scx_tickless: Switch to scx_bpf_remote_curr()

The new scx_bpf_remote_curr() is safer to use, switch to it
from scx_bpf_cpu_rq() as we only care about it's ->curr anyway.

Signed-off-by: Christian Loehle <[email protected]>

Author: cloehle

scheds/rust/scx_tickless/src/bpf/main.bpf.c

@@ -414,12 +414,17 @@ static int sched_timerfn(void *map, int *key, struct bpf_timer *timer)
 	 */
 	bpf_for(cpu, 0, nr_cpu_ids) {
 		struct task_struct *p;
+		bool idle;
 
 		/*
 		 * Ignore CPU if idle task is running.
 		 */
-		p = scx_bpf_cpu_rq(cpu)->curr;
-		if (p->flags & PF_IDLE)
+		p = scx_bpf_remote_curr(cpu);
+		if (!p)
+			continue;
+		idle = p->flags & PF_IDLE;
+		bpf_task_release(p);
+		if (idle)
 			continue;
 
 		/*