netdev - [PATCH bpf-next] bpftoo: Support user defined vmlinux path

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Date:   Mon, 25 Apr 2022 15:57:24 +0800
From:   Jianlin Lv <iecedge@...il.com>
To:     bpf@...r.kernel.org
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kafai@...com, quentin@...valent.com, jean-philippe@...aro.org,
        mauricio@...volk.io, ytcoode@...il.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        jianlv@...y.com, Jianlin Lv <iecedge@...il.com>
Subject: [PATCH bpf-next] bpftoo: Support user defined vmlinux path

From: Jianlin Lv <iecedge@...il.com>

Add EXTERNAL_PATH variable that define unconventional vmlinux path

Signed-off-by: Jianlin Lv <iecedge@...il.com>
---
When building Ubuntu-5.15.0 kernel, '../../../vmlinux' cannot locate
compiled vmlinux image. Incorrect vmlinux generated vmlinux.h missing some
structure definitions that broken compiling pipe.
---
 tools/bpf/bpftool/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
index c6d2c77d0252..fefa3b763eb7 100644
--- a/tools/bpf/bpftool/Makefile
+++ b/tools/bpf/bpftool/Makefile
@@ -160,6 +160,7 @@ $(OBJS): $(LIBBPF) $(LIBBPF_INTERNAL_HDRS)
 VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux)				\
 		     $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)	\
 		     ../../../vmlinux					\
+		     $(if $(EXTERNAL_PATH),$(EXTERNAL_PATH)/vmlinux)	\
 		     /sys/kernel/btf/vmlinux				\
 		     /boot/vmlinux-$(shell uname -r)
 VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
-- 
2.25.1