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s390/boot: Compile all files with the same march flag

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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>
This commit is contained in:
Heiko Carstens
2024-09-04 11:39:27 +02:00
parent ebcc369f18
commit fccb175bc8
1 changed files with 5 additions and 14 deletions
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19
arch/s390/boot/Makefile
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@@ -11,25 +11,16 @@ KASAN_SANITIZE := n
KCSAN_SANITIZE := n
KMSAN_SANITIZE := n
KBUILD_AFLAGS := $(KBUILD_AFLAGS_DECOMPRESSOR)
KBUILD_CFLAGS := $(KBUILD_CFLAGS_DECOMPRESSOR)
#
# Use minimum architecture for als.c to be able to print an error
# Use minimum architecture level so it is possible to print an error
# message if the kernel is started on a machine which is too old
#
CC_FLAGS_MARCH_MINIMUM := -march=z10
ifneq ($(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