From: Ian Rogers <irogers@xxxxxxxxxx>
[ Upstream commit 5c45b210479bffe068d38902fcdcb52c4c60a264 ]
struct rq is defined in vmlinux.h when the vmlinux.h is generated,
this causes a redefinition failure if it is declared in
lock_contention.bpf.c. Move the definition to vmlinux.h for
consistency with the generated version.
Fixes: 760ebc45746b ("perf lock contention: Add empty 'struct rq' to satisfy libbpf 'runqueue' type verification")
Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: James Clark <james.clark@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Yang Jihong <yangjihong1@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: bpf@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20230623041405.4039475-3-irogers@xxxxxxxxxx
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
tools/perf/util/bpf_skel/lock_contention.bpf.c | 2 --
tools/perf/util/bpf_skel/vmlinux.h | 10 ++++++++++
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/bpf_skel/lock_contention.bpf.c b/tools/perf/util/bpf_skel/lock_contention.bpf.c
index 1d48226ae75d4..8d3cfbb3cc65b 100644
--- a/tools/perf/util/bpf_skel/lock_contention.bpf.c
+++ b/tools/perf/util/bpf_skel/lock_contention.bpf.c
@@ -416,8 +416,6 @@ int contention_end(u64 *ctx)
return 0;
}
-struct rq {};
-
extern struct rq runqueues __ksym;
struct rq___old {
diff --git a/tools/perf/util/bpf_skel/vmlinux.h b/tools/perf/util/bpf_skel/vmlinux.h
index c7ed51b0c1ef9..ab84a6e1da5ee 100644
--- a/tools/perf/util/bpf_skel/vmlinux.h
+++ b/tools/perf/util/bpf_skel/vmlinux.h
@@ -171,4 +171,14 @@ struct bpf_perf_event_data_kern {
struct perf_sample_data *data;
struct perf_event *event;
} __attribute__((preserve_access_index));
+
+/*
+ * If 'struct rq' isn't defined for lock_contention.bpf.c, for the sake of
+ * rq___old and rq___new, then the type for the 'runqueue' variable ends up
+ * being a forward declaration (BTF_KIND_FWD) while the kernel has it defined
+ * (BTF_KIND_STRUCT). The definition appears in vmlinux.h rather than
+ * lock_contention.bpf.c for consistency with a generated vmlinux.h.
+ */
+struct rq {};
+
#endif // __VMLINUX_H
--
2.39.2
