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Date: Wed, 15 Jan 2020 08:59:15 -0800 From: Andrii Nakryiko <andrii.nakryiko@...il.com> To: Toke Høiland-Jørgensen <toke@...hat.com> Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, Andrii Nakryiko <andriin@...com>, Doug Ledford <dledford@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <jakub.kicinski@...ronome.com>, Jesper Dangaard Brouer <brouer@...hat.com>, John Fastabend <john.fastabend@...il.com>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>, Shuah Khan <shuah@...nel.org>, Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>, linux-rdma@...r.kernel.org, "open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, clang-built-linux@...glegroups.com Subject: Re: [PATCH bpf-next v2 02/10] tools/bpf/runqslower: Fix override option for VMLINUX_BTF On Wed, Jan 15, 2020 at 6:13 AM Toke Høiland-Jørgensen <toke@...hat.com> wrote: > > From: Toke Høiland-Jørgensen <toke@...hat.com> > > 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. Do you have example command with VMLINUX_BTF override that didn't work (and what error message was emitted)? > > Fix this by only doing auto-detection if no override is set. And while > we're at it, also look for a vmlinux file in the current kernel build dir > if none if found on the running kernel. > > Fixes: 9c01546d26d2 ("tools/bpf: Add runqslower tool to tools/bpf") > Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com> > --- > tools/bpf/runqslower/Makefile | 16 ++++++++++------ > 1 file changed, 10 insertions(+), 6 deletions(-) > > diff --git a/tools/bpf/runqslower/Makefile b/tools/bpf/runqslower/Makefile > index cff2fbcd29a8..fb93ce2bf2fe 100644 > --- a/tools/bpf/runqslower/Makefile > +++ b/tools/bpf/runqslower/Makefile > @@ -10,12 +10,16 @@ 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") > +ifeq ("$(VMLINUX_BTF)","") > + ifneq ("$(wildcard /sys/kernel/btf/vmlinux)","") > + VMLINUX_BTF := /sys/kernel/btf/vmlinux > + else ifneq ("$(wildcard /boot/vmlinux-$(KERNEL_REL))","") > + VMLINUX_BTF := /boot/vmlinux-$(KERNEL_REL) > + else ifneq ("$(wildcard $(abspath ../../../vmlinux))","") > + VMLINUX_BTF := $(abspath ../../../vmlinux) I'm planning to mirror runqslower into libbpf Github repo and this ../../../vmlinux piece will be completely out of place in that context. Also it only will help when building kernel in-tree. So I'd rather not add this. > + else > + $(error "Can't detect kernel BTF, use VMLINUX_BTF to specify it explicitly") > + endif > endif > > abs_out := $(abspath $(OUTPUT)) >
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