linux-kernel - [PATCH v3 07/25] kcsan: Call scoped accesses reordered in reports

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Date:   Tue, 30 Nov 2021 12:44:15 +0100
From:   Marco Elver <elver@...gle.com>
To:     elver@...gle.com, "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Waiman Long <longman@...hat.com>,
        Will Deacon <will@...nel.org>, kasan-dev@...glegroups.com,
        linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, llvm@...ts.linux.dev, x86@...nel.org
Subject: [PATCH v3 07/25] kcsan: Call scoped accesses reordered in reports

The scoping of an access simply denotes the scope in which it may be
reordered. However, in reports, it'll be less confusing to say the
access is "reordered". This is more accurate when the race occurred.

Signed-off-by: Marco Elver <elver@...gle.com>
---
 kernel/kcsan/kcsan_test.c |  4 ++--
 kernel/kcsan/report.c     | 16 ++++++++--------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/kernel/kcsan/kcsan_test.c b/kernel/kcsan/kcsan_test.c
index 660729238588..6e3c2b8bc608 100644
--- a/kernel/kcsan/kcsan_test.c
+++ b/kernel/kcsan/kcsan_test.c
@@ -213,9 +213,9 @@ static bool report_matches(const struct expect_report *r)
 		const bool is_atomic = (ty & KCSAN_ACCESS_ATOMIC);
 		const bool is_scoped = (ty & KCSAN_ACCESS_SCOPED);
 		const char *const access_type_aux =
-				(is_atomic && is_scoped)	? " (marked, scoped)"
+				(is_atomic && is_scoped)	? " (marked, reordered)"
 				: (is_atomic			? " (marked)"
-				   : (is_scoped			? " (scoped)" : ""));
+				   : (is_scoped			? " (reordered)" : ""));
 
 		if (i == 1) {
 			/* Access 2 */
diff --git a/kernel/kcsan/report.c b/kernel/kcsan/report.c
index fc15077991c4..1b0e050bdf6a 100644
--- a/kernel/kcsan/report.c
+++ b/kernel/kcsan/report.c
@@ -215,9 +215,9 @@ static const char *get_access_type(int type)
 	if (type & KCSAN_ACCESS_ASSERT) {
 		if (type & KCSAN_ACCESS_SCOPED) {
 			if (type & KCSAN_ACCESS_WRITE)
-				return "assert no accesses (scoped)";
+				return "assert no accesses (reordered)";
 			else
-				return "assert no writes (scoped)";
+				return "assert no writes (reordered)";
 		} else {
 			if (type & KCSAN_ACCESS_WRITE)
 				return "assert no accesses";
@@ -240,17 +240,17 @@ static const char *get_access_type(int type)
 	case KCSAN_ACCESS_COMPOUND | KCSAN_ACCESS_WRITE | KCSAN_ACCESS_ATOMIC:
 		return "read-write (marked)";
 	case KCSAN_ACCESS_SCOPED:
-		return "read (scoped)";
+		return "read (reordered)";
 	case KCSAN_ACCESS_SCOPED | KCSAN_ACCESS_ATOMIC:
-		return "read (marked, scoped)";
+		return "read (marked, reordered)";
 	case KCSAN_ACCESS_SCOPED | KCSAN_ACCESS_WRITE:
-		return "write (scoped)";
+		return "write (reordered)";
 	case KCSAN_ACCESS_SCOPED | KCSAN_ACCESS_WRITE | KCSAN_ACCESS_ATOMIC:
-		return "write (marked, scoped)";
+		return "write (marked, reordered)";
 	case KCSAN_ACCESS_SCOPED | KCSAN_ACCESS_COMPOUND | KCSAN_ACCESS_WRITE:
-		return "read-write (scoped)";
+		return "read-write (reordered)";
 	case KCSAN_ACCESS_SCOPED | KCSAN_ACCESS_COMPOUND | KCSAN_ACCESS_WRITE | KCSAN_ACCESS_ATOMIC:
-		return "read-write (marked, scoped)";
+		return "read-write (marked, reordered)";
 	default:
 		BUG();
 	}
-- 
2.34.0.rc2.393.gf8c9666880-goog