[PATCH 5.14 392/432] parisc: Fix compile failure when building 64-bit kernel natively

Greg Kroah-Hartman
2021-09-16T17:46:53Z

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@gmx.de/#t
[2]: https://lore.kernel.org/linux-parisc/89515325-fc21-31da-d238-6f7a9abbf9a0@gmx.de/

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/)