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samples/hid: fix broken vmlinux path for VMLINUX_BTF

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Commit 13b25489b6 ("kbuild: change working directory to external
module directory with M=") changed kbuild working directory of hid-bpf
sample programs to samples/hid, which broke the vmlinux path for
VMLINUX_BTF, as the Makefiles assume the current work directory to be
the kernel output directory and use a relative path (i.e., ./vmlinux):

  Makefile:173: *** Cannot find a vmlinux for VMLINUX_BTF at any of "  /path/to/linux/samples/hid/vmlinux", build the kernel or set VMLINUX_BTF or VMLINUX_H variable.  Stop.

Correctly refer to the kernel output directory using $(objtree).

Fixes: 13b25489b6 ("kbuild: change working directory to external module directory with M=")
Tested-by: Ruowen Qin <ruqin@redhat.com>
Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jinghao Jia <jinghao7@illinois.edu>
Link: https://patch.msgid.link/20250203085506.220297-4-jinghao7@illinois.edu
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This commit is contained in:
Jinghao Jia 2025-02-03 02:55:06 -06:00 • committed by Benjamin Tissoires
parent 1739cafdb8
commit 8b125949df
1 changed files with 1 additions and 1 deletions
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2
samples/hid/Makefile
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@ -164,7 +164,7 @@ $(obj)/hid_surface_dial.o: $(obj)/hid_surface_dial.skel.h
VMLINUX_BTF_PATHS ?= $(abspath $(if $(O),$(O)/vmlinux)) \
$(abspath $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)) \
$(abspath ./vmlinux)
$(abspath $(objtree)/vmlinux)
VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
$(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL)