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| author | Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> | 2011-11-17 13:40:25 +0000 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2011-12-05 14:51:37 +0100 |
| commit | 3951690a4a29e031492090131d001e5047938631 (patch) | |
| tree | 25204de77bfa6f3333c5af2e4861021ac6727abc | |
| parent | 060f51c9dee3c58e2748c773ef1f7142047a4a2f (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.h | 6 |
1 files changed, 6 insertions, 0 deletions
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 |