qemu-common: add QEMU_ALIGN_DOWN() and QEMU_ALIGN_UP() macros
Add macros for aligning a number to a multiple, for example:
QEMU_ALIGN_DOWN(500, 2000) = 0
QEMU_ALIGN_UP(500, 2000) = 2000
Since ALIGN_UP() is a common macro name use the QEMU_* namespace prefix.
Hopefully this will protect us from included headers that leak something
with a similar name.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/qemu-common.h b/qemu-common.h
index 2ce47aa..44870fe52 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -341,6 +341,12 @@
return res.ll;
}
+/* Round number down to multiple */
+#define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
+
+/* Round number up to multiple */
+#define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
+
#include "module.h"
#endif
