diff --git a/libc/arch-arm/krait/bionic/memcpy.S b/libc/arch-arm/krait/bionic/memcpy.S
index 0cd4d44..4a21709 100644
--- a/libc/arch-arm/krait/bionic/memcpy.S
+++ b/libc/arch-arm/krait/bionic/memcpy.S
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008 The Android Open Source Project
+ * Copyright (C) 2013 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -45,9 +45,8 @@
 ENTRY(memcpy)
         .save       {r0, lr}
         /* start preloading as early as possible */
-        pld         [r1, #(CACHE_LINE_SIZE*0)]
+        pld         [r1, #(CACHE_LINE_SIZE*4)]
         stmfd       sp!, {r0, lr}
-        pld         [r1, #(CACHE_LINE_SIZE*2)]
 
         /* do we have at least 16-bytes to copy (needed for alignment below) */
         cmp         r2, #16
@@ -56,7 +55,7 @@
         /* align destination to cache-line for the write-buffer */
         rsb         r3, r0, #0
         ands        r3, r3, #0xF
-        beq         0f
+        beq         2f
 
         /* copy up to 15-bytes (count in r3) */
         sub         r2, r2, r3
@@ -76,47 +75,29 @@
         // copies 8 bytes, destination 64-bits aligned
         vld1.8      {d0}, [r1]!
         vst1.8      {d0}, [r0, :64]!
-2:
 
-0:      /* preload immediately the next cache line, which we may need */
-        pld         [r1, #(CACHE_LINE_SIZE*0)]
-        pld         [r1, #(CACHE_LINE_SIZE*2)]
-
-        /* make sure we have at least 64 bytes to copy */
+2:      /* make sure we have at least 64 bytes to copy */
         subs        r2, r2, #64
         blo         2f
 
-        /* Preload all the cache lines we need.
-         * NOTE: The number of pld below depends on CACHE_LINE_SIZE,
-         * ideally we would increase the distance in the main loop to
-         * avoid the goofy code below. In practice this doesn't seem to make
-         * a big difference.
-         * NOTE: The value CACHE_LINE_SIZE * 8 was chosen through
-         * experimentation.
-         */
-        pld         [r1, #(CACHE_LINE_SIZE*4)]
-        pld         [r1, #(CACHE_LINE_SIZE*6)]
-        pld         [r1, #(CACHE_LINE_SIZE*8)]
-
 1:      /* The main loop copies 64 bytes at a time */
         vld1.8      {d0  - d3},   [r1]!
         vld1.8      {d4  - d7},   [r1]!
-        pld         [r1, #(CACHE_LINE_SIZE*8)]
+        pld         [r1, #(CACHE_LINE_SIZE*2)]
         subs        r2, r2, #64
         vst1.8      {d0  - d3},   [r0, :128]!
         vst1.8      {d4  - d7},   [r0, :128]!
         bhs         1b
 
 2:      /* fix-up the remaining count and make sure we have >= 32 bytes left */
-        add         r2, r2, #64
-        subs        r2, r2, #32
+        adds        r2, r2, #32
         blo         4f
 
-3:      /* 32 bytes at a time. These cache lines were already preloaded */
+        /* Copy 32 bytes. These cache lines were already preloaded */
         vld1.8      {d0 - d3},  [r1]!
-        subs        r2, r2, #32
+        sub         r2, r2, #32
         vst1.8      {d0 - d3},  [r0, :128]!
-        bhs         3b
+
 4:      /* less than 32 left */
         add         r2, r2, #32
         tst         r2, #0x10
diff --git a/libc/bionic/mmap.c b/libc/bionic/mmap.c
index 40a6538..e097086 100644
--- a/libc/bionic/mmap.c
+++ b/libc/bionic/mmap.c
@@ -34,10 +34,17 @@
 #define  MMAP2_SHIFT  12
 void* mmap(void *addr, size_t size, int prot, int flags, int fd, long offset)
 {
+    void *ret;
+
     if (offset & ((1UL << MMAP2_SHIFT)-1)) {
         errno = EINVAL;
         return MAP_FAILED;
     }
 
-    return __mmap2(addr, size, prot, flags, fd, (size_t)offset >> MMAP2_SHIFT);
+    ret = __mmap2(addr, size, prot, flags, fd, (size_t)offset >> MMAP2_SHIFT);
+
+    if (ret && (flags & (MAP_PRIVATE | MAP_ANONYMOUS)))
+	    madvise(ret, size, MADV_MERGEABLE);
+
+    return ret;
 }
diff --git a/libc/netbsd/resolv/res_cache.c b/libc/netbsd/resolv/res_cache.c
index 829bf10..3576202 100644
--- a/libc/netbsd/resolv/res_cache.c
+++ b/libc/netbsd/resolv/res_cache.c
@@ -1833,7 +1833,7 @@
 /* return 1 if the provided list of name servers differs from the list of name servers
  * currently attached to the provided cache_info */
 static int _resolv_is_nameservers_equal_locked(struct resolv_cache_info* cache_info,
-        char** servers, int numservers);
+        const char** servers, int numservers);
 /* remove a resolv_pidiface_info structure from _res_pidiface_list */
 static void _remove_pidiface_info_locked(int pid);
 /* get a resolv_pidiface_info structure from _res_pidiface_list with a certain pid */
@@ -2076,7 +2076,7 @@
 }
 
 void
-_resolv_set_nameservers_for_iface(const char* ifname, char** servers, int numservers,
+_resolv_set_nameservers_for_iface(const char* ifname, const char** servers, int numservers,
         const char *domains)
 {
     int i, rt, index;
@@ -2149,7 +2149,7 @@
 
 static int
 _resolv_is_nameservers_equal_locked(struct resolv_cache_info* cache_info,
-        char** servers, int numservers)
+        const char** servers, int numservers)
 {
     int i;
     char** ns;
@@ -2271,8 +2271,8 @@
         memcpy(&cache_info->ifaddr, addr, sizeof(*addr));
 
         if (DEBUG) {
-            char* addr_s = inet_ntoa(cache_info->ifaddr);
-            XLOG("address of interface %s is %s\n", ifname, addr_s);
+            XLOG("address of interface %s is %s\n",
+                    ifname, inet_ntoa(cache_info->ifaddr));
         }
     }
     pthread_mutex_unlock(&_res_cache_list_lock);
@@ -2411,26 +2411,24 @@
     return len;
 }
 
-int
-_resolv_get_default_iface(char* buff, int buffLen)
+size_t
+_resolv_get_default_iface(char* buff, size_t buffLen)
 {
-    char* ifname;
-    int len = 0;
-
     if (!buff || buffLen == 0) {
-        return -1;
+        return 0;
     }
 
     pthread_once(&_res_cache_once, _res_cache_init);
     pthread_mutex_lock(&_res_cache_list_lock);
 
-    ifname = _get_default_iface_locked(); // never null, but may be empty
+    char* ifname = _get_default_iface_locked(); // never null, but may be empty
 
     // if default interface not set. Get first cache with an interface
     if (ifname[0] == '\0') {
         ifname = _find_any_iface_name_locked(); // may be null
     }
 
+    size_t len = 0;
     // if we got the default iface or if (no-default) the find_any call gave an answer
     if (ifname) {
         len = strlen(ifname);
@@ -2447,28 +2445,32 @@
     return len;
 }
 
-int
+void
 _resolv_populate_res_for_iface(res_state statp)
 {
-    int nserv;
-    struct resolv_cache_info* info = NULL;
+    if (statp == NULL) {
+        return;
+    }
 
-    if (statp) {
+    if (statp->iface[0] == '\0') { // no interface set assign default
+        size_t if_len = _resolv_get_default_iface(statp->iface, sizeof(statp->iface));
+        if (if_len + 1 > sizeof(statp->iface)) {
+            XLOG("%s: INTERNAL_ERROR: can't fit interface name into statp->iface.\n", __FUNCTION__);
+            return;
+        }
+        if (if_len == 0) {
+            XLOG("%s: INTERNAL_ERROR: can't find any suitable interfaces.\n", __FUNCTION__);
+            return;
+        }
+    }
+
+    pthread_once(&_res_cache_once, _res_cache_init);
+    pthread_mutex_lock(&_res_cache_list_lock);
+
+    struct resolv_cache_info* info = _find_cache_info_locked(statp->iface);
+    if (info != NULL) {
+        int nserv;
         struct addrinfo* ai;
-
-        if (statp->iface[0] == '\0') { // no interface set assign default
-            _resolv_get_default_iface(statp->iface, sizeof(statp->iface));
-        }
-
-        pthread_once(&_res_cache_once, _res_cache_init);
-        pthread_mutex_lock(&_res_cache_list_lock);
-        info = _find_cache_info_locked(statp->iface);
-
-        if (info == NULL) {
-            pthread_mutex_unlock(&_res_cache_list_lock);
-            return 0;
-        }
-
         XLOG("_resolv_populate_res_for_iface: %s\n", statp->iface);
         for (nserv = 0; nserv < MAXNS; nserv++) {
             ai = info->nsaddrinfo[nserv];
@@ -2502,8 +2504,6 @@
         while (pp < statp->dnsrch + MAXDNSRCH && *p != -1) {
             *pp++ = &statp->defdname + *p++;
         }
-
-        pthread_mutex_unlock(&_res_cache_list_lock);
     }
-    return nserv;
+    pthread_mutex_unlock(&_res_cache_list_lock);
 }
diff --git a/libc/private/resolv_cache.h b/libc/private/resolv_cache.h
index d70857d..68a1180 100644
--- a/libc/private/resolv_cache.h
+++ b/libc/private/resolv_cache.h
@@ -28,6 +28,7 @@
 #ifndef _RESOLV_CACHE_H_
 #define _RESOLV_CACHE_H_
 
+#include <stddef.h>
 #include <sys/cdefs.h>
 
 struct __res_state;
@@ -77,16 +78,17 @@
 __LIBC_HIDDEN__
 extern struct in_addr* _resolv_get_addr_of_iface(const char* ifname);
 
-/* Copy the name of the default interface to provided buffer.
- * Return length of buffer on success on failure -1 is returned */
+/* Copy the name of the default interface to the provided buffer.
+ * Returns the string length of the default interface,
+ * be that less or more than the buffLen, or 0 if nothing had been written */
 __LIBC_HIDDEN__
-extern int _resolv_get_default_iface(char* buff, int buffLen);
+ extern size_t _resolv_get_default_iface(char* buff, size_t buffLen);
 
 /* sets the name server addresses to the provided res_state structure. The
  * name servers are retrieved from the cache which is associated
  * with the interface to which the res_state structure is associated */
 __LIBC_HIDDEN__
-extern int _resolv_populate_res_for_iface(struct __res_state* statp);
+extern void _resolv_populate_res_for_iface(struct __res_state* statp);
 
 typedef enum {
     RESOLV_CACHE_UNSUPPORTED,  /* the cache can't handle that kind of queries */
diff --git a/libc/private/resolv_iface.h b/libc/private/resolv_iface.h
index bf5abad..789d997 100644
--- a/libc/private/resolv_iface.h
+++ b/libc/private/resolv_iface.h
@@ -48,7 +48,7 @@
 extern void _resolv_set_default_iface(const char* ifname);
 
 /* set name servers for an interface */
-extern void _resolv_set_nameservers_for_iface(const char* ifname, char** servers, int numservers,
+extern void _resolv_set_nameservers_for_iface(const char* ifname, const char** servers, int numservers,
         const char *domains);
 
 /* tell resolver of the address of an interface */