--- libmalloc/libmalloc-425.100.7/src/nano_malloc_common.h
+++ libmalloc/libmalloc-374.100.5/src/nano_malloc_common.h
@@ -24,6 +24,13 @@
 #ifndef __NANO_MALLOC_COMMON_H
 #define __NANO_MALLOC_COMMON_H
 
+// Definitions that are common to Nano
+#if TARGET_OS_OSX || TARGET_OS_SIMULATOR || TARGET_OS_DRIVERKIT
+#define NANO_PREALLOCATE_BAND_VM 0
+#else // TARGET_OS_OSX || TARGET_OS_SIMULATOR || TARGET_OS_DRIVERKIT
+#define NANO_PREALLOCATE_BAND_VM 1 // pre-allocate reserved vm range
+#endif // TARGET_OS_OSX || TARGET_OS_SIMULATOR || TARGET_OS_DRIVERKIT
+
 typedef enum {
 	NANO_NONE	= 0,
 	NANO_V2		= 2,
@@ -38,11 +45,7 @@
 extern unsigned int nano_common_max_magazines;
 
 MALLOC_NOEXPORT
-extern bool nano_common_max_magazines_is_ncpu;
-
-// Index of last region to be allocated
-MALLOC_NOEXPORT
-extern unsigned int nano_max_region;
+extern boolean_t nano_common_max_magazines_is_ncpu;
 
 MALLOC_NOEXPORT
 void
@@ -62,16 +65,8 @@
 		unsigned debug_flags, int vm_page_label, void *base_addr);
 
 MALLOC_NOEXPORT
-bool
+boolean_t
 nano_common_allocate_vm_space(mach_vm_address_t base, mach_vm_size_t size);
-
-MALLOC_NOEXPORT
-bool
-nano_common_reserve_vm_space(mach_vm_address_t base, mach_vm_size_t size);
-
-MALLOC_NOEXPORT
-bool
-nano_common_unprotect_vm_space(mach_vm_address_t base, mach_vm_size_t size);
 
 MALLOC_NOEXPORT
 void