| Message ID | 20240305-disable-extra-clang-enum-warnings-v2-1-ba529ec15f95@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] kbuild: Move -Wenum-{compare-conditional,enum-conversion} into W=1 | expand |
On Tue, Mar 5, 2024, at 23:12, Nathan Chancellor wrote: > Cc: stable@vger.kernel.org > Closes: https://github.com/ClangBuiltLinux/linux/issues/2002 > Link: > https://github.com/llvm/llvm-project/commit/8c2ae42b3e1c6aa7c18f873edcebff7c0b45a37e > Acked-by: Yonghong Song <yonghong.song@linux.dev> > Signed-off-by: Nathan Chancellor <nathan@kernel.org> Acked-by: Arnd Bergmann <arnd@arndb.de>
On Wed, Mar 6, 2024 at 7:12 AM Nathan Chancellor <nathan@kernel.org> wrote: > > Clang enables -Wenum-enum-conversion and -Wenum-compare-conditional > under -Wenum-conversion. A recent change in Clang strengthened these > warnings and they appear frequently in common builds, primarily due to > several instances in common headers but there are quite a few drivers > that have individual instances as well. > > include/linux/vmstat.h:508:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] > 508 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + > | ~~~~~~~~~~~~~~~~~~~~~ ^ > 509 | item]; > | ~~~~ > > drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c:955:24: warning: conditional expression between different enumeration types ('enum iwl_mac_beacon_flags' and 'enum iwl_mac_beacon_flags_v1') [-Wenum-compare-conditional] > 955 | flags |= is_new_rate ? IWL_MAC_BEACON_CCK > | ^ ~~~~~~~~~~~~~~~~~~ > 956 | : IWL_MAC_BEACON_CCK_V1; > | ~~~~~~~~~~~~~~~~~~~~~ > drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c:1120:21: warning: conditional expression between different enumeration types ('enum iwl_mac_beacon_flags' and 'enum iwl_mac_beacon_flags_v1') [-Wenum-compare-conditional] > 1120 | 0) > 10 ? > | ^ > 1121 | IWL_MAC_BEACON_FILS : > | ~~~~~~~~~~~~~~~~~~~ > 1122 | IWL_MAC_BEACON_FILS_V1; > | ~~~~~~~~~~~~~~~~~~~~~~ > > Doing arithmetic between or returning two different types of enums could > be a bug, so each of the instance of the warning needs to be evaluated. > Unfortunately, as mentioned above, there are many instances of this > warning in many different configurations, which can break the build when > CONFIG_WERROR is enabled. > > To avoid introducing new instances of the warnings while cleaning up the > disruption for the majority of users, disable these warnings for the > default build while leaving them on for W=1 builds. > > Cc: stable@vger.kernel.org > Closes: https://github.com/ClangBuiltLinux/linux/issues/2002 > Link: https://github.com/llvm/llvm-project/commit/8c2ae42b3e1c6aa7c18f873edcebff7c0b45a37e > Acked-by: Yonghong Song <yonghong.song@linux.dev> > Signed-off-by: Nathan Chancellor <nathan@kernel.org> > --- > Changes in v2: > - Only disable the warning for the default build, leave it on for W=1 (Arnd) > - Add Yonghong's ack, as the warning is still disabled for the default > build. > - Link to v1: https://lore.kernel.org/r/20240305-disable-extra-clang-enum-warnings-v1-1-6a93ef3d35ff@kernel.org Applied to linux-kbuild. Thanks.
From: Nathan Chancellor > Sent: 05 March 2024 22:13 ... > drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c:1120:21: warning: conditional > expression between different enumeration types ('enum iwl_mac_beacon_flags' and > 'enum iwl_mac_beacon_flags_v1') [-Wenum-compare-conditional] > 1120 | 0) > 10 ? > | ^ > 1121 | IWL_MAC_BEACON_FILS : > | ~~~~~~~~~~~~~~~~~~~ > 1122 | IWL_MAC_BEACON_FILS_V1; > | ~~~~~~~~~~~~~~~~~~~~~~ > > Doing arithmetic between or returning two different types of enums could > be a bug, so each of the instance of the warning needs to be evaluated. > Unfortunately, as mentioned above, there are many instances of this > warning in many different configurations, which can break the build when > CONFIG_WERROR is enabled. I'm not sure what is being done to avoid this warning. (Apart from not using enum to define related integer constants.) Until the compilers get even more clever^Wstupid perhaps the simplest way is to just add '+ 0' to one of the enum values. In code terms it is much safer than any cast. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn index a9e552a1e910..2f25a1de129d 100644 --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -132,6 +132,8 @@ KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast) KBUILD_CFLAGS += -Wno-tautological-constant-out-of-range-compare KBUILD_CFLAGS += $(call cc-disable-warning, unaligned-access) KBUILD_CFLAGS += $(call cc-disable-warning, cast-function-type-strict) +KBUILD_CFLAGS += -Wno-enum-compare-conditional +KBUILD_CFLAGS += -Wno-enum-enum-conversion endif endif
Clang enables -Wenum-enum-conversion and -Wenum-compare-conditional under -Wenum-conversion. A recent change in Clang strengthened these warnings and they appear frequently in common builds, primarily due to several instances in common headers but there are quite a few drivers that have individual instances as well. include/linux/vmstat.h:508:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 508 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 509 | item]; | ~~~~ drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c:955:24: warning: conditional expression between different enumeration types ('enum iwl_mac_beacon_flags' and 'enum iwl_mac_beacon_flags_v1') [-Wenum-compare-conditional] 955 | flags |= is_new_rate ? IWL_MAC_BEACON_CCK | ^ ~~~~~~~~~~~~~~~~~~ 956 | : IWL_MAC_BEACON_CCK_V1; | ~~~~~~~~~~~~~~~~~~~~~ drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c:1120:21: warning: conditional expression between different enumeration types ('enum iwl_mac_beacon_flags' and 'enum iwl_mac_beacon_flags_v1') [-Wenum-compare-conditional] 1120 | 0) > 10 ? | ^ 1121 | IWL_MAC_BEACON_FILS : | ~~~~~~~~~~~~~~~~~~~ 1122 | IWL_MAC_BEACON_FILS_V1; | ~~~~~~~~~~~~~~~~~~~~~~ Doing arithmetic between or returning two different types of enums could be a bug, so each of the instance of the warning needs to be evaluated. Unfortunately, as mentioned above, there are many instances of this warning in many different configurations, which can break the build when CONFIG_WERROR is enabled. To avoid introducing new instances of the warnings while cleaning up the disruption for the majority of users, disable these warnings for the default build while leaving them on for W=1 builds. Cc: stable@vger.kernel.org Closes: https://github.com/ClangBuiltLinux/linux/issues/2002 Link: https://github.com/llvm/llvm-project/commit/8c2ae42b3e1c6aa7c18f873edcebff7c0b45a37e Acked-by: Yonghong Song <yonghong.song@linux.dev> Signed-off-by: Nathan Chancellor <nathan@kernel.org> --- Changes in v2: - Only disable the warning for the default build, leave it on for W=1 (Arnd) - Add Yonghong's ack, as the warning is still disabled for the default build. - Link to v1: https://lore.kernel.org/r/20240305-disable-extra-clang-enum-warnings-v1-1-6a93ef3d35ff@kernel.org --- scripts/Makefile.extrawarn | 2 ++ 1 file changed, 2 insertions(+) --- base-commit: 90d35da658da8cff0d4ecbb5113f5fac9d00eb72 change-id: 20240304-disable-extra-clang-enum-warnings-bf574c7c99fd Best regards,