From: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Date: Thu, 17 Nov 2011 13:40:25 +0000 (+0000)
Subject: qemu-common: add QEMU_ALIGN_DOWN() and QEMU_ALIGN_UP() macros
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3951690a4a29e031492090131d001e5047938631;p=qemu.git

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 2ce47aa12d..44870fe523 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