From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Tue, 24 Feb 2015 15:19:14 +0000 (+0100)
Subject: Add minor comment
X-Git-Tag: v1.5.0~12
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e63974471c4e2f11781cda163e0dc2ac6fb72f9;p=thirdparty%2Fbird.git

Add minor comment
---

diff --git a/lib/birdlib.h b/lib/birdlib.h
index d107c3999..94054769f 100644
--- a/lib/birdlib.h
+++ b/lib/birdlib.h
@@ -33,6 +33,10 @@
 #define ABS(a)   ((a)>=0 ? (a) : -(a))
 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(*(a)))
 
+
+/* Bitfield macros */
+
+/* b is u32 array (or ptr), l is size of it in bits (multiple of 32), p is 0..(l-1) */
 #define BIT32_VAL(p)		(((u32) 1) << ((p) % 32))
 #define BIT32_TEST(b,p)		((b)[(p)/32] & BIT32_VAL(p))
 #define BIT32_SET(b,p)		((b)[(p)/32] |= BIT32_VAL(p))