* [PATCH] drm/amd/amdgpu: enable W=1 for amdgpu
@ 2023-06-09 16:42 Hamza Mahfooz
2023-06-09 20:17 ` Nathan Chancellor
0 siblings, 1 reply; 4+ messages in thread
From: Hamza Mahfooz @ 2023-06-09 16:42 UTC (permalink / raw)
To: amd-gfx
Cc: Hamza Mahfooz, Alex Deucher, Nathan Chancellor,
Christian König, Pan, Xinhui, David Airlie, Daniel Vetter,
Hawking Zhang, Le Ma, Tao Zhou, YiPeng Chai, James Zhu,
Xiaojian Du, Lijo Lazar, dri-devel, linux-kernel
We have a clean build with W=1 as of
commit 12a15dd589ac ("drm/amd/display/amdgpu_dm/amdgpu_dm_helpers: Move
SYNAPTICS_DEVICE_ID into CONFIG_DRM_AMD_DC_DCN ifdef"). So, let's enable
these checks unconditionally for the entire module to catch these errors
during development.
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
---
drivers/gpu/drm/amd/amdgpu/Makefile | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index 86b833085f19..8d16f280b695 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -40,7 +40,18 @@ ccflags-y := -I$(FULL_AMD_PATH)/include/asic_reg \
-I$(FULL_AMD_PATH)/amdkfd
subdir-ccflags-y := -Wextra
-subdir-ccflags-y += $(call cc-option, -Wunused-but-set-variable)
+subdir-ccflags-y += -Wunused
+subdir-ccflags-y += -Wmissing-prototypes
+subdir-ccflags-y += -Wmissing-declarations
+subdir-ccflags-y += -Wmissing-include-dirs
+subdir-ccflags-y += -Wold-style-definition
+subdir-ccflags-y += -Wmissing-format-attribute
+# Need this to avoid recursive variable evaluation issues
+cond-flags := $(call cc-option, -Wunused-but-set-variable) \
+ $(call cc-option, -Wunused-const-variable) \
+ $(call cc-option, -Wstringop-truncation) \
+ $(call cc-option, -Wpacked-not-aligned)
+subdir-ccflags-y += $(cond-flags)
subdir-ccflags-y += -Wno-unused-parameter
subdir-ccflags-y += -Wno-type-limits
subdir-ccflags-y += -Wno-sign-compare
--
2.40.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/amd/amdgpu: enable W=1 for amdgpu
2023-06-09 16:42 [PATCH] drm/amd/amdgpu: enable W=1 for amdgpu Hamza Mahfooz
@ 2023-06-09 20:17 ` Nathan Chancellor
2023-06-10 1:20 ` Masahiro Yamada
0 siblings, 1 reply; 4+ messages in thread
From: Nathan Chancellor @ 2023-06-09 20:17 UTC (permalink / raw)
To: Hamza Mahfooz
Cc: amd-gfx, Alex Deucher, Christian König, Pan, Xinhui,
David Airlie, Daniel Vetter, Hawking Zhang, Le Ma, Tao Zhou,
YiPeng Chai, James Zhu, Xiaojian Du, Lijo Lazar, dri-devel,
linux-kernel, Masahiro Yamada, linux-kbuild
+ Masahiro and linux-kbuild
On Fri, Jun 09, 2023 at 12:42:06PM -0400, Hamza Mahfooz wrote:
> We have a clean build with W=1 as of
> commit 12a15dd589ac ("drm/amd/display/amdgpu_dm/amdgpu_dm_helpers: Move
> SYNAPTICS_DEVICE_ID into CONFIG_DRM_AMD_DC_DCN ifdef"). So, let's enable
> these checks unconditionally for the entire module to catch these errors
> during development.
>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Nathan Chancellor <nathan@kernel.org>
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
I think this is fine, especially since it will help catch issues in
amdgpu quickly and hopefully encourage developers to fix their problems
before they make it to a tree with wider impact lika -next.
However, this is now the third place that W=1 has been effectively
enabled (i915 and btrfs are the other two I know of) and it would be
nice if this was a little more unified, especially since it is not
uncommon for the warnings under W=1 to shift around and keeping them
unified will make maintainence over the longer term a little easier. I
am not sure if this has been brought up in the past and I don't want to
hold up this change but I suspect this sentiment of wanting to enable
W=1 on a per-subsystem basis is going to continue to grow.
Regardless, for clang 11.1.0 to 16.0.5, I see no warnings when building
drivers/gpu/drm/amd/amdgpu/ with Arch Linux's configuration or
allmodconfig.
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
> ---
> drivers/gpu/drm/amd/amdgpu/Makefile | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
> index 86b833085f19..8d16f280b695 100644
> --- a/drivers/gpu/drm/amd/amdgpu/Makefile
> +++ b/drivers/gpu/drm/amd/amdgpu/Makefile
> @@ -40,7 +40,18 @@ ccflags-y := -I$(FULL_AMD_PATH)/include/asic_reg \
> -I$(FULL_AMD_PATH)/amdkfd
>
> subdir-ccflags-y := -Wextra
> -subdir-ccflags-y += $(call cc-option, -Wunused-but-set-variable)
> +subdir-ccflags-y += -Wunused
> +subdir-ccflags-y += -Wmissing-prototypes
> +subdir-ccflags-y += -Wmissing-declarations
> +subdir-ccflags-y += -Wmissing-include-dirs
> +subdir-ccflags-y += -Wold-style-definition
> +subdir-ccflags-y += -Wmissing-format-attribute
> +# Need this to avoid recursive variable evaluation issues
> +cond-flags := $(call cc-option, -Wunused-but-set-variable) \
> + $(call cc-option, -Wunused-const-variable) \
> + $(call cc-option, -Wstringop-truncation) \
> + $(call cc-option, -Wpacked-not-aligned)
> +subdir-ccflags-y += $(cond-flags)
> subdir-ccflags-y += -Wno-unused-parameter
> subdir-ccflags-y += -Wno-type-limits
> subdir-ccflags-y += -Wno-sign-compare
> --
> 2.40.1
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/amd/amdgpu: enable W=1 for amdgpu
2023-06-09 20:17 ` Nathan Chancellor
@ 2023-06-10 1:20 ` Masahiro Yamada
2023-06-10 6:49 ` Jani Nikula
0 siblings, 1 reply; 4+ messages in thread
From: Masahiro Yamada @ 2023-06-10 1:20 UTC (permalink / raw)
To: Nathan Chancellor
Cc: Hamza Mahfooz, amd-gfx, Alex Deucher, Christian König,
Pan, Xinhui, David Airlie, Daniel Vetter, Hawking Zhang, Le Ma,
Tao Zhou, YiPeng Chai, James Zhu, Xiaojian Du, Lijo Lazar,
dri-devel, linux-kernel, linux-kbuild
On Sat, Jun 10, 2023 at 5:17 AM Nathan Chancellor <nathan@kernel.org> wrote:
>
> + Masahiro and linux-kbuild
>
> On Fri, Jun 09, 2023 at 12:42:06PM -0400, Hamza Mahfooz wrote:
> > We have a clean build with W=1 as of
> > commit 12a15dd589ac ("drm/amd/display/amdgpu_dm/amdgpu_dm_helpers: Move
> > SYNAPTICS_DEVICE_ID into CONFIG_DRM_AMD_DC_DCN ifdef"). So, let's enable
> > these checks unconditionally for the entire module to catch these errors
> > during development.
> >
> > Cc: Alex Deucher <alexander.deucher@amd.com>
> > Cc: Nathan Chancellor <nathan@kernel.org>
> > Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
>
> I think this is fine, especially since it will help catch issues in
> amdgpu quickly and hopefully encourage developers to fix their problems
> before they make it to a tree with wider impact lika -next.
>
> However, this is now the third place that W=1 has been effectively
> enabled (i915 and btrfs are the other two I know of) and it would be
> nice if this was a little more unified, especially since it is not
> uncommon for the warnings under W=1 to shift around and keeping them
> unified will make maintainence over the longer term a little easier. I
> am not sure if this has been brought up in the past and I don't want to
> hold up this change but I suspect this sentiment of wanting to enable
> W=1 on a per-subsystem basis is going to continue to grow.
I believe this patch is the right way because
we will be able to add a new warning option to
scripts/Makefile.extrawarn without fixing any code.
I remember somebody argued that drivers should be
able to do
subdir-ccflags-y += $(W1_FLAGS)
However, if a new flag, -Wfoo, emits warnings
for drivers/gpu/drm/{i915,amd},
you cannot add it to W=1 until fixing the code.
If many drivers start to do likewise,
W=1 warning will not be W=1 any more.
Another good thing for hard-coding warning options
is you can lift up a warning flag one by one.
Let's say you fixed the entire DRM subsystem so
it is -Wunused free now.
Then, you can move -Wunused to drivers/gpu/drm/Makefile,
while other warning options stay in drivers Makefiles.
>
> Regardless, for clang 11.1.0 to 16.0.5, I see no warnings when building
> drivers/gpu/drm/amd/amdgpu/ with Arch Linux's configuration or
> allmodconfig.
>
> Reviewed-by: Nathan Chancellor <nathan@kernel.org>
> Tested-by: Nathan Chancellor <nathan@kernel.org>
>
> > ---
> > drivers/gpu/drm/amd/amdgpu/Makefile | 13 ++++++++++++-
> > 1 file changed, 12 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
> > index 86b833085f19..8d16f280b695 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/Makefile
> > +++ b/drivers/gpu/drm/amd/amdgpu/Makefile
> > @@ -40,7 +40,18 @@ ccflags-y := -I$(FULL_AMD_PATH)/include/asic_reg \
> > -I$(FULL_AMD_PATH)/amdkfd
> >
> > subdir-ccflags-y := -Wextra
> > -subdir-ccflags-y += $(call cc-option, -Wunused-but-set-variable)
> > +subdir-ccflags-y += -Wunused
> > +subdir-ccflags-y += -Wmissing-prototypes
> > +subdir-ccflags-y += -Wmissing-declarations
> > +subdir-ccflags-y += -Wmissing-include-dirs
> > +subdir-ccflags-y += -Wold-style-definition
> > +subdir-ccflags-y += -Wmissing-format-attribute
> > +# Need this to avoid recursive variable evaluation issues
> > +cond-flags := $(call cc-option, -Wunused-but-set-variable) \
> > + $(call cc-option, -Wunused-const-variable) \
> > + $(call cc-option, -Wstringop-truncation) \
> > + $(call cc-option, -Wpacked-not-aligned)
> > +subdir-ccflags-y += $(cond-flags)
> > subdir-ccflags-y += -Wno-unused-parameter
> > subdir-ccflags-y += -Wno-type-limits
> > subdir-ccflags-y += -Wno-sign-compare
> > --
> > 2.40.1
> >
--
Best Regards
Masahiro Yamada
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/amd/amdgpu: enable W=1 for amdgpu
2023-06-10 1:20 ` Masahiro Yamada
@ 2023-06-10 6:49 ` Jani Nikula
0 siblings, 0 replies; 4+ messages in thread
From: Jani Nikula @ 2023-06-10 6:49 UTC (permalink / raw)
To: Masahiro Yamada, Nathan Chancellor
Cc: Tao Zhou, Xiaojian Du, linux-kbuild, dri-devel, Pan, Xinhui,
linux-kernel, amd-gfx, Lijo Lazar, Le Ma, YiPeng Chai,
Hamza Mahfooz, Alex Deucher, James Zhu, Christian König,
Hawking Zhang
On Sat, 10 Jun 2023, Masahiro Yamada <masahiroy@kernel.org> wrote:
> On Sat, Jun 10, 2023 at 5:17 AM Nathan Chancellor <nathan@kernel.org> wrote:
>>
>> + Masahiro and linux-kbuild
>>
>> On Fri, Jun 09, 2023 at 12:42:06PM -0400, Hamza Mahfooz wrote:
>> > We have a clean build with W=1 as of
>> > commit 12a15dd589ac ("drm/amd/display/amdgpu_dm/amdgpu_dm_helpers: Move
>> > SYNAPTICS_DEVICE_ID into CONFIG_DRM_AMD_DC_DCN ifdef"). So, let's enable
>> > these checks unconditionally for the entire module to catch these errors
>> > during development.
>> >
>> > Cc: Alex Deucher <alexander.deucher@amd.com>
>> > Cc: Nathan Chancellor <nathan@kernel.org>
>> > Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
>>
>> I think this is fine, especially since it will help catch issues in
>> amdgpu quickly and hopefully encourage developers to fix their problems
>> before they make it to a tree with wider impact lika -next.
>>
>> However, this is now the third place that W=1 has been effectively
>> enabled (i915 and btrfs are the other two I know of) and it would be
>> nice if this was a little more unified, especially since it is not
>> uncommon for the warnings under W=1 to shift around and keeping them
>> unified will make maintainence over the longer term a little easier. I
>> am not sure if this has been brought up in the past and I don't want to
>> hold up this change but I suspect this sentiment of wanting to enable
>> W=1 on a per-subsystem basis is going to continue to grow.
>
>
>
> I believe this patch is the right way because
> we will be able to add a new warning option to
> scripts/Makefile.extrawarn without fixing any code.
>
> I remember somebody argued that drivers should be
> able to do
> subdir-ccflags-y += $(W1_FLAGS)
Personally, I think this would be the viable way to make the kernel free
of W=1 warnings. Make it clean driver and subsystem at a time, with
constant progress. Currently, there's haphazard fixing of issues, with
new ones creeping back in, because kernel-wide W=1 is too verbose for
most developers. It's whac-a-mole.
> However, if a new flag, -Wfoo, emits warnings
> for drivers/gpu/drm/{i915,amd},
> you cannot add it to W=1 until fixing the code.
Or adding -Wno-foo where it breaks, until fixed.
> If many drivers start to do likewise,
> W=1 warning will not be W=1 any more.
I don't know, is the goal to fix the warnings, or keep adding stuff to
W=1 so that it'll always emit warnings? :p
BR,
Jani.
> Another good thing for hard-coding warning options
> is you can lift up a warning flag one by one.
>
>
> Let's say you fixed the entire DRM subsystem so
> it is -Wunused free now.
>
> Then, you can move -Wunused to drivers/gpu/drm/Makefile,
> while other warning options stay in drivers Makefiles.
>
>
>
>
>
>
>
>>
>> Regardless, for clang 11.1.0 to 16.0.5, I see no warnings when building
>> drivers/gpu/drm/amd/amdgpu/ with Arch Linux's configuration or
>> allmodconfig.
>>
>> Reviewed-by: Nathan Chancellor <nathan@kernel.org>
>> Tested-by: Nathan Chancellor <nathan@kernel.org>
>>
>> > ---
>> > drivers/gpu/drm/amd/amdgpu/Makefile | 13 ++++++++++++-
>> > 1 file changed, 12 insertions(+), 1 deletion(-)
>> >
>> > diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
>> > index 86b833085f19..8d16f280b695 100644
>> > --- a/drivers/gpu/drm/amd/amdgpu/Makefile
>> > +++ b/drivers/gpu/drm/amd/amdgpu/Makefile
>> > @@ -40,7 +40,18 @@ ccflags-y := -I$(FULL_AMD_PATH)/include/asic_reg \
>> > -I$(FULL_AMD_PATH)/amdkfd
>> >
>> > subdir-ccflags-y := -Wextra
>> > -subdir-ccflags-y += $(call cc-option, -Wunused-but-set-variable)
>> > +subdir-ccflags-y += -Wunused
>> > +subdir-ccflags-y += -Wmissing-prototypes
>> > +subdir-ccflags-y += -Wmissing-declarations
>> > +subdir-ccflags-y += -Wmissing-include-dirs
>> > +subdir-ccflags-y += -Wold-style-definition
>> > +subdir-ccflags-y += -Wmissing-format-attribute
>> > +# Need this to avoid recursive variable evaluation issues
>> > +cond-flags := $(call cc-option, -Wunused-but-set-variable) \
>> > + $(call cc-option, -Wunused-const-variable) \
>> > + $(call cc-option, -Wstringop-truncation) \
>> > + $(call cc-option, -Wpacked-not-aligned)
>> > +subdir-ccflags-y += $(cond-flags)
>> > subdir-ccflags-y += -Wno-unused-parameter
>> > subdir-ccflags-y += -Wno-type-limits
>> > subdir-ccflags-y += -Wno-sign-compare
>> > --
>> > 2.40.1
>> >
--
Jani Nikula, Intel Open Source Graphics Center
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-06-10 6:49 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2023-06-09 16:42 [PATCH] drm/amd/amdgpu: enable W=1 for amdgpu Hamza Mahfooz
2023-06-09 20:17 ` Nathan Chancellor
2023-06-10 1:20 ` Masahiro Yamada
2023-06-10 6:49 ` Jani Nikula
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