Bedrock Linux suspend kernel patch

linux-etcfs-suspend.patch

diff -ura linux-6.9.7/kernel/power/process.c linux-6.9.7.new/kernel/power/process.c
--- linux-6.9.7/kernel/power/process.c	2024-07-18 14:51:49.353039741 +0300
+++ linux-6.9.7.new/kernel/power/process.c	2024-07-18 14:56:47.393032621 +0300
@@ -23,7 +23,7 @@
 /*
  * Timeout for stopping processes
  */
-unsigned int __read_mostly freeze_timeout_msecs = 20 * MSEC_PER_SEC;
+unsigned int __read_mostly freeze_timeout_msecs = 5 * MSEC_PER_SEC;
 
 static int try_to_freeze_tasks(bool user_only)
 {
@@ -31,7 +31,8 @@
 					"remaining freezable tasks";
 	struct task_struct *g, *p;
 	unsigned long end_time;
-	unsigned int todo;
+	unsigned int todo, etcfs;
+	bool freeze_etcfs = false;
 	bool wq_busy = false;
 	ktime_t start, end, elapsed;
 	unsigned int elapsed_msecs;
@@ -49,8 +50,15 @@
 
 	while (true) {
 		todo = 0;
+		etcfs = 0;
 		read_lock(&tasklist_lock);
 		for_each_process_thread(g, p) {
+			if (!freeze_etcfs
+				&& strcmp((const char*)p->comm, "etcfs") == 0) {
+				etcfs++;
+				continue;
+			}
+
 			if (p == current || !freeze_task(p))
 				continue;
 
@@ -63,7 +71,7 @@
 			todo += wq_busy;
 		}
 
-		if (!todo || time_after(jiffies, end_time))
+		if ((!todo && !etcfs) || time_after(jiffies, end_time))
 			break;
 
 		if (pm_wakeup_pending()) {
@@ -71,6 +79,9 @@
 			break;
 		}
 
+		if (!todo)
+			freeze_etcfs = true;
+
 		/*
 		 * We need to retry, but first give the freezing tasks some
 		 * time to enter the refrigerator.  Start with an initial