linux-kernel - [bpf-next] selftests/bpf: propagate LLVM toolchain into runqslower sub-make

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Message-ID: <20251119043739.1860428-1-hoyeon.lee@suse.com>
Date: Wed, 19 Nov 2025 13:37:39 +0900
From: Hoyeon Lee <hoyeon.lee@...e.com>
To: bpf@...r.kernel.org
Cc: Hoyeon Lee <hoyeon.lee@...e.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [bpf-next] selftests/bpf: propagate LLVM toolchain into runqslower sub-make

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@...e.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
-- 
2.51.1