--- zzzz-none-000/linux-3.10.107/arch/powerpc/kernel/epapr_paravirt.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/powerpc/kernel/epapr_paravirt.c	2021-02-04 17:41:59.000000000 +0000
@@ -18,6 +18,7 @@
  */
 
 #include <linux/of.h>
+#include <linux/of_fdt.h>
 #include <asm/epapr_hcalls.h>
 #include <asm/cacheflush.h>
 #include <asm/code-patching.h>
@@ -29,39 +30,56 @@
 #endif
 
 bool epapr_paravirt_enabled;
+static bool __maybe_unused epapr_has_idle;
 
-static int __init epapr_paravirt_init(void)
+static int __init early_init_dt_scan_epapr(unsigned long node,
+					   const char *uname,
+					   int depth, void *data)
 {
-	struct device_node *hyper_node;
 	const u32 *insts;
-	int len, i;
+	int len;
+	int i;
 
-	hyper_node = of_find_node_by_path("/hypervisor");
-	if (!hyper_node)
-		return -ENODEV;
-
-	insts = of_get_property(hyper_node, "hcall-instructions", &len);
+	insts = of_get_flat_dt_prop(node, "hcall-instructions", &len);
 	if (!insts)
-		return -ENODEV;
+		return 0;
 
 	if (len % 4 || len > (4 * 4))
-		return -ENODEV;
+		return -1;
 
 	for (i = 0; i < (len / 4); i++) {
-		patch_instruction(epapr_hypercall_start + i, insts[i]);
+		u32 inst = be32_to_cpu(insts[i]);
+		patch_instruction(epapr_hypercall_start + i, inst);
 #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
-		patch_instruction(epapr_ev_idle_start + i, insts[i]);
+		patch_instruction(epapr_ev_idle_start + i, inst);
 #endif
 	}
 
 #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
-	if (of_get_property(hyper_node, "has-idle", NULL))
-		ppc_md.power_save = epapr_ev_idle;
+	if (of_get_flat_dt_prop(node, "has-idle", NULL))
+		epapr_has_idle = true;
 #endif
 
 	epapr_paravirt_enabled = true;
 
+	return 1;
+}
+
+int __init epapr_paravirt_early_init(void)
+{
+	of_scan_flat_dt(early_init_dt_scan_epapr, NULL);
+
+	return 0;
+}
+
+static int __init epapr_idle_init(void)
+{
+#if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
+	if (epapr_has_idle)
+		ppc_md.power_save = epapr_ev_idle;
+#endif
+
 	return 0;
 }
 
-early_initcall(epapr_paravirt_init);
+postcore_initcall(epapr_idle_init);