8/10
----------------------------
commit fb98c1445304e87021a7514018fe6fe24f4893b2
Author: Jaren Johnston <jaren's email>
Date: Fri Jun 8 15:49:01 2012 -0700
Fix PAGECOUNT when buf == buflen == 0
Change-Id: I7f5d5eccaf8fdcbb5ee11c56e2f96f5c4a34615b
diff --git a/zc.h b/zc.h
index 7577677..a98e60d 100644
--- a/zc.h
+++ b/zc.h
@@ -16,10 +16,11 @@ int get_userbuf(struct csession *ses,
struct scatterlist **src_sg,
struct scatterlist **dst_sg);
-/* last page - first page + 1 */
-#define PAGECOUNT(buf, buflen) \
- ((((unsigned long)(buf + buflen - 1) & PAGE_MASK) >>
PAGE_SHIFT) - \
- (((unsigned long) buf & PAGE_MASK) >>
PAGE_SHIFT) + 1)
+/* buflen ? (last page - first page + 1) : 0 */
+#define PAGECOUNT(buf, buflen) ((buflen) \
+ ? ((((unsigned long)(buf + buflen - 1)) >> PAGE_SHIFT) - \
+ (((unsigned long)(buf )) >> PAGE_SHIFT) + 1) \
+ : 0)
#define DEFAULT_PREALLOC_PAGES 32
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