niansa-misc/linux
1
0
Fork 0
mirror of synced 2025-03-06 20:59:54 +01:00
Code Issues Projects Releases Packages Wiki Activity

pmdomain: airoha: Fix compilation error with Clang-20 and Thumb2 mode

Browse source 
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: 82e703dd43 ("pmdomain: airoha: Add Airoha CPU PM Domain support")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Link: https://lore.kernel.org/r/20250120153817.11807-1-ansuelsmth@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Christian Marangi 2025-01-20 16:38:09 +01:00 • committed by Ulf Hansson
parent c2d7aa308e
commit 885f5669f2
1 changed files with 7 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
drivers/pmdomain/mediatek/Makefile
View file

@ -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