Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/juhl/trivial

[~andy/linux] / include / linux / jiffies.h

diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index 8b080024bbc1fe649770c44b8df540da8ec87d39..33ef710dac24481774d14d2333f73e0af34de6a5 100644 (file)
--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -29,14 +29,20 @@
 # define SHIFT_HZ      9
 #elif HZ >= 768 && HZ < 1536
 # define SHIFT_HZ      10
+#elif HZ >= 1536 && HZ < 3072
+# define SHIFT_HZ      11
+#elif HZ >= 3072 && HZ < 6144
+# define SHIFT_HZ      12
+#elif HZ >= 6144 && HZ < 12288
+# define SHIFT_HZ      13
 #else
-# error You lose.
+# error Invalid value of HZ.
 #endif
 
 /* LATCH is used in the interval timer and ftape setup. */
 #define LATCH  ((CLOCK_TICK_RATE + HZ/2) / HZ) /* For divider */
 
-/* Suppose we want to devide two numbers NOM and DEN: NOM/DEN, the we can
+/* Suppose we want to devide two numbers NOM and DEN: NOM/DEN, then we can
  * improve accuracy by shifting LSH bits, hence calculating:
  *     (NOM << LSH) / DEN
  * This however means trouble for large NOM, because (NOM << LSH) may no
@@ -128,6 +134,22 @@ static inline u64 get_jiffies_64(void)
         ((__s64)(a) - (__s64)(b) >= 0))
 #define time_before_eq64(a,b)  time_after_eq64(b,a)
 
+/*
+ * These four macros compare jiffies and 'a' for convenience.
+ */
+
+/* time_is_before_jiffies(a) return true if a is before jiffies */
+#define time_is_before_jiffies(a) time_after(jiffies, a)
+
+/* time_is_after_jiffies(a) return true if a is after jiffies */
+#define time_is_after_jiffies(a) time_before(jiffies, a)
+
+/* time_is_before_eq_jiffies(a) return true if a is before or equal to jiffies*/
+#define time_is_before_eq_jiffies(a) time_after_eq(jiffies, a)
+
+/* time_is_after_eq_jiffies(a) return true if a is after or equal to jiffies*/
+#define time_is_after_eq_jiffies(a) time_before_eq(jiffies, a)
+
 /*
  * Have the 32 bit jiffies value wrap 5 minutes after boot
  * so jiffies wrap bugs show up earlier.
@@ -154,7 +176,7 @@ extern unsigned long preset_lpj;
  * We want to do realistic conversions of time so we need to use the same
  * values the update wall clock code uses as the jiffies size.  This value
  * is: TICK_NSEC (which is defined in timex.h).  This
- * is a constant and is in nanoseconds.  We will used scaled math
+ * is a constant and is in nanoseconds.  We will use scaled math
  * with a set of scales defined here as SEC_JIFFIE_SC,  USEC_JIFFIE_SC and
  * NSEC_JIFFIE_SC.  Note that these defines contain nothing but
  * constants and so are computed at compile time.  SHIFT_HZ (computed in
@@ -198,7 +220,7 @@ extern unsigned long preset_lpj;
  * operator if the result is a long long AND at least one of the
  * operands is cast to long long (usually just prior to the "*" so as
  * not to confuse it into thinking it really has a 64-bit operand,
- * which, buy the way, it can do, but it take more code and at least 2
+ * which, buy the way, it can do, but it takes more code and at least 2
  * mpys).
 
  * We also need to be aware that one second in nanoseconds is only a