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Groups > linux.kernel > #1274630 > unrolled thread
| Started by | Heiko Carstens <heiko.carstens@de.ibm.com> |
|---|---|
| First post | 2015-11-21 12:10 +0100 |
| Last post | 2015-11-21 12:10 +0100 |
| Articles | 2 — 1 participant |
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[PATCH 0/2] kbuild: add AFLAGS_REMOVE Heiko Carstens <heiko.carstens@de.ibm.com> - 2015-11-21 12:10 +0100
[PATCH 2/2] s390: compile head.s always with -march=z900 Heiko Carstens <heiko.carstens@de.ibm.com> - 2015-11-21 12:10 +0100
| From | Heiko Carstens <heiko.carstens@de.ibm.com> |
|---|---|
| Date | 2015-11-21 12:10 +0100 |
| Subject | [PATCH 0/2] kbuild: add AFLAGS_REMOVE |
| Message-ID | <qxedj-4tu-5@gated-at.bofh.it> |
Hi Michal, these are just two simple patches which add 1) an AFLAGS_REMOVE option which works just like CFLAGS_REMOVE and 2) one user of it in s390 code. If you agree this is ok, then these two patches could go upstream either via your tree or the s390 tree. Thanks, Heiko Heiko Carstens (2): kbuild: add AFLAGS_REMOVE_(basename).o option s390: compile head.s always with -march=z900 arch/s390/kernel/Makefile | 6 ++++-- scripts/Makefile.lib | 3 ++- 2 files changed, 6 insertions(+), 3 deletions(-) -- 2.3.9 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Heiko Carstens <heiko.carstens@de.ibm.com> |
|---|---|
| Date | 2015-11-21 12:10 +0100 |
| Subject | [PATCH 2/2] s390: compile head.s always with -march=z900 |
| Message-ID | <qxedj-4tu-7@gated-at.bofh.it> |
| In reply to | #1274630 |
head.s on s390 contains some sanity checks if the kernel will run on a machine or if the machine is too old, e.g. if the kernel contains instructions not available on the machine. If so, it will emit an error message to the console before it stops execution. Therefore head.s contains only instructions which are availanble with the earliest machine generation (z900). In order to make sure we don't accidently add instructions which are not available on z900, always compile with -march=z900. This makes sure compilation will fail if wrong instructions are used. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> --- arch/s390/kernel/Makefile | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile index dc167a23b920..a53755e37e3d 100644 --- a/arch/s390/kernel/Makefile +++ b/arch/s390/kernel/Makefile @@ -34,8 +34,10 @@ CFLAGS_sysinfo.o += -w # CFLAGS_REMOVE_sclp.o = $(CC_FLAGS_FTRACE) ifneq ($(CC_FLAGS_MARCH),-march=z900) -CFLAGS_REMOVE_sclp.o += $(CC_FLAGS_MARCH) -CFLAGS_sclp.o += -march=z900 +CFLAGS_REMOVE_sclp.o += $(CC_FLAGS_MARCH) +CFLAGS_sclp.o += -march=z900 +AFLAGS_REMOVE_head.o += $(CC_FLAGS_MARCH) +AFLAGS_head.o += -march=z900 endif GCOV_PROFILE_sclp.o := n -- 2.3.9 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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