The runqslower build invokes a nested make, but the selected LLVM toolchain (via LLVM=-<version>) is not propagated. This causes the sub-make to call the system-default 'clang' and 'llvm-strip' even when a specific LLVM version is intended.

# LLVM=-20 V=1 make -C tools/testing/selftests/bpf ... make -C tools/bpf/runqslower ... clang -g -O2 --target=bpfel -I... -c runqslower.bpf.c -o runqslower.bpf.o && \ llvm-strip -g runqslower.bpf.o /bin/sh: 1: clang: not found

(expected: clang-20 and llvm-strip-20)

Propagate CLANG and LLVM_STRIP to the sub-make to ensure LLVM version consistency across all builds.

Signed-off-by: Hoyeon Lee hoyeon.lee@suse.com --- tools/testing/selftests/bpf/Makefile | 1 + tools/testing/selftests/lib.mk | 1 + 2 files changed, 2 insertions(+)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index 34ea23c63bd5..79ab69920dca 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -306,6 +306,7 @@ endif

$(OUTPUT)/runqslower: $(BPFOBJ) | $(DEFAULT_BPFTOOL) $(RUNQSLOWER_OUTPUT) $(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/runqslower \ + CLANG=$(CLANG) LLVM_STRIP=$(LLVM_STRIP) \ OUTPUT=$(RUNQSLOWER_OUTPUT) VMLINUX_BTF=$(VMLINUX_BTF) \ BPFTOOL_OUTPUT=$(HOST_BUILD_DIR)/bpftool/ \ BPFOBJ_OUTPUT=$(BUILD_DIR)/libbpf/ \ diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk index a448fae57831..f14255b2afbd 100644 --- a/tools/testing/selftests/lib.mk +++ b/tools/testing/selftests/lib.mk @@ -8,6 +8,7 @@ LLVM_SUFFIX := $(LLVM) endif

CLANG := $(LLVM_PREFIX)clang$(LLVM_SUFFIX) +LLVM_STRIP := $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)

CLANG_TARGET_FLAGS_arm := arm-linux-gnueabi CLANG_TARGET_FLAGS_arm64 := aarch64-linux-gnu