6.6-stable review patch. If anyone has any objections, please let me know.
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From: Heiko Carstens hca@linux.ibm.com
[ Upstream commit fccb175bc89a0d37e3ff513bb6bf1f73b3a48950 ]
Only a couple of files of the decompressor are compiled with the minimum architecture level. This is problematic for potential function calls between compile units, especially if a target function is within a compile until compiled for a higher architecture level, since that may lead to an unexpected operation exception.
Therefore compile all files of the decompressor for the same (minimum) architecture level.
Reviewed-by: Sven Schnelle svens@linux.ibm.com Signed-off-by: Heiko Carstens hca@linux.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/s390/boot/Makefile | 19 +++++-------------- 1 file changed, 5 insertions(+), 14 deletions(-)
diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile index c7c81e5f92189..e4def3a6c6cca 100644 --- a/arch/s390/boot/Makefile +++ b/arch/s390/boot/Makefile @@ -9,11 +9,8 @@ UBSAN_SANITIZE := n KASAN_SANITIZE := n KCSAN_SANITIZE := n
-KBUILD_AFLAGS := $(KBUILD_AFLAGS_DECOMPRESSOR) -KBUILD_CFLAGS := $(KBUILD_CFLAGS_DECOMPRESSOR) - # -# Use minimum architecture for als.c to be able to print an error +# Use minimum architecture level so it is possible to print an error # message if the kernel is started on a machine which is too old # ifndef CONFIG_CC_IS_CLANG @@ -22,16 +19,10 @@ else CC_FLAGS_MARCH_MINIMUM := -march=z10 endif
-ifneq ($(CC_FLAGS_MARCH),$(CC_FLAGS_MARCH_MINIMUM)) -AFLAGS_REMOVE_head.o += $(CC_FLAGS_MARCH) -AFLAGS_head.o += $(CC_FLAGS_MARCH_MINIMUM) -AFLAGS_REMOVE_mem.o += $(CC_FLAGS_MARCH) -AFLAGS_mem.o += $(CC_FLAGS_MARCH_MINIMUM) -CFLAGS_REMOVE_als.o += $(CC_FLAGS_MARCH) -CFLAGS_als.o += $(CC_FLAGS_MARCH_MINIMUM) -CFLAGS_REMOVE_sclp_early_core.o += $(CC_FLAGS_MARCH) -CFLAGS_sclp_early_core.o += $(CC_FLAGS_MARCH_MINIMUM) -endif +KBUILD_AFLAGS := $(filter-out $(CC_FLAGS_MARCH),$(KBUILD_AFLAGS_DECOMPRESSOR)) +KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_MARCH),$(KBUILD_CFLAGS_DECOMPRESSOR)) +KBUILD_AFLAGS += $(CC_FLAGS_MARCH_MINIMUM) +KBUILD_CFLAGS += $(CC_FLAGS_MARCH_MINIMUM)
CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char