Changeset 00aece0 in mainline for kernel/generic/include/macros.h

Timestamp:

2012-02-18T16:47:38Z (13 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

4449c6c

Parents:

bd5f3b7 (diff), f943dd3 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge mainline changes.

File:

• kernel/generic/include/macros.h (modified) (1 diff)

kernel/generic/include/macros.h

@@ -69 +69 @@
     uint64_t sz2)
 {
-        uint64_t e1 = s1 + sz1;
-        uint64_t e2 = s2 + sz2;
-        
+        uint64_t e1;
+        uint64_t e2;
+
+        /* Handle the two corner cases when either sz1 or sz2 are zero. */
+        if (sz1 == 0)
+                return (s1 == s2) && (sz2 == 0);
+        e1 = s1 + sz1 - 1;      
+        if (sz2 == 0)
+                return (s1 <= s2) && (s2 <= e1);
+        e2 = s2 + sz2 - 1;
+
+        /* e1 and e2 are end addresses, the sum is imune to overflow */
         return ((s1 <= s2) && (e1 >= e2));
 }
 
 #endif /* __ASM__ */
+
+#define ispwr2(x)       (((x) & ((x) - 1)) == 0)
 
 #define isdigit(d)     (((d) >= '0') && ((d) <= '9'))