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Thu, 04 Jun 2026 17:40:13 -0700 (PDT) From: Samuel Moelius To: Steven Rostedt Cc: Samuel Moelius , Masami Hiramatsu , Mathieu Desnoyers , linux-kernel@vger.kernel.org (open list:TRACING), linux-trace-kernel@vger.kernel.org (open list:TRACING) Subject: [PATCH] tracing: reject invalid preemptirq_delay_test CPU affinity Date: Fri, 5 Jun 2026 00:40:06 +0000 Message-ID: <20260605004006.2041148-1-sam.moelius@trailofbits.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" preemptirq_delay_test accepts cpu_affinity as a module parameter and, when it is non-negative, writes that CPU directly into a temporary cpumask from the worker thread. Values outside nr_cpu_ids can set a bit outside the allocated cpumask before the test reports a normal affinity error. Validate the requested CPU before starting the worker thread, and return -EINVAL for invalid affinity requests. Assisted-by: Codex:gpt-5.5-cyber-preview Signed-off-by: Samuel Moelius --- kernel/trace/preemptirq_delay_test.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/kernel/trace/preemptirq_delay_test.c b/kernel/trace/preemptirq= _delay_test.c index acb0c971a408..0f017799754a 100644 --- a/kernel/trace/preemptirq_delay_test.c +++ b/kernel/trace/preemptirq_delay_test.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -152,6 +153,15 @@ static int preemptirq_run_test(void) struct task_struct *task; char task_name[50]; =20 + if (cpu_affinity > -1) { + unsigned int cpu =3D cpu_affinity; + + if (cpu >=3D nr_cpu_ids || !cpu_possible(cpu)) { + pr_err("cpu_affinity:%d, invalid CPU\n", cpu_affinity); + return -EINVAL; + } + } + init_completion(&done); =20 snprintf(task_name, sizeof(task_name), "%s_test", test_mode); --=20 2.43.0