--- radeon_cs_gem.c.orig	2014-11-23 13:22:34.000000000 -0500
+++ radeon_cs_gem.c	2014-11-23 13:24:46.000000000 -0500
@@ -81,11 +81,27 @@
 /**
  * result is undefined if called with ~0
  */
+  /* __builtin_ctz returns number of trailing zeros. */
+/*
 static uint32_t get_first_zero(const uint32_t n)
 {
-    /* __builtin_ctz returns number of trailing zeros. */
     return 1 << __builtin_ctz(~n);
 }
+*/
+
+#include <limits.h>
+static uint32_t get_first_zero(const uint32_t n)
+{
+   unsigned int x,i, s, nn ;
+   nn=(unsigned int) n;
+   x=0;i=0;s=sizeof(n);
+   for(i=1;i<=sizeof(n)*CHAR_BIT;++i)
+   {
+     if( (nn & 1) == 0 ) ++x; else break;
+     nn=nn>>1;
+   }
+   return (uint32_t) x;
+}
 
 /**
  * Returns a free id for cs.