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add a header file for atomic operations

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We're already using them in several places, but __sync builtins are just
too ugly to type, and do not provide seqcst load/store operations.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-05-13 13:29:47 +02:00
parent 22fc860b0a
commit 5444e768ee
6 changed files with 531 additions and 46 deletions
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9
hw/virtio/vhost.c
View file

@ -16,6 +16,7 @@
#include <sys/ioctl.h>
#include "hw/virtio/vhost.h"
#include "hw/hw.h"
#include "qemu/atomic.h"
#include "qemu/range.h"
#include <linux/vhost.h>
#include "exec/address-spaces.h"
@ -47,11 +48,9 @@ static void vhost_dev_sync_region(struct vhost_dev *dev,
addr += VHOST_LOG_CHUNK;
continue;
}
/* Data must be read atomically. We don't really
* need the barrier semantics of __sync
* builtins, but it's easier to use them than
* roll our own. */
log = __sync_fetch_and_and(from, 0);
/* Data must be read atomically. We don't really need barrier semantics
* but it's easier to use atomic_* than roll our own. */
log = atomic_xchg(from, 0);
while ((bit = sizeof(log) > sizeof(int) ?
ffsll(log) : ffs(log))) {
hwaddr page_addr;