2 files changed, 56 insertions, 3 deletions

diff --git a/lib/string.c b/lib/string.c
index 9f75b4ec50b8..a1cdcfcc42d0 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -667,7 +667,7 @@ EXPORT_SYMBOL(memscan);
  */
 char *strstr(const char *s1, const char *s2)
 {
-        int l1, l2;
+        size_t l1, l2;
 
         l2 = strlen(s2);
         if (!l2)
@@ -684,6 +684,31 @@ char *strstr(const char *s1, const char *s2)
 EXPORT_SYMBOL(strstr);
 #endif
 
+#ifndef __HAVE_ARCH_STRNSTR
+/**
+ * strnstr - Find the first substring in a length-limited string
+ * @s1: The string to be searched
+ * @s2: The string to search for
+ * @len: the maximum number of characters to search
+ */
+char *strnstr(const char *s1, const char *s2, size_t len)
+{
+        size_t l1 = len, l2;
+
+        l2 = strlen(s2);
+        if (!l2)
+                return (char *)s1;
+        while (l1 >= l2) {
+                l1--;
+                if (!memcmp(s1, s2, l2))
+                        return (char *)s1;
+                s1++;
+        }
+        return NULL;
+}
+EXPORT_SYMBOL(strnstr);
+#endif
+
 #ifndef __HAVE_ARCH_MEMCHR
 /**
  * memchr - Find a character in an area of memory.
diff --git a/lib/zlib_inflate/inffast.c b/lib/zlib_inflate/inffast.c
index 05e1559fa156..215447c55261 100644
--- a/lib/zlib_inflate/inffast.c
+++ b/lib/zlib_inflate/inffast.c
@@ -4,12 +4,25 @@
  */
 
 #include <linux/zutil.h>
-#include <asm/unaligned.h>
-#include <asm/byteorder.h>
 #include "inftrees.h"
 #include "inflate.h"
 #include "inffast.h"
 
+/* Only do the unaligned "Faster" variant when
+ * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS is set
+ *
+ * On powerpc, it won't be as we don't include autoconf.h
+ * automatically for the boot wrapper, which is intended as
+ * we run in an environment where we may not be able to deal
+ * with (even rare) alignment faults. In addition, we do not
+ * define __KERNEL__ for arch/powerpc/boot unlike x86
+ */
+
+#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
+#include <asm/unaligned.h>
+#include <asm/byteorder.h>
+#endif
+
 #ifndef ASMINF
 
 /* Allow machine dependent optimization for post-increment or pre-increment.
@@ -243,6 +256,7 @@ void inflate_fast(z_streamp strm, unsigned start)
                     }
                 }
                 else {
+#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
                     unsigned short *sout;
                     unsigned long loops;
 
@@ -284,6 +298,20 @@ void inflate_fast(z_streamp strm, unsigned start)
                     }
                     if (len & 1)
                         PUP(out) = PUP(from);
+#else /* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */
+                    from = out - dist;          /* copy direct from output */
+                    do {                        /* minimum length is three */
+                         PUP(out) = PUP(from);
+                         PUP(out) = PUP(from);
+                         PUP(out) = PUP(from);
+                         len -= 3;
+                    } while (len > 2);
+                    if (len) {
+                         PUP(out) = PUP(from);
+                         if (len > 1)
+                             PUP(out) = PUP(from);
+                    }
+#endif /* !CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */
                 }
             }
             else if ((op & 64) == 0) {          /* 2nd level distance code */