From: Ian Rogers <irogers@google.com>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
James Clark <james.clark@arm.com>,
Tiezhu Yang <yangtiezhu@loongson.cn>,
Yang Jihong <yangjihong1@huawei.com>,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org
Cc: Andrii Nakryiko <andrii@kernel.org>
Subject: [PATCH v3 2/4] perf bpf: Move the declaration of struct rq
Date: Thu, 8 Jun 2023 21:32:38 -0700 [thread overview]
Message-ID: <20230609043240.43890-3-irogers@google.com> (raw)
In-Reply-To: <20230609043240.43890-1-irogers@google.com>
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@google.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
---
tools/perf/util/bpf_skel/lock_contention.bpf.c | 2 --
tools/perf/util/bpf_skel/vmlinux/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 1d48226ae75d..8d3cfbb3cc65 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/vmlinux.h b/tools/perf/util/bpf_skel/vmlinux/vmlinux.h
index c7ed51b0c1ef..ab84a6e1da5e 100644
--- a/tools/perf/util/bpf_skel/vmlinux/vmlinux.h
+++ b/tools/perf/util/bpf_skel/vmlinux/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
--
2.41.0.162.gfafddb0af9-goog
next prev parent reply other threads:[~2023-06-09 4:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-09 4:32 [PATCH v3 0/4] Bring back vmlinux.h generation Ian Rogers
2023-06-09 4:32 ` [PATCH v3 1/4] perf build: Add ability to build with a generated vmlinux.h Ian Rogers
2023-06-09 4:32 ` Ian Rogers [this message]
2023-06-09 4:32 ` [PATCH v3 3/4] perf test: Add build tests for BUILD_BPF_SKEL Ian Rogers
2023-06-09 4:32 ` [PATCH v3 4/4] perf build: Filter out BTF sources without a .BTF section Ian Rogers
2023-06-09 6:34 ` [PATCH v3 0/4] Bring back vmlinux.h generation Namhyung Kim
2023-06-10 22:14 ` Jiri Olsa
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230609043240.43890-3-irogers@google.com \
--to=irogers@google.com \
--cc=acme@kernel.org \
--cc=adrian.hunter@intel.com \
--cc=alexander.shishkin@linux.intel.com \
--cc=andrii@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=james.clark@arm.com \
--cc=jolsa@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-perf-users@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=mingo@redhat.com \
--cc=namhyung@kernel.org \
--cc=peterz@infradead.org \
--cc=yangjihong1@huawei.com \
--cc=yangtiezhu@loongson.cn \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).