--- libmalloc/libmalloc-283/src/nano_malloc_common.c
+++ libmalloc/libmalloc-166.251.2/src/nano_malloc_common.c
@@ -46,7 +46,7 @@
 
 // The maximum number of per-CPU allocation regions to use for Nano.
 unsigned int nano_common_max_magazines;
-boolean_t nano_common_max_magazines_is_ncpu = true;
+boolean_t nano_common_max_magazines_is_ncpu;
 
 // Boot argument for nano_common_max_magazines
 static const char nano_max_magazines_boot_arg[] = "malloc_nano_max_magazines";
@@ -162,11 +162,6 @@
 
 	// Environment variable overrides boot arg, unless it's not valid.
 	const char *flag = getenv("MallocNanoMaxMagazines");
-#if RDAR_48993662
-	if (!flag) {
-		flag = getenv("_MallocNanoMaxMagazines");
-	}
-#endif // RDAR_48993662
 	if (flag) {
 		int value = (int)strtol(flag, NULL, 0);
 		if (value < 0) {
@@ -294,17 +289,11 @@
 void
 nano_common_cpu_number_override_set()
 {
-	boolean_t is_ncpu = _os_cpu_number_override == -1 && nano_common_max_magazines == phys_ncpus;
-	
 	// This facilitates a shortcut in nanov2_get_allocation_block_index() --
 	// if nano_common_max_magazines_is_ncpu is true, we can also assume that
 	// _os_cpu_number_override == -1 (i.e. we are not in malloc_replay).
-	//
-	// We check here for false, because we don't want to write "true" to a __DATA page because
-	// that would make it dirty: <rdar://problem/46994833>
-	if (!is_ncpu) {
-		nano_common_max_magazines_is_ncpu = is_ncpu;
-	}
+	nano_common_max_magazines_is_ncpu = _os_cpu_number_override == -1 &&
+			nano_common_max_magazines == phys_ncpus;
 }
 
 #endif // CONFIG_NANOZONE