[PATCH 38/44] perf bpf: Add wrappers to BPF_FUNC_probe_read(_str) functions

From: Arnaldo Carvalho de Melo
Date: Thu Aug 09 2018 - 11:01:40 EST

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

Will be used shortly in the augmented syscalls work together with a
PERF_COUNT_SW_BPF_OUTPUT software event to insert syscalls + pointer
contents in the perf ring buffer, to be consumed by 'perf trace'

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: https://lkml.kernel.org/n/tip-ajlkpz4cd688ulx1u30htkj3@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
tools/perf/include/bpf/bpf.h | 3 +++
1 file changed, 3 insertions(+)

diff --git a/tools/perf/include/bpf/bpf.h b/tools/perf/include/bpf/bpf.h
index 1f632b56bb34..47897d65e799 100644
--- a/tools/perf/include/bpf/bpf.h
+++ b/tools/perf/include/bpf/bpf.h
@@ -30,4 +30,7 @@ struct bpf_map {
char _license[] SEC("license") = #name; \
int _version SEC("version") = LINUX_VERSION_CODE;

+static int (*probe_read)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read;
+static int (*probe_read_str)(void *dst, int size, const void *unsafe_addr) = (void *)BPF_FUNC_probe_read_str;
#endif /* _PERF_BPF_H */