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[01/12] kbuild: make -Woverride-init warnings more consistent

Message ID 20240326144741.3094687-2-arnd@kernel.org (mailing list archive)
State Handled Elsewhere
Delegated to: BPF
Headers show
Series kbuild: enable some -Wextra warnings by default | expand

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Commit Message

Arnd Bergmann March 26, 2024, 2:47 p.m. UTC 
From: Arnd Bergmann <arnd@arndb.de>

The -Woverride-init warn about code that may be intentional or not,
but the inintentional ones tend to be real bugs, so there is a bit of
disagreement on whether this warning option should be enabled by default
and we have multiple settings in scripts/Makefile.extrawarn as well as
individual subsystems.

Older versions of clang only supported -Wno-initializer-overrides with
the same meaning as gcc's -Woverride-init, though all supported versions
now work with both. Because of this difference, an earlier cleanup of
mine accidentally turned the clang warning off for W=1 builds and only
left it on for W=2, while it's still enabled for gcc with W=1.

There is also one driver that only turns the warning off for newer
versions of gcc but not other compilers, and some but not all the
Makefiles still use a cc-disable-warning conditional that is no
longer needed with supported compilers here.

Address all of the above by removing the special cases for clang
and always turning the warning off unconditionally where it got
in the way, using the syntax that is supported by both compilers.

Fixes: 2cd3271b7a31 ("kbuild: avoid duplicate warning options")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/gpu/drm/amd/display/dc/dce110/Makefile |  2 +-
 drivers/gpu/drm/amd/display/dc/dce112/Makefile |  2 +-
 drivers/gpu/drm/amd/display/dc/dce120/Makefile |  2 +-
 drivers/gpu/drm/amd/display/dc/dce60/Makefile  |  2 +-
 drivers/gpu/drm/amd/display/dc/dce80/Makefile  |  2 +-
 drivers/gpu/drm/i915/Makefile                  |  6 +++---
 drivers/gpu/drm/xe/Makefile                    |  4 ++--
 drivers/net/ethernet/renesas/sh_eth.c          |  2 +-
 drivers/pinctrl/aspeed/Makefile                |  2 +-
 fs/proc/Makefile                               |  2 +-
 kernel/bpf/Makefile                            |  2 +-
 mm/Makefile                                    |  3 +--
 scripts/Makefile.extrawarn                     | 10 +++-------
 13 files changed, 18 insertions(+), 23 deletions(-)

Comments

Hamza Mahfooz March 26, 2024, 4:04 p.m. UTC | #1 
Cc: amd-gfx@lists.freedesktop.org

On 3/26/24 10:47, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The -Woverride-init warn about code that may be intentional or not,
> but the inintentional ones tend to be real bugs, so there is a bit of
> disagreement on whether this warning option should be enabled by default
> and we have multiple settings in scripts/Makefile.extrawarn as well as
> individual subsystems.
> 
> Older versions of clang only supported -Wno-initializer-overrides with
> the same meaning as gcc's -Woverride-init, though all supported versions
> now work with both. Because of this difference, an earlier cleanup of
> mine accidentally turned the clang warning off for W=1 builds and only
> left it on for W=2, while it's still enabled for gcc with W=1.
> 
> There is also one driver that only turns the warning off for newer
> versions of gcc but not other compilers, and some but not all the
> Makefiles still use a cc-disable-warning conditional that is no
> longer needed with supported compilers here.
> 
> Address all of the above by removing the special cases for clang
> and always turning the warning off unconditionally where it got
> in the way, using the syntax that is supported by both compilers.
> 
> Fixes: 2cd3271b7a31 ("kbuild: avoid duplicate warning options")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>

For the amdgpu changes.

> ---
>   drivers/gpu/drm/amd/display/dc/dce110/Makefile |  2 +-
>   drivers/gpu/drm/amd/display/dc/dce112/Makefile |  2 +-
>   drivers/gpu/drm/amd/display/dc/dce120/Makefile |  2 +-
>   drivers/gpu/drm/amd/display/dc/dce60/Makefile  |  2 +-
>   drivers/gpu/drm/amd/display/dc/dce80/Makefile  |  2 +-
>   drivers/gpu/drm/i915/Makefile                  |  6 +++---
>   drivers/gpu/drm/xe/Makefile                    |  4 ++--
>   drivers/net/ethernet/renesas/sh_eth.c          |  2 +-
>   drivers/pinctrl/aspeed/Makefile                |  2 +-
>   fs/proc/Makefile                               |  2 +-
>   kernel/bpf/Makefile                            |  2 +-
>   mm/Makefile                                    |  3 +--
>   scripts/Makefile.extrawarn                     | 10 +++-------
>   13 files changed, 18 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/dce110/Makefile b/drivers/gpu/drm/amd/display/dc/dce110/Makefile
> index f0777d61c2cb..c307f040e48f 100644
> --- a/drivers/gpu/drm/amd/display/dc/dce110/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dce110/Makefile
> @@ -23,7 +23,7 @@
>   # Makefile for the 'controller' sub-component of DAL.
>   # It provides the control and status of HW CRTC block.
>   
> -CFLAGS_$(AMDDALPATH)/dc/dce110/dce110_resource.o = $(call cc-disable-warning, override-init)
> +CFLAGS_$(AMDDALPATH)/dc/dce110/dce110_resource.o = -Wno-override-init
>   
>   DCE110 = dce110_timing_generator.o \
>   dce110_compressor.o dce110_opp_regamma_v.o \
> diff --git a/drivers/gpu/drm/amd/display/dc/dce112/Makefile b/drivers/gpu/drm/amd/display/dc/dce112/Makefile
> index 7e92effec894..683866797709 100644
> --- a/drivers/gpu/drm/amd/display/dc/dce112/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dce112/Makefile
> @@ -23,7 +23,7 @@
>   # Makefile for the 'controller' sub-component of DAL.
>   # It provides the control and status of HW CRTC block.
>   
> -CFLAGS_$(AMDDALPATH)/dc/dce112/dce112_resource.o = $(call cc-disable-warning, override-init)
> +CFLAGS_$(AMDDALPATH)/dc/dce112/dce112_resource.o = -Wno-override-init
>   
>   DCE112 = dce112_compressor.o
>   
> diff --git a/drivers/gpu/drm/amd/display/dc/dce120/Makefile b/drivers/gpu/drm/amd/display/dc/dce120/Makefile
> index 1e3ef68a452a..8f508e662748 100644
> --- a/drivers/gpu/drm/amd/display/dc/dce120/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dce120/Makefile
> @@ -24,7 +24,7 @@
>   # It provides the control and status of HW CRTC block.
>   
>   
> -CFLAGS_$(AMDDALPATH)/dc/dce120/dce120_resource.o = $(call cc-disable-warning, override-init)
> +CFLAGS_$(AMDDALPATH)/dc/dce120/dce120_resource.o = -Wno-override-init
>   
>   DCE120 = dce120_timing_generator.o
>   
> diff --git a/drivers/gpu/drm/amd/display/dc/dce60/Makefile b/drivers/gpu/drm/amd/display/dc/dce60/Makefile
> index fee331accc0e..eede83ad91fa 100644
> --- a/drivers/gpu/drm/amd/display/dc/dce60/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dce60/Makefile
> @@ -23,7 +23,7 @@
>   # Makefile for the 'controller' sub-component of DAL.
>   # It provides the control and status of HW CRTC block.
>   
> -CFLAGS_$(AMDDALPATH)/dc/dce60/dce60_resource.o = $(call cc-disable-warning, override-init)
> +CFLAGS_$(AMDDALPATH)/dc/dce60/dce60_resource.o = -Wno-override-init
>   
>   DCE60 = dce60_timing_generator.o dce60_hw_sequencer.o \
>   	dce60_resource.o
> diff --git a/drivers/gpu/drm/amd/display/dc/dce80/Makefile b/drivers/gpu/drm/amd/display/dc/dce80/Makefile
> index 7eefffbdc925..fba189d26652 100644
> --- a/drivers/gpu/drm/amd/display/dc/dce80/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/dce80/Makefile
> @@ -23,7 +23,7 @@
>   # Makefile for the 'controller' sub-component of DAL.
>   # It provides the control and status of HW CRTC block.
>   
> -CFLAGS_$(AMDDALPATH)/dc/dce80/dce80_resource.o = $(call cc-disable-warning, override-init)
> +CFLAGS_$(AMDDALPATH)/dc/dce80/dce80_resource.o = -Wno-override-init
>   
>   DCE80 = dce80_timing_generator.o
>   
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 3ef6ed41e62b..4c2f85632391 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -33,9 +33,9 @@ endif
>   subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror
>   
>   # Fine grained warnings disable
> -CFLAGS_i915_pci.o = $(call cc-disable-warning, override-init)
> -CFLAGS_display/intel_display_device.o = $(call cc-disable-warning, override-init)
> -CFLAGS_display/intel_fbdev.o = $(call cc-disable-warning, override-init)
> +CFLAGS_i915_pci.o = -Wno-override-init
> +CFLAGS_display/intel_display_device.o = -Wno-override-init
> +CFLAGS_display/intel_fbdev.o = -Wno-override-init
>   
>   # Support compiling the display code separately for both i915 and xe
>   # drivers. Define I915 when building i915.
> diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
> index 5a428ca00f10..c29a850859ad 100644
> --- a/drivers/gpu/drm/xe/Makefile
> +++ b/drivers/gpu/drm/xe/Makefile
> @@ -172,8 +172,8 @@ subdir-ccflags-$(CONFIG_DRM_XE_DISPLAY) += \
>   	-Ddrm_i915_gem_object=xe_bo \
>   	-Ddrm_i915_private=xe_device
>   
> -CFLAGS_i915-display/intel_fbdev.o = $(call cc-disable-warning, override-init)
> -CFLAGS_i915-display/intel_display_device.o = $(call cc-disable-warning, override-init)
> +CFLAGS_i915-display/intel_fbdev.o = -Wno-override-init
> +CFLAGS_i915-display/intel_display_device.o = -Wno-override-init
>   
>   # Rule to build SOC code shared with i915
>   $(obj)/i915-soc/%.o: $(srctree)/drivers/gpu/drm/i915/soc/%.c FORCE
> diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
> index 475e1e8c1d35..0786eb0da391 100644
> --- a/drivers/net/ethernet/renesas/sh_eth.c
> +++ b/drivers/net/ethernet/renesas/sh_eth.c
> @@ -50,7 +50,7 @@
>    * the macros available to do this only define GCC 8.
>    */
>   __diag_push();
> -__diag_ignore(GCC, 8, "-Woverride-init",
> +__diag_ignore_all("-Woverride-init",
>   	      "logic to initialize all and then override some is OK");
>   static const u16 sh_eth_offset_gigabit[SH_ETH_MAX_REGISTER_OFFSET] = {
>   	SH_ETH_OFFSET_DEFAULTS,
> diff --git a/drivers/pinctrl/aspeed/Makefile b/drivers/pinctrl/aspeed/Makefile
> index 489ea1778353..db2a7600ae2b 100644
> --- a/drivers/pinctrl/aspeed/Makefile
> +++ b/drivers/pinctrl/aspeed/Makefile
> @@ -1,7 +1,7 @@
>   # SPDX-License-Identifier: GPL-2.0-only
>   # Aspeed pinctrl support
>   
> -ccflags-y += $(call cc-option,-Woverride-init)
> +ccflags-y += -Woverride-init
>   obj-$(CONFIG_PINCTRL_ASPEED)	+= pinctrl-aspeed.o pinmux-aspeed.o
>   obj-$(CONFIG_PINCTRL_ASPEED_G4)	+= pinctrl-aspeed-g4.o
>   obj-$(CONFIG_PINCTRL_ASPEED_G5)	+= pinctrl-aspeed-g5.o
> diff --git a/fs/proc/Makefile b/fs/proc/Makefile
> index bd08616ed8ba..7b4db9c56e6a 100644
> --- a/fs/proc/Makefile
> +++ b/fs/proc/Makefile
> @@ -5,7 +5,7 @@
>   
>   obj-y   += proc.o
>   
> -CFLAGS_task_mmu.o	+= $(call cc-option,-Wno-override-init,)
> +CFLAGS_task_mmu.o	+= -Wno-override-init
>   proc-y			:= nommu.o task_nommu.o
>   proc-$(CONFIG_MMU)	:= task_mmu.o
>   
> diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile
> index 368c5d86b5b7..e497011261b8 100644
> --- a/kernel/bpf/Makefile
> +++ b/kernel/bpf/Makefile
> @@ -4,7 +4,7 @@ ifneq ($(CONFIG_BPF_JIT_ALWAYS_ON),y)
>   # ___bpf_prog_run() needs GCSE disabled on x86; see 3193c0836f203 for details
>   cflags-nogcse-$(CONFIG_X86)$(CONFIG_CC_IS_GCC) := -fno-gcse
>   endif
> -CFLAGS_core.o += $(call cc-disable-warning, override-init) $(cflags-nogcse-yy)
> +CFLAGS_core.o += -Wno-override-init $(cflags-nogcse-yy)
>   
>   obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o tnum.o log.o token.o
>   obj-$(CONFIG_BPF_SYSCALL) += bpf_iter.o map_iter.o task_iter.o prog_iter.o link_iter.o
> diff --git a/mm/Makefile b/mm/Makefile
> index e4b5b75aaec9..4abb40b911ec 100644
> --- a/mm/Makefile
> +++ b/mm/Makefile
> @@ -29,8 +29,7 @@ KCOV_INSTRUMENT_mmzone.o := n
>   KCOV_INSTRUMENT_vmstat.o := n
>   KCOV_INSTRUMENT_failslab.o := n
>   
> -CFLAGS_init-mm.o += $(call cc-disable-warning, override-init)
> -CFLAGS_init-mm.o += $(call cc-disable-warning, initializer-overrides)
> +CFLAGS_init-mm.o += -Wno-override-init
>   
>   mmu-y			:= nommu.o
>   mmu-$(CONFIG_MMU)	:= highmem.o memory.o mincore.o \
> diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
> index 3ce5d503a6da..c5af566e911a 100644
> --- a/scripts/Makefile.extrawarn
> +++ b/scripts/Makefile.extrawarn
> @@ -114,6 +114,8 @@ KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
>   KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
>   KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
>   
> +KBUILD_CFLAGS += -Wno-override-init # alias for -Wno-initializer-overrides in clang
> +
>   ifdef CONFIG_CC_IS_CLANG
>   # Clang before clang-16 would warn on default argument promotions.
>   ifneq ($(call clang-min-version, 160000),y)
> @@ -151,10 +153,6 @@ KBUILD_CFLAGS += -Wtype-limits
>   KBUILD_CFLAGS += $(call cc-option, -Wmaybe-uninitialized)
>   KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
>   
> -ifdef CONFIG_CC_IS_CLANG
> -KBUILD_CFLAGS += -Winitializer-overrides
> -endif
> -
>   KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2
>   
>   else
> @@ -164,9 +162,7 @@ KBUILD_CFLAGS += -Wno-missing-field-initializers
>   KBUILD_CFLAGS += -Wno-type-limits
>   KBUILD_CFLAGS += -Wno-shift-negative-value
>   
> -ifdef CONFIG_CC_IS_CLANG
> -KBUILD_CFLAGS += -Wno-initializer-overrides
> -else
> +ifdef CONFIG_CC_IS_GCC
>   KBUILD_CFLAGS += -Wno-maybe-uninitialized
>   endif
>
Jani Nikula March 26, 2024, 8:24 p.m. UTC | #2 
On Tue, 26 Mar 2024, Arnd Bergmann <arnd@kernel.org> wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> The -Woverride-init warn about code that may be intentional or not,
> but the inintentional ones tend to be real bugs, so there is a bit of
> disagreement on whether this warning option should be enabled by default
> and we have multiple settings in scripts/Makefile.extrawarn as well as
> individual subsystems.
>
> Older versions of clang only supported -Wno-initializer-overrides with
> the same meaning as gcc's -Woverride-init, though all supported versions
> now work with both. Because of this difference, an earlier cleanup of
> mine accidentally turned the clang warning off for W=1 builds and only
> left it on for W=2, while it's still enabled for gcc with W=1.
>
> There is also one driver that only turns the warning off for newer
> versions of gcc but not other compilers, and some but not all the
> Makefiles still use a cc-disable-warning conditional that is no
> longer needed with supported compilers here.
>
> Address all of the above by removing the special cases for clang
> and always turning the warning off unconditionally where it got
> in the way, using the syntax that is supported by both compilers.
>
> Fixes: 2cd3271b7a31 ("kbuild: avoid duplicate warning options")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/gpu/drm/amd/display/dc/dce110/Makefile |  2 +-
>  drivers/gpu/drm/amd/display/dc/dce112/Makefile |  2 +-
>  drivers/gpu/drm/amd/display/dc/dce120/Makefile |  2 +-
>  drivers/gpu/drm/amd/display/dc/dce60/Makefile  |  2 +-
>  drivers/gpu/drm/amd/display/dc/dce80/Makefile  |  2 +-
>  drivers/gpu/drm/i915/Makefile                  |  6 +++---
>  drivers/gpu/drm/xe/Makefile                    |  4 ++--
>  drivers/net/ethernet/renesas/sh_eth.c          |  2 +-
>  drivers/pinctrl/aspeed/Makefile                |  2 +-
>  fs/proc/Makefile                               |  2 +-
>  kernel/bpf/Makefile                            |  2 +-
>  mm/Makefile                                    |  3 +--
>  scripts/Makefile.extrawarn                     | 10 +++-------
>  13 files changed, 18 insertions(+), 23 deletions(-)
>

[snip]

> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 3ef6ed41e62b..4c2f85632391 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -33,9 +33,9 @@ endif
>  subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror
>  
>  # Fine grained warnings disable
> -CFLAGS_i915_pci.o = $(call cc-disable-warning, override-init)
> -CFLAGS_display/intel_display_device.o = $(call cc-disable-warning, override-init)
> -CFLAGS_display/intel_fbdev.o = $(call cc-disable-warning, override-init)
> +CFLAGS_i915_pci.o = -Wno-override-init
> +CFLAGS_display/intel_display_device.o = -Wno-override-init
> +CFLAGS_display/intel_fbdev.o = -Wno-override-init
>  
>  # Support compiling the display code separately for both i915 and xe
>  # drivers. Define I915 when building i915.
> diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
> index 5a428ca00f10..c29a850859ad 100644
> --- a/drivers/gpu/drm/xe/Makefile
> +++ b/drivers/gpu/drm/xe/Makefile
> @@ -172,8 +172,8 @@ subdir-ccflags-$(CONFIG_DRM_XE_DISPLAY) += \
>  	-Ddrm_i915_gem_object=xe_bo \
>  	-Ddrm_i915_private=xe_device
>  
> -CFLAGS_i915-display/intel_fbdev.o = $(call cc-disable-warning, override-init)
> -CFLAGS_i915-display/intel_display_device.o = $(call cc-disable-warning, override-init)
> +CFLAGS_i915-display/intel_fbdev.o = -Wno-override-init
> +CFLAGS_i915-display/intel_display_device.o = -Wno-override-init

For i915 and xe parts,

Acked-by: Jani Nikula <jani.nikula@intel.com>

>  # Rule to build SOC code shared with i915
>  $(obj)/i915-soc/%.o: $(srctree)/drivers/gpu/drm/i915/soc/%.c FORCE
> diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
> index 475e1e8c1d35..0786eb0da391 100644
> --- a/drivers/net/ethernet/renesas/sh_eth.c
> +++ b/drivers/net/ethernet/renesas/sh_eth.c
> @@ -50,7 +50,7 @@
>   * the macros available to do this only define GCC 8.
>   */
>  __diag_push();
> -__diag_ignore(GCC, 8, "-Woverride-init",
> +__diag_ignore_all("-Woverride-init",
>  	      "logic to initialize all and then override some is OK");

This is nice because it's more localized than the per-file
disable. However, we tried to do this in i915, but this doesn't work for
GCC versions < 8, and some defconfigs enabling -Werror forced us to
revert. See commit 290d16104575 ("Revert "drm/i915: use localized
__diag_ignore_all() instead of per file"").

BR,
Jani.
Arnd Bergmann March 26, 2024, 8:55 p.m. UTC | #3 
On Tue, Mar 26, 2024, at 21:24, Jani Nikula wrote:
> On Tue, 26 Mar 2024, Arnd Bergmann <arnd@kernel.org> wrote:
>> From: Arnd Bergmann <arnd@arndb.de>
>> index 475e1e8c1d35..0786eb0da391 100644
>> --- a/drivers/net/ethernet/renesas/sh_eth.c
>> +++ b/drivers/net/ethernet/renesas/sh_eth.c
>> @@ -50,7 +50,7 @@
>>   * the macros available to do this only define GCC 8.
>>   */
>>  __diag_push();
>> -__diag_ignore(GCC, 8, "-Woverride-init",
>> +__diag_ignore_all("-Woverride-init",
>>  	      "logic to initialize all and then override some is OK");
>
> This is nice because it's more localized than the per-file
> disable. However, we tried to do this in i915, but this doesn't work for
> GCC versions < 8, and some defconfigs enabling -Werror forced us to
> revert. See commit 290d16104575 ("Revert "drm/i915: use localized
> __diag_ignore_all() instead of per file"").

It works now.

The original __diag_ignore_all() only did it for gcc-8 and above
because that was initially needed to suppress warnings that
got added in that version, but this was always a mistake.

689b097a06ba ("compiler-gcc: Suppress -Wmissing-prototypes
warning for all supported GCC") made it work correctly.

     Arnd
Andrew Jeffery March 26, 2024, 11:02 p.m. UTC | #4 
On Tue, 2024-03-26 at 15:47 +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The -Woverride-init warn about code that may be intentional or not,
> but the inintentional ones tend to be real bugs, so there is a bit of
> disagreement on whether this warning option should be enabled by default
> and we have multiple settings in scripts/Makefile.extrawarn as well as
> individual subsystems.
> 
> Older versions of clang only supported -Wno-initializer-overrides with
> the same meaning as gcc's -Woverride-init, though all supported versions
> now work with both. Because of this difference, an earlier cleanup of
> mine accidentally turned the clang warning off for W=1 builds and only
> left it on for W=2, while it's still enabled for gcc with W=1.
> 
> There is also one driver that only turns the warning off for newer
> versions of gcc but not other compilers, and some but not all the
> Makefiles still use a cc-disable-warning conditional that is no
> longer needed with supported compilers here.
> 
> Address all of the above by removing the special cases for clang
> and always turning the warning off unconditionally where it got
> in the way, using the syntax that is supported by both compilers.
> 
> Fixes: 2cd3271b7a31 ("kbuild: avoid duplicate warning options")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/gpu/drm/amd/display/dc/dce110/Makefile |  2 +-
>  drivers/gpu/drm/amd/display/dc/dce112/Makefile |  2 +-
>  drivers/gpu/drm/amd/display/dc/dce120/Makefile |  2 +-
>  drivers/gpu/drm/amd/display/dc/dce60/Makefile  |  2 +-
>  drivers/gpu/drm/amd/display/dc/dce80/Makefile  |  2 +-
>  drivers/gpu/drm/i915/Makefile                  |  6 +++---
>  drivers/gpu/drm/xe/Makefile                    |  4 ++--
>  drivers/net/ethernet/renesas/sh_eth.c          |  2 +-
>  drivers/pinctrl/aspeed/Makefile                |  2 +-

For the Aspeed change:

Acked-by: Andrew Jeffery <andrew@codeconstruct.com.au>

Thanks!
Jani Nikula March 27, 2024, 7:50 a.m. UTC | #5 
On Tue, 26 Mar 2024, "Arnd Bergmann" <arnd@arndb.de> wrote:
> On Tue, Mar 26, 2024, at 21:24, Jani Nikula wrote:
>> On Tue, 26 Mar 2024, Arnd Bergmann <arnd@kernel.org> wrote:
>>> From: Arnd Bergmann <arnd@arndb.de>
>>> index 475e1e8c1d35..0786eb0da391 100644
>>> --- a/drivers/net/ethernet/renesas/sh_eth.c
>>> +++ b/drivers/net/ethernet/renesas/sh_eth.c
>>> @@ -50,7 +50,7 @@
>>>   * the macros available to do this only define GCC 8.
>>>   */
>>>  __diag_push();
>>> -__diag_ignore(GCC, 8, "-Woverride-init",
>>> +__diag_ignore_all("-Woverride-init",
>>>  	      "logic to initialize all and then override some is OK");
>>
>> This is nice because it's more localized than the per-file
>> disable. However, we tried to do this in i915, but this doesn't work for
>> GCC versions < 8, and some defconfigs enabling -Werror forced us to
>> revert. See commit 290d16104575 ("Revert "drm/i915: use localized
>> __diag_ignore_all() instead of per file"").
>
> It works now.
>
> The original __diag_ignore_all() only did it for gcc-8 and above
> because that was initially needed to suppress warnings that
> got added in that version, but this was always a mistake.
>
> 689b097a06ba ("compiler-gcc: Suppress -Wmissing-prototypes
> warning for all supported GCC") made it work correctly.

Oh, nice! Then I think we'd like to go back to __diag_ignore_all() in
i915 and xe.

The diff is below. I'm fine with you squashing it to your patch, or if
you want me to turn it into a proper patch for you to pick up in your
series, that's fine too. Just let me know.

BR,
Jani.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>


diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 3ef6ed41e62b..87d6ba8d2341 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -32,11 +32,6 @@ endif
 # Enable -Werror in CI and development
 subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror
 
-# Fine grained warnings disable
-CFLAGS_i915_pci.o = $(call cc-disable-warning, override-init)
-CFLAGS_display/intel_display_device.o = $(call cc-disable-warning, override-init)
-CFLAGS_display/intel_fbdev.o = $(call cc-disable-warning, override-init)
-
 # Support compiling the display code separately for both i915 and xe
 # drivers. Define I915 when building i915.
 subdir-ccflags-y += -DI915
diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c b/drivers/gpu/drm/i915/display/intel_display_device.c
index c02d79b50006..b8903bd0e82a 100644
--- a/drivers/gpu/drm/i915/display/intel_display_device.c
+++ b/drivers/gpu/drm/i915/display/intel_display_device.c
@@ -17,6 +17,9 @@
 #include "intel_display_reg_defs.h"
 #include "intel_fbc.h"
 
+__diag_push();
+__diag_ignore_all("-Woverride-init", "Allow field initialization overrides for display info");
+
 static const struct intel_display_device_info no_display = {};
 
 #define PIPE_A_OFFSET		0x70000
@@ -768,6 +771,8 @@ static const struct intel_display_device_info xe2_lpd_display = {
 		BIT(INTEL_FBC_C) | BIT(INTEL_FBC_D),
 };
 
+__diag_pop();
+
 /*
  * Separate detection for no display cases to keep the display id array simple.
  *
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 99894a855ef0..43855c6c3509 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -135,6 +135,9 @@ static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
 	return i915_gem_fb_mmap(obj, vma);
 }
 
+__diag_push();
+__diag_ignore_all("-Woverride-init", "Allow field initialization overrides for fb ops");
+
 static const struct fb_ops intelfb_ops = {
 	.owner = THIS_MODULE,
 	__FB_DEFAULT_DEFERRED_OPS_RDWR(intel_fbdev),
@@ -146,6 +149,8 @@ static const struct fb_ops intelfb_ops = {
 	.fb_mmap = intel_fbdev_mmap,
 };
 
+__diag_pop();
+
 static int intelfb_create(struct drm_fb_helper *helper,
 			  struct drm_fb_helper_surface_size *sizes)
 {
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 1e69783ae4fd..405ca17a990b 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -38,6 +38,9 @@
 #include "i915_reg.h"
 #include "intel_pci_config.h"
 
+__diag_push();
+__diag_ignore_all("-Woverride-init", "Allow field initialization overrides for device info");
+
 #define PLATFORM(x) .platform = (x)
 #define GEN(x) \
 	.__runtime.graphics.ip.ver = (x), \
@@ -785,6 +788,8 @@ static const struct intel_device_info mtl_info = {
 
 #undef PLATFORM
 
+__diag_pop();
+
 /*
  * Make sure any device matches here are from most specific to most
  * general.  For example, since the Quanta match is based on the subsystem
diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 3c3e67885559..2f58faf0a79a 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -172,9 +172,6 @@ subdir-ccflags-$(CONFIG_DRM_XE_DISPLAY) += \
 	-Ddrm_i915_gem_object=xe_bo \
 	-Ddrm_i915_private=xe_device
 
-CFLAGS_i915-display/intel_fbdev.o = $(call cc-disable-warning, override-init)
-CFLAGS_i915-display/intel_display_device.o = $(call cc-disable-warning, override-init)
-
 # Rule to build SOC code shared with i915
 $(obj)/i915-soc/%.o: $(srctree)/drivers/gpu/drm/i915/soc/%.c FORCE
 	$(call cmd,force_checksrc)
Arnd Bergmann March 27, 2024, 9:22 a.m. UTC | #6 
On Wed, Mar 27, 2024, at 08:50, Jani Nikula wrote:
> On Tue, 26 Mar 2024, "Arnd Bergmann" <arnd@arndb.de> wrote:
>> On Tue, Mar 26, 2024, at 21:24, Jani Nikula wrote:
>>> On Tue, 26 Mar 2024, Arnd Bergmann <arnd@kernel.org> wrote:
>>
>> It works now.
>>
>> The original __diag_ignore_all() only did it for gcc-8 and above
>> because that was initially needed to suppress warnings that
>> got added in that version, but this was always a mistake.
>>
>> 689b097a06ba ("compiler-gcc: Suppress -Wmissing-prototypes
>> warning for all supported GCC") made it work correctly.
>
> Oh, nice! Then I think we'd like to go back to __diag_ignore_all() in
> i915 and xe.
>
> The diff is below. I'm fine with you squashing it to your patch, or if
> you want me to turn it into a proper patch for you to pick up in your
> series, that's fine too. Just let me know.

I think I'd prefer to keep my patch simpler for the moment and
get that merged through the kbuild tree, it already touches
too many places at once.

It may be better for me to just drop the drivers/gpu/ part of
my patch so you can just just take your patch through the
drm tree. I actually have a similar patch for the amdgpu driver
that I can send if you like this option better.

    Arnd
Linus Walleij March 28, 2024, 9:18 a.m. UTC | #7 
On Tue, Mar 26, 2024 at 3:49 PM Arnd Bergmann <arnd@kernel.org> wrote:

> From: Arnd Bergmann <arnd@arndb.de>
>
> The -Woverride-init warn about code that may be intentional or not,
> but the inintentional ones tend to be real bugs, so there is a bit of
> disagreement on whether this warning option should be enabled by default
> and we have multiple settings in scripts/Makefile.extrawarn as well as
> individual subsystems.
>
> Older versions of clang only supported -Wno-initializer-overrides with
> the same meaning as gcc's -Woverride-init, though all supported versions
> now work with both. Because of this difference, an earlier cleanup of
> mine accidentally turned the clang warning off for W=1 builds and only
> left it on for W=2, while it's still enabled for gcc with W=1.
>
> There is also one driver that only turns the warning off for newer
> versions of gcc but not other compilers, and some but not all the
> Makefiles still use a cc-disable-warning conditional that is no
> longer needed with supported compilers here.
>
> Address all of the above by removing the special cases for clang
> and always turning the warning off unconditionally where it got
> in the way, using the syntax that is supported by both compilers.
>
> Fixes: 2cd3271b7a31 ("kbuild: avoid duplicate warning options")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Neat!
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij
Masahiro Yamada March 31, 2024, 2:33 a.m. UTC | #8 
On Wed, Mar 27, 2024 at 6:23 PM Arnd Bergmann <arnd@arndb.de> wrote:
>
> On Wed, Mar 27, 2024, at 08:50, Jani Nikula wrote:
> > On Tue, 26 Mar 2024, "Arnd Bergmann" <arnd@arndb.de> wrote:
> >> On Tue, Mar 26, 2024, at 21:24, Jani Nikula wrote:
> >>> On Tue, 26 Mar 2024, Arnd Bergmann <arnd@kernel.org> wrote:
> >>
> >> It works now.
> >>
> >> The original __diag_ignore_all() only did it for gcc-8 and above
> >> because that was initially needed to suppress warnings that
> >> got added in that version, but this was always a mistake.
> >>
> >> 689b097a06ba ("compiler-gcc: Suppress -Wmissing-prototypes
> >> warning for all supported GCC") made it work correctly.
> >
> > Oh, nice! Then I think we'd like to go back to __diag_ignore_all() in
> > i915 and xe.
> >
> > The diff is below. I'm fine with you squashing it to your patch, or if
> > you want me to turn it into a proper patch for you to pick up in your
> > series, that's fine too. Just let me know.
>
> I think I'd prefer to keep my patch simpler for the moment and
> get that merged through the kbuild tree, it already touches
> too many places at once.
>
> It may be better for me to just drop the drivers/gpu/ part of
> my patch so you can just just take your patch through the
> drm tree. I actually have a similar patch for the amdgpu driver
> that I can send if you like this option better.
>
>     Arnd
>



Applied to linux-kbuild/fixes.
Thanks.
diff mbox series

Patch

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/Makefile b/drivers/gpu/drm/amd/display/dc/dce110/Makefile
index f0777d61c2cb..c307f040e48f 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dce110/Makefile
@@ -23,7 +23,7 @@ 
 # Makefile for the 'controller' sub-component of DAL.
 # It provides the control and status of HW CRTC block.
 
-CFLAGS_$(AMDDALPATH)/dc/dce110/dce110_resource.o = $(call cc-disable-warning, override-init)
+CFLAGS_$(AMDDALPATH)/dc/dce110/dce110_resource.o = -Wno-override-init
 
 DCE110 = dce110_timing_generator.o \
 dce110_compressor.o dce110_opp_regamma_v.o \
diff --git a/drivers/gpu/drm/amd/display/dc/dce112/Makefile b/drivers/gpu/drm/amd/display/dc/dce112/Makefile
index 7e92effec894..683866797709 100644
--- a/drivers/gpu/drm/amd/display/dc/dce112/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dce112/Makefile
@@ -23,7 +23,7 @@ 
 # Makefile for the 'controller' sub-component of DAL.
 # It provides the control and status of HW CRTC block.
 
-CFLAGS_$(AMDDALPATH)/dc/dce112/dce112_resource.o = $(call cc-disable-warning, override-init)
+CFLAGS_$(AMDDALPATH)/dc/dce112/dce112_resource.o = -Wno-override-init
 
 DCE112 = dce112_compressor.o
 
diff --git a/drivers/gpu/drm/amd/display/dc/dce120/Makefile b/drivers/gpu/drm/amd/display/dc/dce120/Makefile
index 1e3ef68a452a..8f508e662748 100644
--- a/drivers/gpu/drm/amd/display/dc/dce120/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dce120/Makefile
@@ -24,7 +24,7 @@ 
 # It provides the control and status of HW CRTC block.
 
 
-CFLAGS_$(AMDDALPATH)/dc/dce120/dce120_resource.o = $(call cc-disable-warning, override-init)
+CFLAGS_$(AMDDALPATH)/dc/dce120/dce120_resource.o = -Wno-override-init
 
 DCE120 = dce120_timing_generator.o
 
diff --git a/drivers/gpu/drm/amd/display/dc/dce60/Makefile b/drivers/gpu/drm/amd/display/dc/dce60/Makefile
index fee331accc0e..eede83ad91fa 100644
--- a/drivers/gpu/drm/amd/display/dc/dce60/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dce60/Makefile
@@ -23,7 +23,7 @@ 
 # Makefile for the 'controller' sub-component of DAL.
 # It provides the control and status of HW CRTC block.
 
-CFLAGS_$(AMDDALPATH)/dc/dce60/dce60_resource.o = $(call cc-disable-warning, override-init)
+CFLAGS_$(AMDDALPATH)/dc/dce60/dce60_resource.o = -Wno-override-init
 
 DCE60 = dce60_timing_generator.o dce60_hw_sequencer.o \
 	dce60_resource.o
diff --git a/drivers/gpu/drm/amd/display/dc/dce80/Makefile b/drivers/gpu/drm/amd/display/dc/dce80/Makefile
index 7eefffbdc925..fba189d26652 100644
--- a/drivers/gpu/drm/amd/display/dc/dce80/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dce80/Makefile
@@ -23,7 +23,7 @@ 
 # Makefile for the 'controller' sub-component of DAL.
 # It provides the control and status of HW CRTC block.
 
-CFLAGS_$(AMDDALPATH)/dc/dce80/dce80_resource.o = $(call cc-disable-warning, override-init)
+CFLAGS_$(AMDDALPATH)/dc/dce80/dce80_resource.o = -Wno-override-init
 
 DCE80 = dce80_timing_generator.o
 
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 3ef6ed41e62b..4c2f85632391 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -33,9 +33,9 @@  endif
 subdir-ccflags-$(CONFIG_DRM_I915_WERROR) += -Werror
 
 # Fine grained warnings disable
-CFLAGS_i915_pci.o = $(call cc-disable-warning, override-init)
-CFLAGS_display/intel_display_device.o = $(call cc-disable-warning, override-init)
-CFLAGS_display/intel_fbdev.o = $(call cc-disable-warning, override-init)
+CFLAGS_i915_pci.o = -Wno-override-init
+CFLAGS_display/intel_display_device.o = -Wno-override-init
+CFLAGS_display/intel_fbdev.o = -Wno-override-init
 
 # Support compiling the display code separately for both i915 and xe
 # drivers. Define I915 when building i915.
diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 5a428ca00f10..c29a850859ad 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -172,8 +172,8 @@  subdir-ccflags-$(CONFIG_DRM_XE_DISPLAY) += \
 	-Ddrm_i915_gem_object=xe_bo \
 	-Ddrm_i915_private=xe_device
 
-CFLAGS_i915-display/intel_fbdev.o = $(call cc-disable-warning, override-init)
-CFLAGS_i915-display/intel_display_device.o = $(call cc-disable-warning, override-init)
+CFLAGS_i915-display/intel_fbdev.o = -Wno-override-init
+CFLAGS_i915-display/intel_display_device.o = -Wno-override-init
 
 # Rule to build SOC code shared with i915
 $(obj)/i915-soc/%.o: $(srctree)/drivers/gpu/drm/i915/soc/%.c FORCE
diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 475e1e8c1d35..0786eb0da391 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -50,7 +50,7 @@ 
  * the macros available to do this only define GCC 8.
  */
 __diag_push();
-__diag_ignore(GCC, 8, "-Woverride-init",
+__diag_ignore_all("-Woverride-init",
 	      "logic to initialize all and then override some is OK");
 static const u16 sh_eth_offset_gigabit[SH_ETH_MAX_REGISTER_OFFSET] = {
 	SH_ETH_OFFSET_DEFAULTS,
diff --git a/drivers/pinctrl/aspeed/Makefile b/drivers/pinctrl/aspeed/Makefile
index 489ea1778353..db2a7600ae2b 100644
--- a/drivers/pinctrl/aspeed/Makefile
+++ b/drivers/pinctrl/aspeed/Makefile
@@ -1,7 +1,7 @@ 
 # SPDX-License-Identifier: GPL-2.0-only
 # Aspeed pinctrl support
 
-ccflags-y += $(call cc-option,-Woverride-init)
+ccflags-y += -Woverride-init
 obj-$(CONFIG_PINCTRL_ASPEED)	+= pinctrl-aspeed.o pinmux-aspeed.o
 obj-$(CONFIG_PINCTRL_ASPEED_G4)	+= pinctrl-aspeed-g4.o
 obj-$(CONFIG_PINCTRL_ASPEED_G5)	+= pinctrl-aspeed-g5.o
diff --git a/fs/proc/Makefile b/fs/proc/Makefile
index bd08616ed8ba..7b4db9c56e6a 100644
--- a/fs/proc/Makefile
+++ b/fs/proc/Makefile
@@ -5,7 +5,7 @@ 
 
 obj-y   += proc.o
 
-CFLAGS_task_mmu.o	+= $(call cc-option,-Wno-override-init,)
+CFLAGS_task_mmu.o	+= -Wno-override-init
 proc-y			:= nommu.o task_nommu.o
 proc-$(CONFIG_MMU)	:= task_mmu.o
 
diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile
index 368c5d86b5b7..e497011261b8 100644
--- a/kernel/bpf/Makefile
+++ b/kernel/bpf/Makefile
@@ -4,7 +4,7 @@  ifneq ($(CONFIG_BPF_JIT_ALWAYS_ON),y)
 # ___bpf_prog_run() needs GCSE disabled on x86; see 3193c0836f203 for details
 cflags-nogcse-$(CONFIG_X86)$(CONFIG_CC_IS_GCC) := -fno-gcse
 endif
-CFLAGS_core.o += $(call cc-disable-warning, override-init) $(cflags-nogcse-yy)
+CFLAGS_core.o += -Wno-override-init $(cflags-nogcse-yy)
 
 obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o tnum.o log.o token.o
 obj-$(CONFIG_BPF_SYSCALL) += bpf_iter.o map_iter.o task_iter.o prog_iter.o link_iter.o
diff --git a/mm/Makefile b/mm/Makefile
index e4b5b75aaec9..4abb40b911ec 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -29,8 +29,7 @@  KCOV_INSTRUMENT_mmzone.o := n
 KCOV_INSTRUMENT_vmstat.o := n
 KCOV_INSTRUMENT_failslab.o := n
 
-CFLAGS_init-mm.o += $(call cc-disable-warning, override-init)
-CFLAGS_init-mm.o += $(call cc-disable-warning, initializer-overrides)
+CFLAGS_init-mm.o += -Wno-override-init
 
 mmu-y			:= nommu.o
 mmu-$(CONFIG_MMU)	:= highmem.o memory.o mincore.o \
diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index 3ce5d503a6da..c5af566e911a 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -114,6 +114,8 @@  KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
 KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 
+KBUILD_CFLAGS += -Wno-override-init # alias for -Wno-initializer-overrides in clang
+
 ifdef CONFIG_CC_IS_CLANG
 # Clang before clang-16 would warn on default argument promotions.
 ifneq ($(call clang-min-version, 160000),y)
@@ -151,10 +153,6 @@  KBUILD_CFLAGS += -Wtype-limits
 KBUILD_CFLAGS += $(call cc-option, -Wmaybe-uninitialized)
 KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
 
-ifdef CONFIG_CC_IS_CLANG
-KBUILD_CFLAGS += -Winitializer-overrides
-endif
-
 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN2
 
 else
@@ -164,9 +162,7 @@  KBUILD_CFLAGS += -Wno-missing-field-initializers
 KBUILD_CFLAGS += -Wno-type-limits
 KBUILD_CFLAGS += -Wno-shift-negative-value
 
-ifdef CONFIG_CC_IS_CLANG
-KBUILD_CFLAGS += -Wno-initializer-overrides
-else
+ifdef CONFIG_CC_IS_GCC
 KBUILD_CFLAGS += -Wno-maybe-uninitialized
 endif