2 files changed, 49 insertions, 32 deletions

diff --git a/arch/x86/include/asm/word-at-a-time.h b/arch/x86/include/asm/word-at-a-time.h
new file mode 100644
index 00000000000..6fe6767b712
--- /dev/null
+++ b/arch/x86/include/asm/word-at-a-time.h
@@ -0,0 +1,46 @@
+#ifndef _ASM_WORD_AT_A_TIME_H
+#define _ASM_WORD_AT_A_TIME_H
+
+/*
+ * This is largely generic for little-endian machines, but the
+ * optimal byte mask counting is probably going to be something
+ * that is architecture-specific. If you have a reliably fast
+ * bit count instruction, that might be better than the multiply
+ * and shift, for example.
+ */
+
+#ifdef CONFIG_64BIT
+
+/*
+ * Jan Achrenius on G+: microoptimized version of
+ * the simpler "(mask & ONEBYTES) * ONEBYTES >> 56"
+ * that works for the bytemasks without having to
+ * mask them first.
+ */
+static inline long count_masked_bytes(unsigned long mask)
+{
+        return mask*0x0001020304050608ul >> 56;
+}
+
+#else   /* 32-bit case */
+
+/* Carl Chatfield / Jan Achrenius G+ version for 32-bit */
+static inline long count_masked_bytes(long mask)
+{
+        /* (000000 0000ff 00ffff ffffff) -> ( 1 1 2 3 ) */
+        long a = (0x0ff0001+mask) >> 23;
+        /* Fix the 1 for 00 case */
+        return a & mask;
+}
+
+#endif
+
+#define REPEAT_BYTE(x)  ((~0ul / 0xff) * (x))
+
+/* Return the high bit set in the first byte that is a zero */
+static inline unsigned long has_zero(unsigned long a)
+{
+        return ((a - REPEAT_BYTE(0x01)) & ~a) & REPEAT_BYTE(0x80);
+}
+
+#endif /* _ASM_WORD_AT_A_TIME_H */
diff --git a/fs/namei.c b/fs/namei.c
index 1898198abc3..0062dd17eb5 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1407,18 +1407,9 @@ static inline int can_lookup(struct inode *inode)
  */
 #ifdef CONFIG_DCACHE_WORD_ACCESS
 
-#ifdef CONFIG_64BIT
+#include <asm/word-at-a-time.h>
 
-/*
- * Jan Achrenius on G+: microoptimized version of
- * the simpler "(mask & ONEBYTES) * ONEBYTES >> 56"
- * that works for the bytemasks without having to
- * mask them first.
- */
-static inline long count_masked_bytes(unsigned long mask)
-{
-        return mask*0x0001020304050608ul >> 56;
-}
+#ifdef CONFIG_64BIT
 
 static inline unsigned int fold_hash(unsigned long hash)
 {
@@ -1428,15 +1419,6 @@ static inline unsigned int fold_hash(unsigned long hash)
 
 #else   /* 32-bit case */
 
-/* Carl Chatfield / Jan Achrenius G+ version for 32-bit */
-static inline long count_masked_bytes(long mask)
-{
-        /* (000000 0000ff 00ffff ffffff) -> ( 1 1 2 3 ) */
-        long a = (0x0ff0001+mask) >> 23;
-        /* Fix the 1 for 00 case */
-        return a & mask;
-}
-
 #define fold_hash(x) (x)
 
 #endif
@@ -1464,17 +1446,6 @@ done:
 }
 EXPORT_SYMBOL(full_name_hash);
 
-#define REPEAT_BYTE(x)  ((~0ul / 0xff) * (x))
-#define ONEBYTES        REPEAT_BYTE(0x01)
-#define SLASHBYTES      REPEAT_BYTE('/')
-#define HIGHBITS        REPEAT_BYTE(0x80)
-
-/* Return the high bit set in the first byte that is a zero */
-static inline unsigned long has_zero(unsigned long a)
-{
-        return ((a - ONEBYTES) & ~a) & HIGHBITS;
-}
-
 /*
  * Calculate the length and hash of the path component, and
  * return the length of the component;
@@ -1490,7 +1461,7 @@ static inline unsigned long hash_name(const char *name, unsigned int *hashp)
                 len += sizeof(unsigned long);
                 a = *(unsigned long *)(name+len);
                 /* Do we have any NUL or '/' bytes in this word? */
-                mask = has_zero(a) | has_zero(a ^ SLASHBYTES);
+                mask = has_zero(a) | has_zero(a ^ REPEAT_BYTE('/'));
         } while (!mask);
 
         /* The mask *below* the first high bit set */