linux-kernel - Re: [PATCH v4 bpf-next 5/6] bpf: runqslower: prefer using local vmlimux to generate vmlinux.h

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Message-ID: <CAEf4BzZ5r7OJyhzoOY=UZyf29GCfLodauNxZzfN+2OkOSxgBzw@mail.gmail.com>
Date:   Mon, 22 Feb 2021 22:26:58 -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>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        Peter Ziljstra <peterz@...radead.org>
Subject: Re: [PATCH v4 bpf-next 5/6] bpf: runqslower: prefer using local
 vmlimux to generate vmlinux.h

On Mon, Feb 22, 2021 at 5:24 PM Song Liu <songliubraving@...com> wrote:
>
> Update the Makefile to prefer using $(O)/mvlinux, $(KBUILD_OUTPUT)/vmlinux
> (for selftests) or ../../../vmlinux. These two files should have latest
> definitions for vmlinux.h.
>
> Signed-off-by: Song Liu <songliubraving@...com>
> ---

Acked-by: Andrii Nakryiko <andrii@...nel.org>

>  tools/bpf/runqslower/Makefile | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/tools/bpf/runqslower/Makefile b/tools/bpf/runqslower/Makefile
> index 9d9fb6209be1b..c96ba90c6f018 100644
> --- a/tools/bpf/runqslower/Makefile
> +++ b/tools/bpf/runqslower/Makefile
> @@ -16,7 +16,10 @@ 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 $(O),$(O)/vmlinux)           \
> +       $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
> +       ../../../vmlinux /sys/kernel/btf/vmlinux        \
> +       /boot/vmlinux-$(KERNEL_REL)
>  VMLINUX_BTF_PATH := $(or $(VMLINUX_BTF),$(firstword                           \
>                                           $(wildcard $(VMLINUX_BTF_PATHS))))
>
> --
> 2.24.1
>