 0;
> >   	int result = 0;
> > @@ -1414,6 +1414,11 @@ static int
> smu_v13_0_7_get_power_profile_mode(struct smu_context *smu, char
> *buf
> >   	if (!buf)
> >   		return -EINVAL;
> >
> > +	activity_monitor_external =
> kzalloc(sizeof(DpmActivityMonitorCoeffIntExternal_t) *
> PP_SMC_POWER_PROFILE_COUNT,
> > +					    GFP_KERNEL);
> 
> The static checkers will warn about that as well. Please use kcalloc(sizeof(...),
> count, GFP_KERNEL);
[Quan, Evan] I actually do not know that.. The warning is about the stack frame size (1040).
The space allocated by kzalloc/kmalloc is not on the stack. Per my knowledge, it should not have such limitation.
Did I miss something?

BR
Evan
> 
> Apart from that looks good to me.
> 
> Regards,
> Christian.
> 
> > +	if (!activity_monitor_external)
> > +		return -ENOMEM;
> > +
> >   	size += sysfs_emit_at(buf, size, "                              ");
> >   	for (i = 0; i <= PP_SMC_POWER_PROFILE_WINDOW3D; i++)
> >   		size += sysfs_emit_at(buf, size, "%-14s%s",
> > amdgpu_pp_profile_name[i], @@ -1426,14 +1431,17 @@ static int
> smu_v13_0_7_get_power_profile_mode(struct smu_context *smu, char
> *buf
> >   		workload_type = smu_cmn_to_asic_specific_index(smu,
> >
> CMN2ASIC_MAPPING_WORKLOAD,
> >   							       i);
> > -		if (workload_type < 0)
> > +		if (workload_type < 0) {
> > +			kfree(activity_monitor_external);
> >   			return -EINVAL;
> > +		}
> >
> >   		result = smu_cmn_update_table(smu,
> >
> SMU_TABLE_ACTIVITY_MONITOR_COEFF, workload_type,
> >   					  (void
> *)(&activity_monitor_external[i]), false);
> >   		if (result) {
> >   			dev_err(smu->adev->dev, "[%s] Failed to get activity
> monitor!",
> > __func__);
> > +			kfree(activity_monitor_external);
> >   			return result;
> >   		}
> >   	}