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| author | Andrii Nakryiko <andriin@fb.com> | 2020-03-01 02:11:09 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-03-03 03:25:14 +0300 |
| commit | ca7dc2791b507f842d73e46b1a0453b36b69ffc2 (patch) | |
| tree | b68bae67d0fbce7f668f33eed823ddb2efa777f5 /tools/bpf/bpftool/btf.c | |
| parent | 15070919f801348e9a9a2ea96f427d8b621f3cd5 (diff) | |
| download | linux-ca7dc2791b507f842d73e46b1a0453b36b69ffc2.tar.xz | |
bpftool: Add header guards to generated vmlinux.h
Add canonical #ifndef/#define/#endif guard for generated vmlinux.h header with
__VMLINUX_H__ symbol. __VMLINUX_H__ is also going to play double role of
identifying whether vmlinux.h is being used, versus, say, BCC or non-CO-RE
libbpf modes with dependency on kernel headers. This will make it possible to
write helper macro/functions, agnostic to exact BPF program set up.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200229231112.1240137-2-andriin@fb.com
Diffstat (limited to 'tools/bpf/bpftool/btf.c')
| -rw-r--r-- | tools/bpf/bpftool/btf.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c index b3745ed711ba..bcaf55b59498 100644 --- a/tools/bpf/bpftool/btf.c +++ b/tools/bpf/bpftool/btf.c @@ -389,6 +389,9 @@ static int dump_btf_c(const struct btf *btf, if (IS_ERR(d)) return PTR_ERR(d); + printf("#ifndef __VMLINUX_H__\n"); + printf("#define __VMLINUX_H__\n"); + printf("\n"); printf("#ifndef BPF_NO_PRESERVE_ACCESS_INDEX\n"); printf("#pragma clang attribute push (__attribute__((preserve_access_index)), apply_to = record)\n"); printf("#endif\n\n"); @@ -412,6 +415,8 @@ static int dump_btf_c(const struct btf *btf, printf("#ifndef BPF_NO_PRESERVE_ACCESS_INDEX\n"); printf("#pragma clang attribute pop\n"); printf("#endif\n"); + printf("\n"); + printf("#endif /* __VMLINUX_H__ */\n"); done: btf_dump__free(d); |