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[Qemu-devel] [PATCH 29/41] qemu-common: add QEMU_ALIGN_DOWN() and QEMU_A
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH 29/41] qemu-common: add QEMU_ALIGN_DOWN() and QEMU_ALIGN_UP() macros |
Date: |
Mon, 5 Dec 2011 15:21:06 +0100 |
From: Stefan Hajnoczi <address@hidden>
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>
Signed-off-by: Kevin Wolf <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
--
1.7.6.4
- [Qemu-devel] [PATCH 18/41] qcow2: Fix order in qcow2_snapshot_delete, (continued)
- [Qemu-devel] [PATCH 18/41] qcow2: Fix order in qcow2_snapshot_delete, Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 17/41] qcow2: Fix order of refcount updates in qcow2_snapshot_goto, Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 22/41] qed: convert to .bdrv_co_is_allocated(), Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 26/41] cow: convert to .bdrv_co_is_allocated(), Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 27/41] block: drop .bdrv_is_allocated() interface, Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 24/41] vvfat: convert to .bdrv_co_is_allocated(), Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 20/41] block: use public bdrv_is_allocated() interface, Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 23/41] block: convert qcow2, qcow2, and vmdk to .bdrv_co_is_allocated(), Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 21/41] block: add .bdrv_co_is_allocated(), Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 25/41] vdi: convert to .bdrv_co_is_allocated(), Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 29/41] qemu-common: add QEMU_ALIGN_DOWN() and QEMU_ALIGN_UP() macros,
Kevin Wolf <=
- [Qemu-devel] [PATCH 31/41] block: add request tracking, Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 30/41] coroutine: add qemu_co_queue_restart_all(), Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 28/41] block: add bdrv_co_is_allocated() interface, Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 32/41] block: add interface to toggle copy-on-read, Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 39/41] block: implement bdrv_co_is_allocated() boundary cases, Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 37/41] cow: use bdrv_co_is_allocated(), Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 35/41] block: core copy-on-read logic, Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 36/41] block: add -drive copy-on-read=on|off, Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 34/41] block: request overlap detection, Kevin Wolf, 2011/12/05
- [Qemu-devel] [PATCH 40/41] block: wait_for_overlapping_requests() deadlock detection, Kevin Wolf, 2011/12/05