X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Fproportions.h;h=5afc1b23346d1f04536ea9339c1790b1cceeef3a;hb=2a5f2e3e6cd1ce9fb3f8b186b6bc9aa1f1497a92;hp=2c3b3cad92bec050b18605cffe39784f774f09d0;hpb=4c5cdb1e1f2a502069f57a60b5c6b97b8106c73c;p=linux-2.6

diff --git a/include/linux/proportions.h b/include/linux/proportions.h
index 2c3b3cad92..5afc1b2334 100644
--- a/include/linux/proportions.h
+++ b/include/linux/proportions.h
@@ -77,6 +77,19 @@ void prop_inc_percpu(struct prop_descriptor *pd, struct prop_local_percpu *pl)
 	local_irq_restore(flags);
 }
 
+/*
+ * Limit the time part in order to ensure there are some bits left for the
+ * cycle counter and fraction multiply.
+ */
+#define PROP_MAX_SHIFT (3*BITS_PER_LONG/4)
+
+#define PROP_FRAC_SHIFT		(BITS_PER_LONG - PROP_MAX_SHIFT - 1)
+#define PROP_FRAC_BASE		(1UL << PROP_FRAC_SHIFT)
+
+void __prop_inc_percpu_max(struct prop_descriptor *pd,
+			   struct prop_local_percpu *pl, long frac);
+
+
 /*
  * ----- SINGLE ------
  */