On 10/10/2016 03:23 PM, Mark Cave-Ayland wrote:
On 10/10/16 17:34, Eric Blake wrote:
On 10/09/2016 11:43 AM, Mark Cave-Ayland wrote:
The hard-coded default alignment is BDRV_SECTOR_SIZE, however this is not
necessarily the case for all platforms. Use this as the default alignment for
all current callers.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk>
---
@@ -160,8 +161,8 @@ static void dma_blk_cb(void *opaque, int ret)
return;
}
- if (dbs->iov.size & ~BDRV_SECTOR_MASK) {
- qemu_iovec_discard_back(&dbs->iov, dbs->iov.size & ~BDRV_SECTOR_MASK);
+ if (dbs->iov.size & (dbs->align - 1)) {
+ qemu_iovec_discard_back(&dbs->iov, dbs->iov.size & (dbs->align - 1));
Would it be any smarter to use osdep.h's QEMU_IS_ALIGNED(dbs->iov.size,
dbs->align) and QEMU_ALIGN_DOWN(dbs->iov.size, dbs->align)?
Semantically it is the same, but the macros make it obvious what the
bit-twiddling is doing.
Unless you think that needs a tweak,
Reviewed-by: Eric Blake <ebl...@redhat.com>
I can't say I feel too strongly about it since there are plenty of other
examples of this style in the codebase, so I'm happy to go with whatever
John/Paolo are most happy with.
ATB,
Mark.
I can't pretend I am consistent, but when in doubt use the macro. Not
worth a respin IMO, but I think this falls out of my jurisdiction :)
Acked-by: John Snow <js...@redhat.com>
