From: Masahiro Yamada masahiroy@kernel.org
commit 5f6e0fe01b6b33894cf6f61b359ab5a6d2b7674e upstream.
Commit 23243c1ace9f ("arch: use cross_compiling to check whether it is a cross build or not") broke 64-bit parisc builds on 32-bit parisc systems.
Helge mentioned: - 64-bit parisc userspace is not supported yet [1] - hppa gcc does not support "-m64" flag [2]
That means, parisc developers working on a 32-bit parisc machine need to use hppa64-linux-gnu-gcc (cross compiler) for building the 64-bit parisc kernel.
After the offending commit, gcc is used in such a case because both $(SRCARCH) and $(SUBARCH) are 'parisc', hence cross_compiling is unset.
A correct way is to introduce ARCH=parisc64 because building the 64-bit parisc kernel on a 32-bit parisc system is not exactly a native build, but rather a semi-cross build.
[1]: https://lore.kernel.org/linux-parisc/5dfd81eb-c8ca-b7f5-e80e-8632767c022d@gm... [2]: https://lore.kernel.org/linux-parisc/89515325-fc21-31da-d238-6f7a9abbf9a0@gm...
Fixes: 23243c1ace9f ("arch: use cross_compiling to check whether it is a cross build or not") Signed-off-by: Masahiro Yamada masahiroy@kernel.org Reported-by: Meelis Roos mroos@linux.ee Tested-by: Meelis Roos mroos@linux.ee Cc: stable@vger.kernel.org # v5.13+ Signed-off-by: Helge Deller deller@gmx.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- Makefile | 5 +++++ arch/parisc/Makefile | 6 +++--- scripts/subarch.include | 2 +- 3 files changed, 9 insertions(+), 4 deletions(-)
--- a/Makefile +++ b/Makefile @@ -404,6 +404,11 @@ ifeq ($(ARCH),sparc64) SRCARCH := sparc endif
+# Additional ARCH settings for parisc +ifeq ($(ARCH),parisc64) + SRCARCH := parisc +endif + export cross_compiling := ifneq ($(SRCARCH),$(SUBARCH)) cross_compiling := 1 --- a/arch/parisc/Makefile +++ b/arch/parisc/Makefile @@ -25,18 +25,18 @@ CHECKFLAGS += -D__hppa__=1 ifdef CONFIG_64BIT UTS_MACHINE := parisc64 CHECKFLAGS += -D__LP64__=1 -CC_ARCHES = hppa64 LD_BFD := elf64-hppa-linux else # 32-bit -CC_ARCHES = hppa hppa2.0 hppa1.1 LD_BFD := elf32-hppa-linux endif
# select defconfig based on actual architecture -ifeq ($(shell uname -m),parisc64) +ifeq ($(ARCH),parisc64) KBUILD_DEFCONFIG := generic-64bit_defconfig + CC_ARCHES := hppa64 else KBUILD_DEFCONFIG := generic-32bit_defconfig + CC_ARCHES := hppa hppa2.0 hppa1.1 endif
export LD_BFD --- a/scripts/subarch.include +++ b/scripts/subarch.include @@ -7,7 +7,7 @@ SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ -e s/sun4u/sparc64/ \ -e s/arm.*/arm/ -e s/sa110/arm/ \ - -e s/s390x/s390/ -e s/parisc64/parisc/ \ + -e s/s390x/s390/ \ -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ -e s/riscv.*/riscv/)