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authorAndrii Nakryiko <andriin@fb.com>2020-03-01 02:11:09 +0300
committerAlexei Starovoitov <ast@kernel.org>2020-03-03 03:25:14 +0300
commitca7dc2791b507f842d73e46b1a0453b36b69ffc2 (patch)
treeb68bae67d0fbce7f668f33eed823ddb2efa777f5 /tools
parent15070919f801348e9a9a2ea96f427d8b621f3cd5 (diff)
downloadlinux-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')
-rw-r--r--tools/bpf/bpftool/btf.c5
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);