[S390] Bogomips calculation for 64 bit.

The bogomips calculation triggered via reading from /proc/cpuinfo
can return incorrect values if the qrnnd assembly is called with a
pointer in %r2 with any of the upper 32 bits set.
Fix this by using 64 bit division / remainder operation provided by
gcc instead of calling the assembly.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/asm-s390/sfp-util.h b/include/asm-s390/sfp-util.h
index 8cabcd23d976..0addc6466d95 100644
--- a/include/asm-s390/sfp-util.h
+++ b/include/asm-s390/sfp-util.h
@@ -51,6 +51,16 @@
         wl = __wl;                                      \
 })
 
+#ifdef __s390x__
+#define udiv_qrnnd(q, r, n1, n0, d)                     \
+  do { unsigned long __n;                               \
+       unsigned int __r, __d;                           \
+    __n = ((unsigned long)(n1) << 32) + n0;             \
+    __d = (d);                                          \
+    (q) = __n / __d;                                    \
+    (r) = __n % __d;                                    \
+  } while (0)
+#else
 #define udiv_qrnnd(q, r, n1, n0, d)                     \
   do { unsigned int __r;                                \
     (q) = __udiv_qrnnd (&__r, (n1), (n0), (d));         \
@@ -58,6 +68,7 @@
   } while (0)
 extern unsigned long __udiv_qrnnd (unsigned int *, unsigned int,
                                    unsigned int , unsigned int);
+#endif
 
 #define UDIV_NEEDS_NORMALIZATION 0