From: Arnd Bergmann <arnd@arndb.de>
To: Martin Schwidefsky <schwidefsky@de.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>
Cc: clang-built-linux@googlegroups.com,
Nick Desaulniers <ndesaulniers@google.com>,
Nathan Chancellor <natechancellor@gmail.com>,
linux-s390@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Philipp Rudo <prudo@linux.vnet.ibm.com>,
Tony Krowiak <akrowiak@linux.ibm.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] s390: only build for new CPUs with clang
Date: Wed, 10 Apr 2019 22:12:40 +0200 [thread overview]
Message-ID: <20190410201300.3528984-1-arnd@arndb.de> (raw)
llvm does does not understand -march=z9-109 and older target
specifiers, so disable the respective Kconfig settings and
the logic to make the boot code work on old systems when
building with clang.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/s390/Kconfig | 6 ++++++
arch/s390/boot/Makefile | 2 ++
2 files changed, 8 insertions(+)
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 8cd860cba4d1..1a2eec61196d 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -240,6 +240,7 @@ choice
config MARCH_Z900
bool "IBM zSeries model z800 and z900"
+ depends on !CC_IS_CLANG
select HAVE_MARCH_Z900_FEATURES
help
Select this to enable optimizations for model z800/z900 (2064 and
@@ -248,6 +249,7 @@ config MARCH_Z900
config MARCH_Z990
bool "IBM zSeries model z890 and z990"
+ depends on !CC_IS_CLANG
select HAVE_MARCH_Z990_FEATURES
help
Select this to enable optimizations for model z890/z990 (2084 and
@@ -256,6 +258,7 @@ config MARCH_Z990
config MARCH_Z9_109
bool "IBM System z9"
+ depends on !CC_IS_CLANG
select HAVE_MARCH_Z9_109_FEATURES
help
Select this to enable optimizations for IBM System z9 (2094 and
@@ -347,12 +350,15 @@ config TUNE_DEFAULT
config TUNE_Z900
bool "IBM zSeries model z800 and z900"
+ depends on !CC_IS_CLANG
config TUNE_Z990
bool "IBM zSeries model z890 and z990"
+ depends on !CC_IS_CLANG
config TUNE_Z9_109
bool "IBM System z9"
+ depends on !CC_IS_CLANG
config TUNE_Z10
bool "IBM System z10"
diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile
index c844eaf24ed7..953a74d04990 100644
--- a/arch/s390/boot/Makefile
+++ b/arch/s390/boot/Makefile
@@ -11,6 +11,7 @@ KASAN_SANITIZE := n
KBUILD_AFLAGS := $(KBUILD_AFLAGS_DECOMPRESSOR)
KBUILD_CFLAGS := $(KBUILD_CFLAGS_DECOMPRESSOR)
+ifndef CONFIG_CC_IS_CLANG
#
# Use -march=z900 for als.c to be able to print an error
# message if the kernel is started on a machine which is too old
@@ -25,6 +26,7 @@ CFLAGS_als.o += -march=z900
CFLAGS_REMOVE_sclp_early_core.o += $(CC_FLAGS_MARCH)
CFLAGS_sclp_early_core.o += -march=z900
endif
+endif
CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char
--
2.20.0
next reply other threads:[~2019-04-10 20:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-10 20:12 Arnd Bergmann [this message]
2019-04-10 20:12 ` [PATCH 2/2] s390: boot, purgatory: pass $(CLANG_FLAGS) where needed Arnd Bergmann
2019-04-10 22:14 ` Nick Desaulniers
2019-04-11 8:52 ` Arnd Bergmann
2019-04-11 18:08 ` Nick Desaulniers
2019-04-15 6:32 ` Martin Schwidefsky
2019-04-10 22:20 ` [PATCH 1/2] s390: only build for new CPUs with clang Nick Desaulniers
2019-04-11 10:18 ` Arnd Bergmann
2019-04-11 17:46 ` Nick Desaulniers
2019-04-11 6:23 ` Heiko Carstens
2019-04-11 10:19 ` Arnd Bergmann
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