aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorStefan Hajnoczi <stefanha@linux.vnet.ibm.com>2011-11-17 13:40:25 +0000
committerKevin Wolf <kwolf@redhat.com>2011-12-05 14:51:37 +0100
commit3951690a4a29e031492090131d001e5047938631 (patch)
tree25204de77bfa6f3333c5af2e4861021ac6727abc
parent060f51c9dee3c58e2748c773ef1f7142047a4a2f (diff)
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>
-rw-r--r--qemu-common.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/qemu-common.h b/qemu-common.h
index 2ce47aa12..44870fe52 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -341,6 +341,12 @@ static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
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