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[-next,0/8] drm/amd/amdgpu: fix comparison pointer to bool warning

Message ID 20200909130720.105234-1-zhengbin13@huawei.com (mailing list archive)
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Series drm/amd/amdgpu: fix comparison pointer to bool warning | expand

Message

Zheng Bin Sept. 9, 2020, 1:07 p.m. UTC
Zheng Bin (8):
  drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v9_0.c
  drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v10_0.c
  drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_0.c
  drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_2.c
  drm/amd/amdgpu: fix comparison pointer to bool warning in si.c
  drm/amd/amdgpu: fix comparison pointer to bool warning in uvd_v6_0.c
  drm/amd/amdgpu: fix comparison pointer to bool warning in
    amdgpu_atpx_handler.c
  drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v4_0.c

 drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c | 4 ++--
 drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c           | 2 +-
 drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c            | 2 +-
 drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c           | 4 ++--
 drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c           | 2 +-
 drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c           | 2 +-
 drivers/gpu/drm/amd/amdgpu/si.c                  | 2 +-
 drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c            | 4 ++--
 8 files changed, 11 insertions(+), 11 deletions(-)

--
2.26.0.106.g9fadedd

Comments

Alex Deucher Sept. 15, 2020, 7:16 p.m. UTC | #1
I question the value of these warnings.  Why even have a boolean type
if you are going to get warnings when you use them...
That said, applied to avoid getting these patches again and again
every time someone sees this.

Alex

On Wed, Sep 9, 2020 at 9:21 AM Christian König <christian.koenig@amd.com> wrote:
>
> Acked-by: Christian König <christian.koenig@amd.com> for the series.
>
> Am 09.09.20 um 15:07 schrieb Zheng Bin:
> > Zheng Bin (8):
> >    drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v9_0.c
> >    drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v10_0.c
> >    drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_0.c
> >    drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_2.c
> >    drm/amd/amdgpu: fix comparison pointer to bool warning in si.c
> >    drm/amd/amdgpu: fix comparison pointer to bool warning in uvd_v6_0.c
> >    drm/amd/amdgpu: fix comparison pointer to bool warning in
> >      amdgpu_atpx_handler.c
> >    drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v4_0.c
> >
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c | 4 ++--
> >   drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c           | 2 +-
> >   drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c            | 2 +-
> >   drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c           | 4 ++--
> >   drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c           | 2 +-
> >   drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c           | 2 +-
> >   drivers/gpu/drm/amd/amdgpu/si.c                  | 2 +-
> >   drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c            | 4 ++--
> >   8 files changed, 11 insertions(+), 11 deletions(-)
> >
> > --
> > 2.26.0.106.g9fadedd
> >
>
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
Ville Syrjälä Sept. 15, 2020, 7:35 p.m. UTC | #2
On Tue, Sep 15, 2020 at 03:16:32PM -0400, Alex Deucher wrote:
> I question the value of these warnings.  Why even have a boolean type
> if you are going to get warnings when you use them...
> That said, applied to avoid getting these patches again and again
> every time someone sees this.

if (this_is_sparta)
if (this_is_sparta == true)
if (this_is_sparta != false)

I think the first one reads the best, and avoids having to
decide between truth and falsehood :)

> 
> Alex
> 
> On Wed, Sep 9, 2020 at 9:21 AM Christian König <christian.koenig@amd.com> wrote:
> >
> > Acked-by: Christian König <christian.koenig@amd.com> for the series.
> >
> > Am 09.09.20 um 15:07 schrieb Zheng Bin:
> > > Zheng Bin (8):
> > >    drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v9_0.c
> > >    drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v10_0.c
> > >    drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_0.c
> > >    drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_2.c
> > >    drm/amd/amdgpu: fix comparison pointer to bool warning in si.c
> > >    drm/amd/amdgpu: fix comparison pointer to bool warning in uvd_v6_0.c
> > >    drm/amd/amdgpu: fix comparison pointer to bool warning in
> > >      amdgpu_atpx_handler.c
> > >    drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v4_0.c
> > >
> > >   drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c | 4 ++--
> > >   drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c           | 2 +-
> > >   drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c            | 2 +-
> > >   drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c           | 4 ++--
> > >   drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c           | 2 +-
> > >   drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c           | 2 +-
> > >   drivers/gpu/drm/amd/amdgpu/si.c                  | 2 +-
> > >   drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c            | 4 ++--
> > >   8 files changed, 11 insertions(+), 11 deletions(-)
> > >
> > > --
> > > 2.26.0.106.g9fadedd
> > >
> >
> > _______________________________________________
> > amd-gfx mailing list
> > amd-gfx@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/amd-gfx
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Christian König Sept. 16, 2020, 7:38 a.m. UTC | #3
Am 15.09.20 um 21:35 schrieb Ville Syrjälä:
> On Tue, Sep 15, 2020 at 03:16:32PM -0400, Alex Deucher wrote:
>> I question the value of these warnings.  Why even have a boolean type
>> if you are going to get warnings when you use them...
>> That said, applied to avoid getting these patches again and again
>> every time someone sees this.
> if (this_is_sparta)
> if (this_is_sparta == true)
> if (this_is_sparta != false)
>
> I think the first one reads the best, and avoids having to
> decide between truth and falsehood :)

+1

Christian.

>
>> Alex
>>
>> On Wed, Sep 9, 2020 at 9:21 AM Christian König <christian.koenig@amd.com> wrote:
>>> Acked-by: Christian König <christian.koenig@amd.com> for the series.
>>>
>>> Am 09.09.20 um 15:07 schrieb Zheng Bin:
>>>> Zheng Bin (8):
>>>>     drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v9_0.c
>>>>     drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v10_0.c
>>>>     drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_0.c
>>>>     drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_2.c
>>>>     drm/amd/amdgpu: fix comparison pointer to bool warning in si.c
>>>>     drm/amd/amdgpu: fix comparison pointer to bool warning in uvd_v6_0.c
>>>>     drm/amd/amdgpu: fix comparison pointer to bool warning in
>>>>       amdgpu_atpx_handler.c
>>>>     drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v4_0.c
>>>>
>>>>    drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c | 4 ++--
>>>>    drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c           | 2 +-
>>>>    drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c            | 2 +-
>>>>    drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c           | 4 ++--
>>>>    drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c           | 2 +-
>>>>    drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c           | 2 +-
>>>>    drivers/gpu/drm/amd/amdgpu/si.c                  | 2 +-
>>>>    drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c            | 4 ++--
>>>>    8 files changed, 11 insertions(+), 11 deletions(-)
>>>>
>>>> --
>>>> 2.26.0.106.g9fadedd
>>>>
>>> _______________________________________________
>>> amd-gfx mailing list
>>> amd-gfx@lists.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Daniel Vetter Sept. 16, 2020, 7:51 a.m. UTC | #4
On Wed, Sep 16, 2020 at 09:38:34AM +0200, Christian König wrote:
> Am 15.09.20 um 21:35 schrieb Ville Syrjälä:
> > On Tue, Sep 15, 2020 at 03:16:32PM -0400, Alex Deucher wrote:
> > > I question the value of these warnings.  Why even have a boolean type
> > > if you are going to get warnings when you use them...
> > > That said, applied to avoid getting these patches again and again
> > > every time someone sees this.
> > if (this_is_sparta)
> > if (this_is_sparta == true)
> > if (this_is_sparta != false)
> > 
> > I think the first one reads the best, and avoids having to
> > decide between truth and falsehood :)
> 
> +1

+1, especially because we also have the inversion when using negative
errno codes for failures and 0 as success, which results in

	if (errno == 0) /* success case */

but
	if (bool == 0) /* failure case */

now creative people do sometimes

	if (!errno) /* success case */

which I think is horribly confusing. So imo for more easier telling apart
of these too I think consistently using the short form for booleans, and
consistently using the more explicit long form for errno checks is a Very
Good Pattern :-)

Cheers, Daniel

> 
> Christian.
> 
> > 
> > > Alex
> > > 
> > > On Wed, Sep 9, 2020 at 9:21 AM Christian König <christian.koenig@amd.com> wrote:
> > > > Acked-by: Christian König <christian.koenig@amd.com> for the series.
> > > > 
> > > > Am 09.09.20 um 15:07 schrieb Zheng Bin:
> > > > > Zheng Bin (8):
> > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v9_0.c
> > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v10_0.c
> > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_0.c
> > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_2.c
> > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in si.c
> > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in uvd_v6_0.c
> > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in
> > > > >       amdgpu_atpx_handler.c
> > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v4_0.c
> > > > > 
> > > > >    drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c | 4 ++--
> > > > >    drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c           | 2 +-
> > > > >    drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c            | 2 +-
> > > > >    drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c           | 4 ++--
> > > > >    drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c           | 2 +-
> > > > >    drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c           | 2 +-
> > > > >    drivers/gpu/drm/amd/amdgpu/si.c                  | 2 +-
> > > > >    drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c            | 4 ++--
> > > > >    8 files changed, 11 insertions(+), 11 deletions(-)
> > > > > 
> > > > > --
> > > > > 2.26.0.106.g9fadedd
> > > > > 
> > > > _______________________________________________
> > > > amd-gfx mailing list
> > > > amd-gfx@lists.freedesktop.org
> > > > https://lists.freedesktop.org/mailman/listinfo/amd-gfx
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel@lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Alex Deucher Sept. 16, 2020, 1:36 p.m. UTC | #5
On Wed, Sep 16, 2020 at 3:51 AM Daniel Vetter <daniel@ffwll.ch> wrote:
>
> On Wed, Sep 16, 2020 at 09:38:34AM +0200, Christian König wrote:
> > Am 15.09.20 um 21:35 schrieb Ville Syrjälä:
> > > On Tue, Sep 15, 2020 at 03:16:32PM -0400, Alex Deucher wrote:
> > > > I question the value of these warnings.  Why even have a boolean type
> > > > if you are going to get warnings when you use them...
> > > > That said, applied to avoid getting these patches again and again
> > > > every time someone sees this.
> > > if (this_is_sparta)
> > > if (this_is_sparta == true)
> > > if (this_is_sparta != false)
> > >
> > > I think the first one reads the best, and avoids having to
> > > decide between truth and falsehood :)
> >
> > +1
>
> +1, especially because we also have the inversion when using negative
> errno codes for failures and 0 as success, which results in
>
>         if (errno == 0) /* success case */
>
> but
>         if (bool == 0) /* failure case */
>
> now creative people do sometimes
>
>         if (!errno) /* success case */
>
> which I think is horribly confusing. So imo for more easier telling apart
> of these too I think consistently using the short form for booleans, and
> consistently using the more explicit long form for errno checks is a Very
> Good Pattern :-)

I don't disagree with your logic, but we regularly get patches to
convert errno checks to drop the direct comparison because that is the
"preferred kernel style".  Arguably, we should be explicit in all
cases as that avoids all confusion.  With that in mind, my original
point stands.  Why have a type when comparisons against valid settings
for that type produce errors?

Alex

>
> Cheers, Daniel
>
> >
> > Christian.
> >
> > >
> > > > Alex
> > > >
> > > > On Wed, Sep 9, 2020 at 9:21 AM Christian König <christian.koenig@amd.com> wrote:
> > > > > Acked-by: Christian König <christian.koenig@amd.com> for the series.
> > > > >
> > > > > Am 09.09.20 um 15:07 schrieb Zheng Bin:
> > > > > > Zheng Bin (8):
> > > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v9_0.c
> > > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v10_0.c
> > > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_0.c
> > > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_2.c
> > > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in si.c
> > > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in uvd_v6_0.c
> > > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in
> > > > > >       amdgpu_atpx_handler.c
> > > > > >     drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v4_0.c
> > > > > >
> > > > > >    drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c | 4 ++--
> > > > > >    drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c           | 2 +-
> > > > > >    drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c            | 2 +-
> > > > > >    drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c           | 4 ++--
> > > > > >    drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c           | 2 +-
> > > > > >    drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c           | 2 +-
> > > > > >    drivers/gpu/drm/amd/amdgpu/si.c                  | 2 +-
> > > > > >    drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c            | 4 ++--
> > > > > >    8 files changed, 11 insertions(+), 11 deletions(-)
> > > > > >
> > > > > > --
> > > > > > 2.26.0.106.g9fadedd
> > > > > >
> > > > > _______________________________________________
> > > > > amd-gfx mailing list
> > > > > amd-gfx@lists.freedesktop.org
> > > > > https://lists.freedesktop.org/mailman/listinfo/amd-gfx
> > > > _______________________________________________
> > > > dri-devel mailing list
> > > > dri-devel@lists.freedesktop.org
> > > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
Christian König Sept. 16, 2020, 2:02 p.m. UTC | #6
Am 16.09.20 um 15:36 schrieb Alex Deucher:
> On Wed, Sep 16, 2020 at 3:51 AM Daniel Vetter <daniel@ffwll.ch> wrote:
>> On Wed, Sep 16, 2020 at 09:38:34AM +0200, Christian König wrote:
>>> Am 15.09.20 um 21:35 schrieb Ville Syrjälä:
>>>> On Tue, Sep 15, 2020 at 03:16:32PM -0400, Alex Deucher wrote:
>>>>> I question the value of these warnings.  Why even have a boolean type
>>>>> if you are going to get warnings when you use them...
>>>>> That said, applied to avoid getting these patches again and again
>>>>> every time someone sees this.
>>>> if (this_is_sparta)
>>>> if (this_is_sparta == true)
>>>> if (this_is_sparta != false)
>>>>
>>>> I think the first one reads the best, and avoids having to
>>>> decide between truth and falsehood :)
>>> +1
>> +1, especially because we also have the inversion when using negative
>> errno codes for failures and 0 as success, which results in
>>
>>          if (errno == 0) /* success case */
>>
>> but
>>          if (bool == 0) /* failure case */
>>
>> now creative people do sometimes
>>
>>          if (!errno) /* success case */
>>
>> which I think is horribly confusing. So imo for more easier telling apart
>> of these too I think consistently using the short form for booleans, and
>> consistently using the more explicit long form for errno checks is a Very
>> Good Pattern :-)
> I don't disagree with your logic, but we regularly get patches to
> convert errno checks to drop the direct comparison because that is the
> "preferred kernel style".  Arguably, we should be explicit in all
> cases as that avoids all confusion.  With that in mind, my original
> point stands.  Why have a type when comparisons against valid settings
> for that type produce errors?

Well it isn't an error, but raising a nice warning is most likely a good 
idea.

Christian.

>
> Alex
>
>> Cheers, Daniel
>>
>>> Christian.
>>>
>>>>> Alex
>>>>>
>>>>> On Wed, Sep 9, 2020 at 9:21 AM Christian König <christian.koenig@amd.com> wrote:
>>>>>> Acked-by: Christian König <christian.koenig@amd.com> for the series.
>>>>>>
>>>>>> Am 09.09.20 um 15:07 schrieb Zheng Bin:
>>>>>>> Zheng Bin (8):
>>>>>>>      drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v9_0.c
>>>>>>>      drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v10_0.c
>>>>>>>      drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_0.c
>>>>>>>      drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_2.c
>>>>>>>      drm/amd/amdgpu: fix comparison pointer to bool warning in si.c
>>>>>>>      drm/amd/amdgpu: fix comparison pointer to bool warning in uvd_v6_0.c
>>>>>>>      drm/amd/amdgpu: fix comparison pointer to bool warning in
>>>>>>>        amdgpu_atpx_handler.c
>>>>>>>      drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v4_0.c
>>>>>>>
>>>>>>>     drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c | 4 ++--
>>>>>>>     drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c           | 2 +-
>>>>>>>     drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c            | 2 +-
>>>>>>>     drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c           | 4 ++--
>>>>>>>     drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c           | 2 +-
>>>>>>>     drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c           | 2 +-
>>>>>>>     drivers/gpu/drm/amd/amdgpu/si.c                  | 2 +-
>>>>>>>     drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c            | 4 ++--
>>>>>>>     8 files changed, 11 insertions(+), 11 deletions(-)
>>>>>>>
>>>>>>> --
>>>>>>> 2.26.0.106.g9fadedd
>>>>>>>
>>>>>> _______________________________________________
>>>>>> amd-gfx mailing list
>>>>>> amd-gfx@lists.freedesktop.org
>>>>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&amp;data=02%7C01%7Cchristian.koenig%40amd.com%7Cdc7a8d7517d341e3a80c08d85a458ba8%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637358602051676053&amp;sdata=MS0vcBcU7unXjEFlbd8kLbJkJ4sKcvIdLjc8yhX4UUI%3D&amp;reserved=0
>>>>> _______________________________________________
>>>>> dri-devel mailing list
>>>>> dri-devel@lists.freedesktop.org
>>>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Fdri-devel&amp;data=02%7C01%7Cchristian.koenig%40amd.com%7Cdc7a8d7517d341e3a80c08d85a458ba8%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637358602051686051&amp;sdata=MgfR%2BwCVY9gWfhQ9i5kWcKiiYkV1C8O2dEKlZYSqscE%3D&amp;reserved=0
>>> _______________________________________________
>>> dri-devel mailing list
>>> dri-devel@lists.freedesktop.org
>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Fdri-devel&amp;data=02%7C01%7Cchristian.koenig%40amd.com%7Cdc7a8d7517d341e3a80c08d85a458ba8%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637358602051686051&amp;sdata=MgfR%2BwCVY9gWfhQ9i5kWcKiiYkV1C8O2dEKlZYSqscE%3D&amp;reserved=0
>> --
>> Daniel Vetter
>> Software Engineer, Intel Corporation
>> https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fblog.ffwll.ch%2F&amp;data=02%7C01%7Cchristian.koenig%40amd.com%7Cdc7a8d7517d341e3a80c08d85a458ba8%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637358602051686051&amp;sdata=GvLs5OXw2Ny%2BieJxm8hjawNb0rGA966539iAwlWwPMY%3D&amp;reserved=0
Daniel Vetter Sept. 16, 2020, 3:31 p.m. UTC | #7
On Wed, Sep 16, 2020 at 04:02:18PM +0200, Christian König wrote:
> Am 16.09.20 um 15:36 schrieb Alex Deucher:
> > On Wed, Sep 16, 2020 at 3:51 AM Daniel Vetter <daniel@ffwll.ch> wrote:
> > > On Wed, Sep 16, 2020 at 09:38:34AM +0200, Christian König wrote:
> > > > Am 15.09.20 um 21:35 schrieb Ville Syrjälä:
> > > > > On Tue, Sep 15, 2020 at 03:16:32PM -0400, Alex Deucher wrote:
> > > > > > I question the value of these warnings.  Why even have a boolean type
> > > > > > if you are going to get warnings when you use them...
> > > > > > That said, applied to avoid getting these patches again and again
> > > > > > every time someone sees this.
> > > > > if (this_is_sparta)
> > > > > if (this_is_sparta == true)
> > > > > if (this_is_sparta != false)
> > > > > 
> > > > > I think the first one reads the best, and avoids having to
> > > > > decide between truth and falsehood :)
> > > > +1
> > > +1, especially because we also have the inversion when using negative
> > > errno codes for failures and 0 as success, which results in
> > > 
> > >          if (errno == 0) /* success case */
> > > 
> > > but
> > >          if (bool == 0) /* failure case */
> > > 
> > > now creative people do sometimes
> > > 
> > >          if (!errno) /* success case */
> > > 
> > > which I think is horribly confusing. So imo for more easier telling apart
> > > of these too I think consistently using the short form for booleans, and
> > > consistently using the more explicit long form for errno checks is a Very
> > > Good Pattern :-)
> > I don't disagree with your logic, but we regularly get patches to
> > convert errno checks to drop the direct comparison because that is the
> > "preferred kernel style".  Arguably, we should be explicit in all
> > cases as that avoids all confusion.  With that in mind, my original
> > point stands.  Why have a type when comparisons against valid settings
> > for that type produce errors?

Oh, I didn't know that this happens for errno too.

I withdraw my +1 and concur this is a bikeshed. I guess still applying to
shut up the patch stream is the most reasonable thing :-/
-Daniel

> Well it isn't an error, but raising a nice warning is most likely a good
> idea.

> 
> Christian.
> 
> > 
> > Alex
> > 
> > > Cheers, Daniel
> > > 
> > > > Christian.
> > > > 
> > > > > > Alex
> > > > > > 
> > > > > > On Wed, Sep 9, 2020 at 9:21 AM Christian König <christian.koenig@amd.com> wrote:
> > > > > > > Acked-by: Christian König <christian.koenig@amd.com> for the series.
> > > > > > > 
> > > > > > > Am 09.09.20 um 15:07 schrieb Zheng Bin:
> > > > > > > > Zheng Bin (8):
> > > > > > > >      drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v9_0.c
> > > > > > > >      drm/amd/amdgpu: fix comparison pointer to bool warning in gfx_v10_0.c
> > > > > > > >      drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_0.c
> > > > > > > >      drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v5_2.c
> > > > > > > >      drm/amd/amdgpu: fix comparison pointer to bool warning in si.c
> > > > > > > >      drm/amd/amdgpu: fix comparison pointer to bool warning in uvd_v6_0.c
> > > > > > > >      drm/amd/amdgpu: fix comparison pointer to bool warning in
> > > > > > > >        amdgpu_atpx_handler.c
> > > > > > > >      drm/amd/amdgpu: fix comparison pointer to bool warning in sdma_v4_0.c
> > > > > > > > 
> > > > > > > >     drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c | 4 ++--
> > > > > > > >     drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c           | 2 +-
> > > > > > > >     drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c            | 2 +-
> > > > > > > >     drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c           | 4 ++--
> > > > > > > >     drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c           | 2 +-
> > > > > > > >     drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c           | 2 +-
> > > > > > > >     drivers/gpu/drm/amd/amdgpu/si.c                  | 2 +-
> > > > > > > >     drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c            | 4 ++--
> > > > > > > >     8 files changed, 11 insertions(+), 11 deletions(-)
> > > > > > > > 
> > > > > > > > --
> > > > > > > > 2.26.0.106.g9fadedd
> > > > > > > > 
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> > > --
> > > Daniel Vetter
> > > Software Engineer, Intel Corporation
> > > https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fblog.ffwll.ch%2F&amp;data=02%7C01%7Cchristian.koenig%40amd.com%7Cdc7a8d7517d341e3a80c08d85a458ba8%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637358602051686051&amp;sdata=GvLs5OXw2Ny%2BieJxm8hjawNb0rGA966539iAwlWwPMY%3D&amp;reserved=0
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