bpf: Remove custom build rule

According to the documentation, when building a kernel with the C=2
parameter, all source files should be checked. But this does not happen
for the kernel/bpf/ directory.

$ touch kernel/bpf/core.o
$ make C=2 CHECK=true kernel/bpf/core.o

Outputs:

  CHECK   scripts/mod/empty.c
  CALL    scripts/checksyscalls.sh
  DESCEND objtool
  INSTALL libsubcmd_headers
  CC      kernel/bpf/core.o

As can be seen the compilation is done, but CHECK is not executed. This
happens because kernel/bpf/Makefile has defined its own rule for
compilation and forgotten the macro that does the check.

There is no need to duplicate the build code, and this rule can be
removed to use generic rules.

Acked-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Oleg Nesterov <oleg@redhat.com>
Tested-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Alexey Gladkov <legion@kernel.org>
Link: https://lore.kernel.org/r/20240830074350.211308-1-legion@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexey Gladkov 2024-08-30 09:43:50 +02:00 committed by Alexei Starovoitov
parent 7c5f7b16fe
commit 1dd7622ef5
4 changed files with 6 additions and 6 deletions

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@ -52,9 +52,3 @@ obj-$(CONFIG_BPF_PRELOAD) += preload/
obj-$(CONFIG_BPF_SYSCALL) += relo_core.o
obj-$(CONFIG_BPF_SYSCALL) += btf_iter.o
obj-$(CONFIG_BPF_SYSCALL) += btf_relocate.o
# Some source files are common to libbpf.
vpath %.c $(srctree)/kernel/bpf:$(srctree)/tools/lib/bpf
$(obj)/%.o: %.c FORCE
$(call if_changed_rule,cc_o_c)

2
kernel/bpf/btf_iter.c Normal file
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@ -0,0 +1,2 @@
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
#include "../../tools/lib/bpf/btf_iter.c"

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@ -0,0 +1,2 @@
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
#include "../../tools/lib/bpf/btf_relocate.c"

2
kernel/bpf/relo_core.c Normal file
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@ -0,0 +1,2 @@
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
#include "../../tools/lib/bpf/relo_core.c"