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samples/bpf: Add valid info for VMLINUX_BTF 

JIRA: https://issues.redhat.com/browse/RHEL-30773

commit 397658ddc88ce3c21d2aa3bed8e15fc69dfec946
Author: Tao Chen <chen.dylane@gmail.com>
Date:   Mon Apr 29 00:10:32 2024 +0800

    samples/bpf: Add valid info for VMLINUX_BTF
    
    When I use the command 'make M=samples/bpf' to compile samples/bpf code
    in ubuntu 22.04, the error info occured:
    Cannot find a vmlinux for VMLINUX_BTF at any of "  /home/ubuntu/code/linux/vmlinux",
    build the kernel or set VMLINUX_BTF or VMLINUX_H variable
    
    Others often encounter this kind of issue, new kernel has the vmlinux, so we can
    set the path in error info which seems more intuitive, like:
    Cannot find a vmlinux for VMLINUX_BTF at any of "  /home/ubuntu/code/linux/vmlinux",
    buiild the kernel or set VMLINUX_BTF like "VMLINUX_BTF=/sys/kernel/btf/vmlinux" or
    VMLINUX_H variable
    
    Signed-off-by: Tao Chen <chen.dylane@gmail.com>
    Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
    Link: https://lore.kernel.org/bpf/20240428161032.239043-1-chen.dylane@gmail.com

Signed-off-by: Viktor Malik <vmalik@redhat.com>
This commit is contained in:
Viktor Malik 2024-10-23 13:58:39 +02:00
parent 3d51549127
commit 61f52fb338
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1 changed files with 1 additions and 1 deletions
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samples/bpf/Makefile
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@ -371,7 +371,7 @@ $(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL)
ifeq ($(VMLINUX_H),)
ifeq ($(VMLINUX_BTF),)
$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)",\
build the kernel or set VMLINUX_BTF or VMLINUX_H variable)
build the kernel or set VMLINUX_BTF like "VMLINUX_BTF=/sys/kernel/btf/vmlinux" or VMLINUX_H variable)
endif
$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
else