On Wed, Jun 14, 2023 at 5:19 PM Mark Brown broonie@kernel.org wrote:

Currently the MM selftests attempt to work out the target architecture by using CROSS_COMPILE or otherwise querying the host machine, storing the target architecture in a variable called MACHINE rather than the usual ARCH though as far as I can tell (including for x86_64) the value is the same as we would use for architecture.

When cross compiling with LLVM we don't need a CROSS_COMPILE as LLVM can support many target architectures in a single build so this logic does not work, CROSS_COMPILE is not set and we end up selecting tests for the host rather than target architecture. Fix this by using the more standard ARCH to describe the architecture, taking it from the environment if specified.

Signed-off-by: Mark Brown broonie@kernel.org

Broonie, Thanks for the patch! What's the best way to test this?

$ ARCH=arm64 make LLVM=1 -j128 -C tools/testing/selfte sts/mm/

Is what I would have guessed, but I get errors with or without this patch.

Also, fwiw, b4 shows that you don't have a pgp key setup for broonie@kernel.org; I don't think it matters, but maybe it's a surprise to you if you thought you had set that up, $ b4 shazam https://lore.kernel.org/llvm/20230614-kselftest-mm-llvm-v1-1-180523f277d3@ke... ... ✗ No key: openpgp/broonie@kernel.org

---

tools/testing/selftests/mm/Makefile | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile index 23af4633f0f4..4f0c50c33ba7 100644 --- a/tools/testing/selftests/mm/Makefile +++ b/tools/testing/selftests/mm/Makefile @@ -5,12 +5,15 @@ LOCAL_HDRS += $(selfdir)/mm/local_config.h $(top_srcdir)/mm/gup_test.h

include local_config.mk

+ifeq ($(ARCH),)

ifeq ($(CROSS_COMPILE),) uname_M := $(shell uname -m 2>/dev/null || echo not) else uname_M := $(shell echo $(CROSS_COMPILE) | grep -o '^[a-z0-9]+') endif -MACHINE ?= $(shell echo $(uname_M) | sed -e 's/aarch64.*/arm64/' -e 's/ppc64.*/ppc64/') +ARCH ?= $(shell echo $(uname_M) | sed -e 's/aarch64.*/arm64/' -e 's/ppc64.*/ppc64/') +endif

# Without this, failed build products remain, with up-to-date timestamps, # thus tricking Make (and you!) into believing that All Is Well, in subsequent @@ -65,7 +68,7 @@ TEST_GEN_PROGS += ksm_tests TEST_GEN_PROGS += ksm_functional_tests TEST_GEN_PROGS += mdwe_test

-ifeq ($(MACHINE),x86_64) +ifeq ($(ARCH),x86_64) CAN_BUILD_I386 := $(shell ./../x86/check_cc.sh "$(CC)" ../x86/trivial_32bit_program.c -m32) CAN_BUILD_X86_64 := $(shell ./../x86/check_cc.sh "$(CC)" ../x86/trivial_64bit_program.c) CAN_BUILD_WITH_NOPIE := $(shell ./../x86/check_cc.sh "$(CC)" ../x86/trivial_program.c -no-pie) @@ -87,13 +90,13 @@ TEST_GEN_PROGS += $(BINARIES_64) endif else

-ifneq (,$(findstring $(MACHINE),ppc64)) +ifneq (,$(findstring $(ARCH),ppc64)) TEST_GEN_PROGS += protection_keys endif

endif

-ifneq (,$(filter $(MACHINE),arm64 ia64 mips64 parisc64 ppc64 riscv64 s390x sparc64 x86_64)) +ifneq (,$(filter $(ARCH),arm64 ia64 mips64 parisc64 ppc64 riscv64 s390x sparc64 x86_64)) TEST_GEN_PROGS += va_high_addr_switch TEST_GEN_PROGS += virtual_address_range TEST_GEN_PROGS += write_to_hugetlbfs @@ -112,7 +115,7 @@ $(TEST_GEN_PROGS): vm_util.c $(OUTPUT)/uffd-stress: uffd-common.c $(OUTPUT)/uffd-unit-tests: uffd-common.c

-ifeq ($(MACHINE),x86_64) +ifeq ($(ARCH),x86_64) BINARIES_32 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_32)) BINARIES_64 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_64))

---

base-commit: 858fd168a95c5b9669aac8db6c14a9aeab446375 change-id: 20230614-kselftest-mm-llvm-a25a7daffa6f

Best regards,

Mark Brown broonie@kernel.org