6.13-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jinghao Jia <jinghao7@xxxxxxxxxxxx>
[ Upstream commit 8b125949df58a00e8797c6e6d3f3d3dc08f4d939 ]
Commit 13b25489b6f8 ("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: 13b25489b6f8 ("kbuild: change working directory to external module directory with M=")
Tested-by: Ruowen Qin <ruqin@xxxxxxxxxx>
Suggested-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Suggested-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Signed-off-by: Jinghao Jia <jinghao7@xxxxxxxxxxxx>
Link: https://patch.msgid.link/20250203085506.220297-4-jinghao7@xxxxxxxxxxxx
Signed-off-by: Benjamin Tissoires <bentiss@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
samples/hid/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/samples/hid/Makefile b/samples/hid/Makefile
index 69159c81d0457..db5a077c77fc8 100644
--- a/samples/hid/Makefile
+++ b/samples/hid/Makefile
@@ -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)
--
2.39.5
