Re: [RFC PATCH for 4.17 02/21] rseq: Introduce restartable sequences system call (v12)

+#ifdef CONFIG_RSEQ
+	struct rseq __user *rseq;
+	u32 rseq_len;
+	u32 rseq_sig;
+	/*
+	 * RmW on rseq_event_mask must be performed atomically
+	 * with respect to preemption.
+	 */
+	unsigned long rseq_event_mask;
+#endif

+static inline void rseq_signal_deliver(struct pt_regs *regs)
+{
+	set_bit(RSEQ_EVENT_SIGNAL_BIT, &current->rseq_event_mask);
+	rseq_handle_notify_resume(regs);
+}
+
+static inline void rseq_preempt(struct task_struct *t)
+{
+	set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask);
+	rseq_set_notify_resume(t);
+}
+
+static inline void rseq_migrate(struct task_struct *t)
+{
+	set_bit(RSEQ_EVENT_MIGRATE_BIT, &t->rseq_event_mask);
+	rseq_set_notify_resume(t);
+}