| Message ID | 20250120153817.11807-1-ansuelsmth@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | pmdomain: airoha: Fix compilation error with Clang-20 and Thumb2 mode | expand |
diff --git a/drivers/pmdomain/mediatek/Makefile b/drivers/pmdomain/mediatek/Makefile index 0f6edce9239b..18ba92e3c418 100644 --- a/drivers/pmdomain/mediatek/Makefile +++ b/drivers/pmdomain/mediatek/Makefile @@ -2,3 +2,10 @@ obj-$(CONFIG_MTK_SCPSYS) += mtk-scpsys.o obj-$(CONFIG_MTK_SCPSYS_PM_DOMAINS) += mtk-pm-domains.o obj-$(CONFIG_AIROHA_CPU_PM_DOMAIN) += airoha-cpu-pmdomain.o + +ifeq ($(CONFIG_THUMB2_KERNEL)$(CONFIG_CC_IS_CLANG),yy) +# The use of R7 in the SMCCC conflicts with the compiler's use of R7 as a frame +# pointer in Thumb2 mode, which is forcibly enabled by Clang when profiling +# hooks are inserted via the -pg switch. +CFLAGS_REMOVE_airoha-cpu-pmdomain.o += $(CC_FLAGS_FTRACE) +endif
The use of R7 in the SMCCC conflicts with the compiler's use of R7 as a frame pointer in Thumb2 mode, which is forcibly enabled by Clang when profiling hooks are inserted via the -pg switch. This is a known issue and similar driver workaround this with a Makefile ifdef. Exact workaround are applied in drivers/firmware/arm_scmi/transports/Makefile and other similar driver. Suggested-by: Sudeep Holla <sudeep.holla@arm.com> Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202501201840.XmpHXpQ4-lkp@intel.com/ Fixes: 82e703dd438b ("pmdomain: airoha: Add Airoha CPU PM Domain support") Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> --- drivers/pmdomain/mediatek/Makefile | 7 +++++++ 1 file changed, 7 insertions(+)