Merge branch 'rework/misc-cleanups' into for-linus

kernel/printk/printk.c

@@ -3727,7 +3727,8 @@ late_initcall(printk_late_init);
 /* If @con is specified, only wait for that console. Otherwise wait for all. */
 static bool __pr_flush(struct console *con, int timeout_ms, bool reset_on_progress)
 {
-	int remaining = timeout_ms;
+	unsigned long timeout_jiffies = msecs_to_jiffies(timeout_ms);
+	unsigned long remaining_jiffies = timeout_jiffies;
 	struct console *c;
 	u64 last_diff = 0;
 	u64 printk_seq;
@@ -3744,6 +3745,9 @@ static bool __pr_flush(struct console *con, int timeout_ms, bool reset_on_progre
 	console_unlock();
 
 	for (;;) {
+		unsigned long begin_jiffies;
+		unsigned long slept_jiffies;
+
 		diff = 0;
 
 		/*
@@ -3772,24 +3776,20 @@ static bool __pr_flush(struct console *con, int timeout_ms, bool reset_on_progre
 		console_srcu_read_unlock(cookie);
 
 		if (diff != last_diff && reset_on_progress)
-			remaining = timeout_ms;
+			remaining_jiffies = timeout_jiffies;
 
 		console_unlock();
 
 		/* Note: @diff is 0 if there are no usable consoles. */
-		if (diff == 0 || remaining == 0)
+		if (diff == 0 || remaining_jiffies == 0)
 			break;
 
-		if (remaining < 0) {
-			/* no timeout limit */
-			msleep(100);
-		} else if (remaining < 100) {
-			msleep(remaining);
-			remaining = 0;
-		} else {
-			msleep(100);
-			remaining -= 100;
-		}
+		/* msleep(1) might sleep much longer. Check time by jiffies. */
+		begin_jiffies = jiffies;
+		msleep(1);
+		slept_jiffies = jiffies - begin_jiffies;
+
+		remaining_jiffies -= min(slept_jiffies, remaining_jiffies);
 
 		last_diff = diff;
 	}