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[Qemu-devel] [PATCH v4 1/8] qemu-common: add QEMU_ALIGN_DOWN() and QEMU_
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH v4 1/8] qemu-common: add QEMU_ALIGN_DOWN() and QEMU_ALIGN_UP() macros |
Date: |
Wed, 23 Nov 2011 11:47:51 +0000 |
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 <address@hidden>
---
qemu-common.h | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/qemu-common.h b/qemu-common.h
index 2ce47aa..44870fe 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
--
1.7.7.1
- [Qemu-devel] [PATCH v4 0/8] block: generic copy-on-read, Stefan Hajnoczi, 2011/11/23
- [Qemu-devel] [PATCH v4 8/8] block: add -drive copy-on-read=on|off, Stefan Hajnoczi, 2011/11/23
- [Qemu-devel] [PATCH v4 5/8] block: wait for overlapping requests, Stefan Hajnoczi, 2011/11/23
- [Qemu-devel] [PATCH v4 7/8] block: core copy-on-read logic, Stefan Hajnoczi, 2011/11/23
- [Qemu-devel] [PATCH v4 6/8] block: request overlap detection, Stefan Hajnoczi, 2011/11/23
- [Qemu-devel] [PATCH v4 1/8] qemu-common: add QEMU_ALIGN_DOWN() and QEMU_ALIGN_UP() macros,
Stefan Hajnoczi <=
- [Qemu-devel] [PATCH v4 4/8] block: add bdrv_set_copy_on_read(), Stefan Hajnoczi, 2011/11/23
- [Qemu-devel] [PATCH v4 3/8] block: add request tracking, Stefan Hajnoczi, 2011/11/23
- [Qemu-devel] [PATCH v4 2/8] coroutine: add qemu_co_queue_restart_all(), Stefan Hajnoczi, 2011/11/23