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| author | Toke Høiland-Jørgensen <toke@redhat.com> | 2020-01-20 14:06:42 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-01-20 16:37:45 -0800 |
| commit | a835d38d41ca4f8eab5f97512446212f42f094a1 (patch) | |
| tree | a496cdc61b86d0f35995799dc75c6a69084f974a /tools | |
| parent | b2e5e93ae8af6a34bca536cdc4b453ab1e707b8b (diff) | |
| download | linux-a835d38d41ca4f8eab5f97512446212f42f094a1.tar.bz2 | |
tools/bpf/runqslower: Fix override option for VMLINUX_BTF
The runqslower tool refuses to build without a file to read vmlinux BTF
from. The build fails with an error message to override the location by
setting the VMLINUX_BTF variable if autodetection fails. However, the
Makefile doesn't actually work with that override - the error message is
still emitted.
Fix this by including the value of VMLINUX_BTF in the expansion, and only
emitting the error message if the *result* is empty. Also permit running
'make clean' even though no VMLINUX_BTF is set.
Fixes: 9c01546d26d2 ("tools/bpf: Add runqslower tool to tools/bpf")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157952560237.1683545.17771785178857224877.stgit@toke.dk
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/bpf/runqslower/Makefile | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/tools/bpf/runqslower/Makefile b/tools/bpf/runqslower/Makefile index cff2fbcd29a8..3242ab874ac0 100644 --- a/tools/bpf/runqslower/Makefile +++ b/tools/bpf/runqslower/Makefile @@ -10,13 +10,9 @@ CFLAGS := -g -Wall # Try to detect best kernel BTF source KERNEL_REL := $(shell uname -r) -ifneq ("$(wildcard /sys/kernel/btf/vmlinux)","") -VMLINUX_BTF := /sys/kernel/btf/vmlinux -else ifneq ("$(wildcard /boot/vmlinux-$(KERNEL_REL))","") -VMLINUX_BTF := /boot/vmlinux-$(KERNEL_REL) -else -$(error "Can't detect kernel BTF, use VMLINUX_BTF to specify it explicitly") -endif +VMLINUX_BTF_PATHS := /sys/kernel/btf/vmlinux /boot/vmlinux-$(KERNEL_REL) +VMLINUX_BTF_PATH := $(or $(VMLINUX_BTF),$(firstword \ + $(wildcard $(VMLINUX_BTF_PATHS)))) abs_out := $(abspath $(OUTPUT)) ifeq ($(V),1) @@ -67,9 +63,14 @@ $(OUTPUT): $(call msg,MKDIR,$@) $(Q)mkdir -p $(OUTPUT) -$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF) | $(OUTPUT) $(BPFTOOL) +$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF_PATH) | $(OUTPUT) $(BPFTOOL) $(call msg,GEN,$@) - $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@ + $(Q)if [ ! -e "$(VMLINUX_BTF_PATH)" ] ; then \ + echo "Couldn't find kernel BTF; set VMLINUX_BTF to" \ + "specify its location." >&2; \ + exit 1;\ + fi + $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF_PATH) format c > $@ $(OUTPUT)/libbpf.a: | $(OUTPUT) $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \ |