- patches.fixes/patch-2.6.11-rc1: 2.6.11-rc1.

[linux-flexiantxendom0-3.2.10.git] / include / linux / jiffies.h

diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index d45eff8..d882d68 100644 (file)
--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -70,13 +70,19 @@
 /* a value TUSEC for TICK_USEC (can be set bij adjtimex)               */
 #define TICK_USEC_TO_NSEC(TUSEC) (SH_DIV (TUSEC * USER_HZ * 1000, ACTHZ, 8))
 
+/* some arch's have a small-data section that can be accessed register-relative
+ * but that can only take up to, say, 4-byte variables. jiffies being part of
+ * an 8-byte variable may not be correctly accessed unless we force the issue
+ */
+#define __jiffy_data  __attribute__((section(".data")))
+
 /*
  * The 64-bit value is not volatile - you MUST NOT read it
  * without sampling the sequence number in xtime_lock.
  * get_jiffies_64() will do this for you as appropriate.
  */
-extern u64 jiffies_64;
-extern unsigned long volatile jiffies;
+extern u64 __jiffy_data jiffies_64;
+extern unsigned long volatile __jiffy_data jiffies;
 
 #if (BITS_PER_LONG < 64)
 u64 get_jiffies_64(void);