If generating vmlinux.h, make the code to generate it more tolerant by filtering out paths to kernels that lack a .BTF section. Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx> Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx> Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx> --- tools/perf/Makefile.perf | 29 ++++++++++++++++++++++++++--- 1 file changed, 26 insertions(+), 3 deletions(-) diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf index 80d772cc5fcb..8f442419a895 100644 --- a/tools/perf/Makefile.perf +++ b/tools/perf/Makefile.perf @@ -197,6 +197,7 @@ FLEX ?= flex BISON ?= bison STRIP = strip AWK = awk +READELF ?= readelf # include Makefile.config by default and rule out # non-config cases @@ -1084,12 +1085,34 @@ $(BPFTOOL): | $(SKEL_TMP_OUT) $(Q)CFLAGS= $(MAKE) -C ../bpf/bpftool \ OUTPUT=$(SKEL_TMP_OUT)/ bootstrap -VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \ +# Paths to search for a kernel to generate vmlinux.h from. +VMLINUX_BTF_ELF_PATHS ?= $(if $(O),$(O)/vmlinux) \ $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \ ../../vmlinux \ - /sys/kernel/btf/vmlinux \ /boot/vmlinux-$(shell uname -r) -VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS)))) + +# Paths to BTF information. +VMLINUX_BTF_BTF_PATHS ?= /sys/kernel/btf/vmlinux + +# Filter out kernels that don't exist or without a BTF section. +VMLINUX_BTF_ELF_ABSPATHS ?= $(abspath $(wildcard $(VMLINUX_BTF_ELF_PATHS))) +VMLINUX_BTF_PATHS ?= $(shell for file in $(VMLINUX_BTF_ELF_ABSPATHS); \ + do \ + if [ -f $$file ] && ($(READELF) -S "$$file" | grep -q .BTF); \ + then \ + echo "$$file"; \ + fi; \ + done) \ + $(wildcard $(VMLINUX_BTF_BTF_PATHS)) + +# Select the first as the source of vmlinux.h. +VMLINUX_BTF ?= $(firstword $(VMLINUX_BTF_PATHS)) + +ifeq ($(VMLINUX_H),) + ifeq ($(VMLINUX_BTF),) + $(error Missing bpftool input for generating vmlinux.h) + endif +endif $(SKEL_OUT)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) ifeq ($(VMLINUX_H),) -- 2.41.0.162.gfafddb0af9-goog
