linux-kernel - Re: [PATCH v2 bpf-next 3/4] bpf: runqslower: prefer use local KBUILD

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Date:   Wed, 27 Jan 2021 13:22:44 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Ziljstra <peterz@...radead.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Kernel Team <kernel-team@...com>, Hao Luo <haoluo@...gle.com>
Subject: Re: [PATCH v2 bpf-next 3/4] bpf: runqslower: prefer use local
 KBUILD_OUTPUT/vmlinux or vmlinux

On Tue, Jan 26, 2021 at 1:11 AM Song Liu <songliubraving@...com> wrote:
>
> Update the Makefile to prefer using KBUILD_OUTPUT/vmlinux (for selftests)
> or ../../../vmlinux. These two files should have latest definitions for
> vmlinux.h.
>
> Signed-off-by: Song Liu <songliubraving@...com>
> ---
>  tools/bpf/runqslower/Makefile | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/tools/bpf/runqslower/Makefile b/tools/bpf/runqslower/Makefile
> index 4d5ca54fcd4c8..1f75c95d4d023 100644
> --- a/tools/bpf/runqslower/Makefile
> +++ b/tools/bpf/runqslower/Makefile
> @@ -19,7 +19,9 @@ CFLAGS := -g -Wall
>
>  # Try to detect best kernel BTF source
>  KERNEL_REL := $(shell uname -r)
> -VMLINUX_BTF_PATHS := /sys/kernel/btf/vmlinux /boot/vmlinux-$(KERNEL_REL)
> +VMLINUX_BTF_PATHS := $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \

O= overrides KBUILD_OUTPUT=, so please handle it first. See
selftests/bpf/Makefile.

> +       ../../../vmlinux /sys/kernel/btf/vmlinux \
> +       /boot/vmlinux-$(KERNEL_REL)
>  VMLINUX_BTF_PATH := $(or $(VMLINUX_BTF),$(firstword                           \
>                                           $(wildcard $(VMLINUX_BTF_PATHS))))
>
> --
> 2.24.1
>