x86, cacheinfo: Turn off L3 cache index disable feature in virtualized environments
[linux-2.6.git] / lib / checksum.c
index 12e5a1c..0975087 100644 (file)
@@ -37,7 +37,8 @@
 
 #include <asm/byteorder.h>
 
-static inline unsigned short from32to16(unsigned long x)
+#ifndef do_csum
+static inline unsigned short from32to16(unsigned int x)
 {
        /* add up 16-bit and 16-bit for 16+c bit */
        x = (x & 0xffff) + (x >> 16);
@@ -49,13 +50,17 @@ static inline unsigned short from32to16(unsigned long x)
 static unsigned int do_csum(const unsigned char *buff, int len)
 {
        int odd, count;
-       unsigned long result = 0;
+       unsigned int result = 0;
 
        if (len <= 0)
                goto out;
        odd = 1 & (unsigned long) buff;
        if (odd) {
+#ifdef __LITTLE_ENDIAN
+               result += (*buff << 8);
+#else
                result = *buff;
+#endif
                len--;
                buff++;
        }
@@ -69,9 +74,9 @@ static unsigned int do_csum(const unsigned char *buff, int len)
                }
                count >>= 1;            /* nr of 32-bit words.. */
                if (count) {
-                       unsigned long carry = 0;
+                       unsigned int carry = 0;
                        do {
-                               unsigned long w = *(unsigned long *) buff;
+                               unsigned int w = *(unsigned int *) buff;
                                count--;
                                buff += 4;
                                result += carry;
@@ -87,13 +92,18 @@ static unsigned int do_csum(const unsigned char *buff, int len)
                }
        }
        if (len & 1)
+#ifdef __LITTLE_ENDIAN
+               result += *buff;
+#else
                result += (*buff << 8);
+#endif
        result = from32to16(result);
        if (odd)
                result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
 out:
        return result;
 }
+#endif
 
 /*
  *     This is a version of ip_compute_csum() optimized for IP headers,