This is a note to let you know that I've just added the patch titled s390/boot: Compile all files with the same march flag to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: s390-boot-compile-all-files-with-the-same-march-flag.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 4b0f0acc2dac743bf828a1095fa8239f15946482 Author: Heiko Carstens <hca@xxxxxxxxxxxxx> Date: Wed Sep 4 11:39:27 2024 +0200 s390/boot: Compile all files with the same march flag [ 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@xxxxxxxxxxxxx> Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile index 0ff9261c915e3..cba2705c62353 100644 --- a/arch/s390/boot/Makefile +++ b/arch/s390/boot/Makefile @@ -8,11 +8,8 @@ GCOV_PROFILE := n UBSAN_SANITIZE := n KASAN_SANITIZE := n -KBUILD_AFLAGS := $(KBUILD_AFLAGS_DECOMPRESSOR) -KBUILD_CFLAGS := $(KBUILD_CFLAGS_DECOMPRESSOR) - # -# Use minimum architecture for als.c to be able to print an error +# Use minimum architecture level so it is possible to print an error # message if the kernel is started on a machine which is too old # ifndef CONFIG_CC_IS_CLANG @@ -21,16 +18,10 @@ else CC_FLAGS_MARCH_MINIMUM := -march=z10 endif -ifneq ($(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