linux-kernel - [tip: sched/core] selftests/rseq: parametrized test: Report/abort on negative concurrency ID

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Date:   Tue, 27 Dec 2022 12:13:49 -0000
From:   "tip-bot2 for Mathieu Desnoyers" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] selftests/rseq: parametrized test: Report/abort on
 negative concurrency ID

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     a3798e6ffb37481c47773dd1d785c395c0785af8
Gitweb:        https://git.kernel.org/tip/a3798e6ffb37481c47773dd1d785c395c0785af8
Author:        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
AuthorDate:    Tue, 22 Nov 2022 15:39:22 -05:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 27 Dec 2022 12:52:15 +01:00

selftests/rseq: parametrized test: Report/abort on negative concurrency ID

Report and abort when a negative concurrency ID value is observed by the
spinlock test.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/20221122203932.231377-21-mathieu.desnoyers@efficios.com
---
 tools/testing/selftests/rseq/param_test.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/rseq/param_test.c b/tools/testing/selftests/rseq/param_test.c
index cadb9d8..bf951a4 100644
--- a/tools/testing/selftests/rseq/param_test.c
+++ b/tools/testing/selftests/rseq/param_test.c
@@ -410,6 +410,11 @@ static int rseq_this_cpu_lock(struct percpu_lock *lock)
 		int ret;
 
 		cpu = get_current_cpu_id();
+		if (cpu < 0) {
+			fprintf(stderr, "pid: %d: tid: %d, cpu: %d: cid: %d\n",
+					getpid(), (int) rseq_gettid(), rseq_current_cpu_raw(), cpu);
+			abort();
+		}
 		ret = rseq_cmpeqv_storev(RSEQ_MO_RELAXED, RSEQ_PERCPU,
 					 &lock->c[cpu].v,
 					 0, 1, cpu);