2 files changed, 31 insertions, 5 deletions

diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 826a30a00f59..bb2465bcb327 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -20,7 +20,7 @@
 all: $(obj)/zImage
 
 BOOTCFLAGS    := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
-                 -fno-strict-aliasing -Os -msoft-float -pipe -D__KERNEL__\
+                 -fno-strict-aliasing -Os -msoft-float -pipe \
                  -fomit-frame-pointer -fno-builtin -fPIC -nostdinc \
                  -isystem $(shell $(CROSS32CC) -print-file-name=include)
 BOOTAFLAGS      := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
@@ -34,8 +34,6 @@ BOOTCFLAGS	+= -fno-stack-protector
 endif
 
 BOOTCFLAGS      += -I$(obj) -I$(srctree)/$(obj)
-BOOTCFLAGS      += -include include/linux/autoconf.h -Iarch/powerpc/include
-BOOTCFLAGS      += -Iinclude
 
 DTS_FLAGS       ?= -p 1024
 
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 */