updated to work on all platforms (actually map sure that the physical

address we are trying to access is mapped before accessing it.)

--HG--
extra : convert_revision : 104341334a3d2bb812a6b0b6277ab353f8f9b39e

util/ccdrv/devtime.c

@@ -34,6 +34,7 @@
 #include <asm/uaccess.h>
 #include <linux/kernel.h>
 #include <asm/io.h>
+#include <asm/page.h>
 #include <linux/netdevice.h>
 
 #ifdef __i386__
@@ -70,6 +71,14 @@ static int __init devtime_start(void)
         devSum = 0;
         devCnt = count;
 
+        addr = ioremap(addr, PAGE_SIZE);
+        /**
+         * Make sure that the remapping actually worked. On alpha we have
+         * linear addressing, so its not a problem. But it can fail in x86
+         * if physical memory is mapped to this address.
+         */
+        if (addr)
+        {
             printk("Preparing to read %#llx %d times.\n", addr, count);
 
             t1 = cycleCounter(trash);
@@ -81,7 +90,15 @@ static int __init devtime_start(void)
                 t1 = t2;
             }
 
+            /**
+             * Unmap the address.
+             */
+            iounmap(addr);
+
             printk("Read Address %#llx %ld times. Average latency %ld.\n", addr, devCnt, devSum/devCnt);
+        }
+        else
+            printk("Unable to remap address. Please try again later.\n");
     } else {
         dev = dev_get_by_name("eth0");
         if (dev)
@@ -90,6 +107,7 @@ static int __init devtime_start(void)
                     dev->mem_end, dev->base_addr);
             dev_put(dev);
         }
+        dev = 0;
         dev = dev_get_by_name("eth1");
         if (dev)
         {