Merge branch 'work.ipc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

[sfrench/cifs-2.6.git] / include / linux / time.h

diff --git a/include/linux/time.h b/include/linux/time.h
index 3d0cd017f0d78b76d851df668ec29c7d0c6e3b09..9bc1f945777cdefb2ce787eacf59abc1dd42e796 100644 (file)
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -285,4 +285,19 @@ static inline bool itimerspec64_valid(const struct itimerspec64 *its)
        return true;
 }
 
+/**
+ * time_after32 - compare two 32-bit relative times
+ * @a: the time which may be after @b
+ * @b: the time which may be before @a
+ *
+ * time_after32(a, b) returns true if the time @a is after time @b.
+ * time_before32(b, a) returns true if the time @b is before time @a.
+ *
+ * Similar to time_after(), compare two 32-bit timestamps for relative
+ * times.  This is useful for comparing 32-bit seconds values that can't
+ * be converted to 64-bit values (e.g. due to disk format or wire protocol
+ * issues) when it is known that the times are less than 68 years apart.
+ */
+#define time_after32(a, b)     ((s32)((u32)(b) - (u32)(a)) < 0)
+#define time_before32(b, a)    time_after32(a, b)
 #endif