[PATCH bpf v2 0/2] Makefile fixes for samples/{bpf,hid}

[Jinghao Jia]

Hi everyone,

Following commit 13b25489b6f8 ("kbuild: change working directory to
external module directory with M="), the Makefiles for both bpf and hid
samples are broken due to the use of the relative vmlinux path (i.e.,
./vmlinux) when generating vmlinux.h. Additionally, samples/hid experience
the same problem that was fixed for samples/bpf in commit 5a6ea7022ff4
("samples/bpf: Remove unnecessary -I flags from libbpf EXTRA_CFLAGS").

This patchset makes the following changes to fix these two problems:
 - It applies the same fix from commit 5a6ea7022ff4 ("samples/bpf: Remove
   unnecessary -I flags from libbpf EXTRA_CFLAGS") to samples/hid.
 - It replaces the relative vmlinux paths in samples/{bpf,hid}/Makefile
   with $(objtree)/vmlinux to correctly refer to the kernel output
   directory and vmlinux, following the recent working directory change in
   kbuild.

Changelog:
v1 -> v2:
 - v1: https://lore.kernel.org/all/20250120023027.160448-1-jinghao7@xxxxxxxxxxxx/
 - Address feedback from Daniel
  - Apply vmlinux path fix to samples/hid
  - Add a second patch that fixes the include path issue in samples/hid,
    i.e., the same issue fixed fpr samples/bpf in commit 5a6ea7022ff4
    ("samples/bpf: Remove unnecessary -I flags from libbpf EXTRA_CFLAGS").
 - Address feedback from Masahiro and Nicolas
   - Use $(objtree) instead of $(srctree) in the path when referring to
     vmlinux, as it is an artifact of kbuild.

Jinghao Jia (2):
  samples/hid: remove unnecessary -I flags from libbpf EXTRA_CFLAGS
  samples/{bpf,hid}: fix broken vmlinux path for VMLINUX_BTF

 samples/bpf/Makefile |  2 +-
 samples/hid/Makefile | 13 +++++++------
 2 files changed, 8 insertions(+), 7 deletions(-)

-- 
2.48.1