linux-kernel - [RFC PATCH 05/10] perf workqueue: add sparse annotation header

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Date:   Tue, 13 Jul 2021 14:11:16 +0200
From:   Riccardo Mancini <rickyman7@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Riccardo Mancini <rickyman7@...il.com>
Subject: [RFC PATCH 05/10] perf workqueue: add sparse annotation header

This patch adds a simple header containing sparse annotations.

TODO: what is the best place to put this?

Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
---
 tools/perf/util/workqueue/sparse.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 tools/perf/util/workqueue/sparse.h

diff --git a/tools/perf/util/workqueue/sparse.h b/tools/perf/util/workqueue/sparse.h
new file mode 100644
index 0000000000000000..644f6db8f050ab50
--- /dev/null
+++ b/tools/perf/util/workqueue/sparse.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __WORKQUEUE_SPARSE_H
+#define __WORKQUEUE_SPARSE_H
+
+#ifdef __CHECKER__
+# define __must_hold(x)		__attribute__((context(x, 1, 1)))
+# define __acquires(x)		__attribute__((context(x, 0, 1)))
+# define __releases(x)		__attribute__((context(x, 1, 0)))
+# define __acquire(x)		__context__(x, 1)
+# define __release(x)		__context__(x, -1)
+# define __cond_lock(x, c)	((c) ? ({ __acquire(x); 1; }) : 0)
+#else
+# define __must_hold(x)
+# define __acquires(x)
+# define __releases(x)
+# define __acquire(x)		((void)0)
+# define __release(x)		((void)0)
+# define __cond_lock(x, c)	(c)
+#endif
+
+#endif /* __WORKQUEUE_SPARSE_H */
-- 
2.31.1