[PATCH 00/34] address all -Wunused-const warnings
From: Arnd Bergmann arnd@arndb.de
Compilers traditionally warn for unused 'static' variables, but not if they are constant. The reason here is a custom for C++ programmers to define named constants as 'static const' variables in header files instead of using macros or enums.
In W=1 builds, we get warnings only static const variables in C files, but not in headers, which is a good compromise, but this still produces warning output in at least 30 files. These warnings are almost all harmless, but also trivial to fix, and there is no good reason to warn only about the non-const variables being unused.
I've gone through all the files that I found using randconfig and allmodconfig builds and created patches to avoid these warnings, with the goal of retaining a clean build once the option is enabled by default.
Unfortunately, there is one fairly large patch ("drivers: remove incorrect of_match_ptr/ACPI_PTR annotations") that touches 34 individual drivers that all need the same one-line change. If necessary, I can split it up by driver or by subsystem, but at least for reviewing I would keep it as one piece for the moment.
Please merge the individual patches through subsystem trees. I expect that some of these will have to go through multiple revisions before they are picked up, so anything that gets applied early saves me from resending.
Arnd
Arnd Bergmann (31): powerpc/fsl-soc: hide unused const variable ubsan: fix unused variable warning in test module platform: goldfish: remove ACPI_PTR() annotations i2c: pxa: hide unused icr_bits[] variable 3c515: remove unused 'mtu' variable tracing: hide unused ftrace_event_id_fops Input: synaptics: hide unused smbus_pnp_ids[] array power: rt9455: hide unused rt9455_boost_voltage_values efi: sysfb: don't build when EFI is disabled clk: ti: dpll: fix incorrect #ifdef checks apm-emulation: hide an unused variable sisfb: hide unused variables dma/congiguous: avoid warning about unused size_bytes leds: apu: remove duplicate DMI lookup data iio: ad5755: hook up of_device_id lookup to platform driver greybus: arche-ctrl: move device table to its right location lib: checksum: hide unused expected_csum_ipv6_magic[] sunrpc: suppress warnings for unused procfs functions comedi: ni_atmio: avoid warning for unused device_ids[] table iwlegacy: don't warn for unused variables with DEBUG_FS=n drm/komeda: don't warn for unused debugfs files firmware: qcom_scm: mark qcom_scm_qseecom_allowlist as __maybe_unused crypto: ccp - drop platform ifdef checks usb: gadget: omap_udc: remove unused variable isdn: kcapi: don't build unused procfs code cpufreq: intel_pstate: hide unused intel_pstate_cpu_oob_ids[] net: xgbe: remove extraneous #ifdef checks Input: imagis - remove incorrect ifdef checks sata: mv: drop unnecessary #ifdef checks ASoC: remove incorrect of_match_ptr/ACPI_PTR annotations spi: remove incorrect of_match_ptr annotations drivers: remove incorrect of_match_ptr/ACPI_PTR annotations kbuild: always enable -Wunused-const-variable
Krzysztof Kozlowski (1): Input: stmpe-ts - mark OF related data as maybe unused
arch/powerpc/sysdev/fsl_msi.c | 2 + drivers/ata/sata_mv.c | 64 +++++++++---------- drivers/char/apm-emulation.c | 5 +- drivers/char/ipmi/ipmb_dev_int.c | 2 +- drivers/char/tpm/tpm_ftpm_tee.c | 2 +- drivers/clk/ti/dpll.c | 10 ++- drivers/comedi/drivers/ni_atmio.c | 2 +- drivers/cpufreq/intel_pstate.c | 2 + drivers/crypto/ccp/sp-platform.c | 14 +--- drivers/dma/img-mdc-dma.c | 2 +- drivers/firmware/efi/Makefile | 3 +- drivers/firmware/efi/sysfb_efi.c | 2 - drivers/firmware/qcom/qcom_scm.c | 2 +- drivers/fpga/versal-fpga.c | 2 +- .../gpu/drm/arm/display/komeda/komeda_dev.c | 8 --- drivers/hid/hid-google-hammer.c | 6 +- drivers/i2c/busses/i2c-pxa.c | 2 +- drivers/i2c/muxes/i2c-mux-ltc4306.c | 2 +- drivers/i2c/muxes/i2c-mux-reg.c | 2 +- drivers/iio/dac/ad5755.c | 1 + drivers/input/mouse/synaptics.c | 2 + drivers/input/touchscreen/imagis.c | 4 +- drivers/input/touchscreen/stmpe-ts.c | 2 +- drivers/input/touchscreen/wdt87xx_i2c.c | 2 +- drivers/isdn/capi/Makefile | 3 +- drivers/isdn/capi/kcapi.c | 7 +- drivers/leds/leds-apu.c | 3 +- drivers/mux/adg792a.c | 2 +- drivers/net/ethernet/3com/3c515.c | 3 - drivers/net/ethernet/amd/xgbe/xgbe-platform.c | 8 --- drivers/net/ethernet/apm/xgene-v2/main.c | 2 +- drivers/net/ethernet/hisilicon/hns_mdio.c | 2 +- drivers/net/wireless/intel/iwlegacy/4965-rs.c | 15 +---- drivers/net/wireless/intel/iwlegacy/common.h | 2 - drivers/platform/goldfish/goldfish_pipe.c | 2 +- drivers/power/supply/rt9455_charger.c | 2 + drivers/regulator/pbias-regulator.c | 2 +- drivers/regulator/twl-regulator.c | 2 +- drivers/regulator/twl6030-regulator.c | 2 +- drivers/rtc/rtc-fsl-ftm-alarm.c | 2 +- drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 2 +- drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 2 +- drivers/spi/spi-armada-3700.c | 2 +- drivers/spi/spi-img-spfi.c | 2 +- drivers/spi/spi-meson-spicc.c | 2 +- drivers/spi/spi-meson-spifc.c | 2 +- drivers/spi/spi-orion.c | 2 +- drivers/spi/spi-pic32-sqi.c | 2 +- drivers/spi/spi-pic32.c | 2 +- drivers/spi/spi-rockchip.c | 2 +- drivers/spi/spi-s3c64xx.c | 2 +- drivers/spi/spi-st-ssc4.c | 2 +- drivers/staging/greybus/arche-apb-ctrl.c | 1 + drivers/staging/greybus/arche-platform.c | 9 +-- drivers/staging/pi433/pi433_if.c | 2 +- drivers/tty/serial/amba-pl011.c | 6 +- drivers/tty/serial/ma35d1_serial.c | 2 +- drivers/usb/gadget/udc/omap_udc.c | 10 +-- drivers/video/fbdev/sis/init301.c | 3 +- kernel/dma/contiguous.c | 2 +- kernel/trace/trace_events.c | 4 ++ lib/checksum_kunit.c | 2 + lib/test_ubsan.c | 2 +- net/sunrpc/cache.c | 10 +-- scripts/Makefile.extrawarn | 1 - sound/soc/atmel/sam9x5_wm8731.c | 2 +- sound/soc/codecs/rt5514-spi.c | 2 +- sound/soc/qcom/lpass-sc7280.c | 2 +- sound/soc/samsung/aries_wm8994.c | 2 +- 69 files changed, 121 insertions(+), 169 deletions(-)
From: Arnd Bergmann arnd@arndb.de
When building with CONFIG_OF and/or CONFIG_ACPI disabled but W=1 extra warnings enabled, a lot of driver cause a warning about an unused ID table:
sound/soc/atmel/sam9x5_wm8731.c:187:34: error: unused variable 'sam9x5_wm8731_of_match' [-Werror,-Wunused-const-variable] sound/soc/codecs/rt5514-spi.c:496:34: error: unused variable 'rt5514_of_match' [-Werror,-Wunused-const-variable] sound/soc/samsung/aries_wm8994.c:524:34: error: unused variable 'samsung_wm8994_of_match' [-Werror,-Wunused-const-variable]
The fix is always to just remove the of_match_ptr() and ACPI_PTR() wrappers that remove the reference, rather than adding another #ifdef just for build testing for a configuration that doesn't matter in practice.
Signed-off-by: Arnd Bergmann arnd@arndb.de --- sound/soc/amd/acp3x-rt5682-max9836.c | 2 +- sound/soc/atmel/sam9x5_wm8731.c | 2 +- sound/soc/codecs/rt5514-spi.c | 2 +- sound/soc/qcom/lpass-sc7280.c | 2 +- sound/soc/samsung/aries_wm8994.c | 2 +- 5 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/sound/soc/amd/acp3x-rt5682-max9836.c b/sound/soc/amd/acp3x-rt5682-max9836.c index d6cdb6d9fdd6..ffc105759994 100644 --- a/sound/soc/amd/acp3x-rt5682-max9836.c +++ b/sound/soc/amd/acp3x-rt5682-max9836.c @@ -543,7 +543,7 @@ MODULE_DEVICE_TABLE(acpi, acp3x_audio_acpi_match); static struct platform_driver acp3x_audio = { .driver = { .name = "acp3x-alc5682-max98357", - .acpi_match_table = ACPI_PTR(acp3x_audio_acpi_match), + .acpi_match_table = acp3x_audio_acpi_match, .pm = &snd_soc_pm_ops, }, .probe = acp3x_probe, diff --git a/sound/soc/atmel/sam9x5_wm8731.c b/sound/soc/atmel/sam9x5_wm8731.c index d1c1f370a9cd..95c8c37478a3 100644 --- a/sound/soc/atmel/sam9x5_wm8731.c +++ b/sound/soc/atmel/sam9x5_wm8731.c @@ -193,7 +193,7 @@ MODULE_DEVICE_TABLE(of, sam9x5_wm8731_of_match); static struct platform_driver sam9x5_wm8731_driver = { .driver = { .name = DRV_NAME, - .of_match_table = of_match_ptr(sam9x5_wm8731_of_match), + .of_match_table = sam9x5_wm8731_of_match, }, .probe = sam9x5_wm8731_driver_probe, .remove_new = sam9x5_wm8731_driver_remove, diff --git a/sound/soc/codecs/rt5514-spi.c b/sound/soc/codecs/rt5514-spi.c index f475c8cfadae..da397db8d7d5 100644 --- a/sound/soc/codecs/rt5514-spi.c +++ b/sound/soc/codecs/rt5514-spi.c @@ -503,7 +503,7 @@ static struct spi_driver rt5514_spi_driver = { .driver = { .name = "rt5514", .pm = &rt5514_pm_ops, - .of_match_table = of_match_ptr(rt5514_of_match), + .of_match_table = rt5514_of_match, }, .probe = rt5514_spi_probe, }; diff --git a/sound/soc/qcom/lpass-sc7280.c b/sound/soc/qcom/lpass-sc7280.c index 47c622327a8d..c91620128fd4 100644 --- a/sound/soc/qcom/lpass-sc7280.c +++ b/sound/soc/qcom/lpass-sc7280.c @@ -441,7 +441,7 @@ MODULE_DEVICE_TABLE(of, sc7280_lpass_cpu_device_id); static struct platform_driver sc7280_lpass_cpu_platform_driver = { .driver = { .name = "sc7280-lpass-cpu", - .of_match_table = of_match_ptr(sc7280_lpass_cpu_device_id), + .of_match_table = sc7280_lpass_cpu_device_id, .pm = &sc7280_lpass_pm_ops, }, .probe = asoc_qcom_lpass_cpu_platform_probe, diff --git a/sound/soc/samsung/aries_wm8994.c b/sound/soc/samsung/aries_wm8994.c index a548ac33dd94..9f7318c4ee33 100644 --- a/sound/soc/samsung/aries_wm8994.c +++ b/sound/soc/samsung/aries_wm8994.c @@ -689,7 +689,7 @@ static int aries_audio_probe(struct platform_device *pdev) static struct platform_driver aries_audio_driver = { .driver = { .name = "aries-audio-wm8994", - .of_match_table = of_match_ptr(samsung_wm8994_of_match), + .of_match_table = samsung_wm8994_of_match, .pm = &snd_soc_pm_ops, }, .probe = aries_audio_probe,
On 03/04/2024 10:06, Arnd Bergmann wrote:
From: Arnd Bergmann arnd@arndb.de
When building with CONFIG_OF and/or CONFIG_ACPI disabled but W=1 extra warnings enabled, a lot of driver cause a warning about an unused ID table:
sound/soc/atmel/sam9x5_wm8731.c:187:34: error: unused variable 'sam9x5_wm8731_of_match' [-Werror,-Wunused-const-variable] sound/soc/codecs/rt5514-spi.c:496:34: error: unused variable 'rt5514_of_match' [-Werror,-Wunused-const-variable] sound/soc/samsung/aries_wm8994.c:524:34: error: unused variable 'samsung_wm8994_of_match' [-Werror,-Wunused-const-variable]
The fix is always to just remove the of_match_ptr() and ACPI_PTR() wrappers that remove the reference, rather than adding another #ifdef just for build testing for a configuration that doesn't matter in practice.
Signed-off-by: Arnd Bergmann arnd@arndb.de
sound/soc/amd/acp3x-rt5682-max9836.c | 2 +- sound/soc/atmel/sam9x5_wm8731.c | 2 +- sound/soc/codecs/rt5514-spi.c | 2 +- sound/soc/qcom/lpass-sc7280.c | 2 +- sound/soc/samsung/aries_wm8994.c | 2 +-
I sent it already as well: https://lore.kernel.org/all/20230310214333.274903-5-krzysztof.kozlowski@lina...
and Mark did not pick it up, I guess for the same reason as SPI.
Best regards, Krzysztof
On Wed, Apr 03, 2024 at 10:06:50AM +0200, Arnd Bergmann wrote:
From: Arnd Bergmann arnd@arndb.de
When building with CONFIG_OF and/or CONFIG_ACPI disabled but W=1 extra warnings enabled, a lot of driver cause a warning about an unused ID table:
sound/soc/atmel/sam9x5_wm8731.c:187:34: error: unused variable 'sam9x5_wm8731_of_match' [-Werror,-Wunused-const-variable] sound/soc/codecs/rt5514-spi.c:496:34: error: unused variable 'rt5514_of_match' [-Werror,-Wunused-const-variable] sound/soc/samsung/aries_wm8994.c:524:34: error: unused variable 'samsung_wm8994_of_match' [-Werror,-Wunused-const-variable]
The fix is always to just remove the of_match_ptr() and ACPI_PTR() wrappers that remove the reference, rather than adding another #ifdef just for build testing for a configuration that doesn't matter in practice.
...
index d6cdb6d9fdd6..ffc105759994 100644 --- a/sound/soc/amd/acp3x-rt5682-max9836.c +++ b/sound/soc/amd/acp3x-rt5682-max9836.c @@ -543,7 +543,7 @@ MODULE_DEVICE_TABLE(acpi, acp3x_audio_acpi_match); static struct platform_driver acp3x_audio = { .driver = { .name = "acp3x-alc5682-max98357",
.acpi_match_table = ACPI_PTR(acp3x_audio_acpi_match),
.acpi_match_table = acp3x_audio_acpi_match,
Replace acpi_match_device() by device_get_match_data() and acpi.h by mod_devicetable.h + property.h.
I really would like to see agnostic drivers (when they don't need of*.h/acpi.h to be included as "proxy" headers).
With this, the change probably needs to be separated from this patch.
If you address as suggested, Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com
...
The rest I haven't checked, it might be possible to do something similar there as well.
Hello:
This series was applied to netdev/net-next.git (main) by Jakub Kicinski kuba@kernel.org:
On Wed, 3 Apr 2024 10:06:18 +0200 you wrote:
From: Arnd Bergmann arnd@arndb.de
Compilers traditionally warn for unused 'static' variables, but not if they are constant. The reason here is a custom for C++ programmers to define named constants as 'static const' variables in header files instead of using macros or enums.
[...]
Here is the summary with links: - [05/34] 3c515: remove unused 'mtu' variable https://git.kernel.org/netdev/net-next/c/17b35355c2c6 - [19/34] sunrpc: suppress warnings for unused procfs functions (no matching commit) - [26/34] isdn: kcapi: don't build unused procfs code https://git.kernel.org/netdev/net-next/c/91188544af06 - [28/34] net: xgbe: remove extraneous #ifdef checks https://git.kernel.org/netdev/net-next/c/0ef416e045ad - [33/34] drivers: remove incorrect of_match_ptr/ACPI_PTR annotations (no matching commit)
You are awesome, thank you!
On Wed, 03 Apr 2024 10:06:18 +0200, Arnd Bergmann wrote:
From: Arnd Bergmann arnd@arndb.de
Compilers traditionally warn for unused 'static' variables, but not if they are constant. The reason here is a custom for C++ programmers to define named constants as 'static const' variables in header files instead of using macros or enums.
[...]
Applied, thanks!
[09/34] power: rt9455: hide unused rt9455_boost_voltage_values commit: 452d8950db3e839aba1bb13bc5378f4bac11fa04
Best regards,
On Wed, 03 Apr 2024 10:06:18 +0200, Arnd Bergmann wrote:
Compilers traditionally warn for unused 'static' variables, but not if they are constant. The reason here is a custom for C++ programmers to define named constants as 'static const' variables in header files instead of using macros or enums.
In W=1 builds, we get warnings only static const variables in C files, but not in headers, which is a good compromise, but this still produces warning output in at least 30 files. These warnings are almost all harmless, but also trivial to fix, and there is no good reason to warn only about the non-const variables being unused.
[...]
Applied to powerpc/next.
[01/34] powerpc/fsl-soc: hide unused const variable https://git.kernel.org/powerpc/c/01acaf3aa75e1641442cc23d8fe0a7bb4226efb1
cheers
On Wed, Apr 03, 2024 at 10:06:18AM +0200, Arnd Bergmann wrote:
From: Arnd Bergmann arnd@arndb.de
Compilers traditionally warn for unused 'static' variables, but not if they are constant. The reason here is a custom for C++ programmers to define named constants as 'static const' variables in header files instead of using macros or enums.
In W=1 builds, we get warnings only static const variables in C files, but not in headers, which is a good compromise, but this still produces warning output in at least 30 files. These warnings are almost all harmless, but also trivial to fix, and there is no good reason to warn only about the non-const variables being unused.
I've gone through all the files that I found using randconfig and allmodconfig builds and created patches to avoid these warnings, with the goal of retaining a clean build once the option is enabled by default.
Unfortunately, there is one fairly large patch ("drivers: remove incorrect of_match_ptr/ACPI_PTR annotations") that touches 34 individual drivers that all need the same one-line change. If necessary, I can split it up by driver or by subsystem, but at least for reviewing I would keep it as one piece for the moment.
Please merge the individual patches through subsystem trees. I expect that some of these will have to go through multiple revisions before they are picked up, so anything that gets applied early saves me from resending.
Arnd, can you refresh this one? It seems some misses still... I have got 3+ 0-day reports against one of the mux drivers.
https://lore.kernel.org/all/?q=adg792a.c
participants (7)
-
Andy Shevchenko -
Andy Shevchenko -
Arnd Bergmann -
Krzysztof Kozlowski -
Michael Ellerman -
patchwork-bot+netdevbpf＠kernel.org -
Sebastian Reichel