From 0ed3cc4abc10dc71f67a40e0c4b2c5c85e6aec82 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Fri, 7 Jun 2019 10:11:16 -0700 Subject: [PATCH] samples: bpf: don't run probes at the local make stage Quentin reports that commit 07c3bbdb1a9b ("samples: bpf: print a warning about headers_install") is producing the false positive when make is invoked locally, from the samples/bpf/ directory. When make is run locally it hits the "all" target, which will recursively invoke make through the full build system. Speed up the "local" run which doesn't actually build anything, and avoid false positives by skipping all the probes if not in kbuild environment (cover both the new warning and the BTF probes). Reported-by: Quentin Monnet Signed-off-by: Jakub Kicinski Reviewed-by: Quentin Monnet Signed-off-by: Alexei Starovoitov --- samples/bpf/Makefile | 3 +++ 1 file changed, 3 insertions(+) diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 4074a66..9eb5d73 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -206,6 +206,8 @@ HOSTCC = $(CROSS_COMPILE)gcc CLANG_ARCH_ARGS = -target $(ARCH) endif +# Don't evaluate probes and warnings if we need to run make recursively +ifneq ($(src),) HDR_PROBE := $(shell echo "\#include \n struct list_head { int a; }; int main() { return 0; }" | \ $(HOSTCC) $(KBUILD_HOSTCFLAGS) -x c - -o /dev/null 2>/dev/null && \ echo okay) @@ -232,6 +234,7 @@ ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),) DWARF2BTF = y endif endif +endif # Trick to allow make to be run from this directory all: -- 2.7.4