Despite living under drivers/ vringh.c is also used as part of the userspace
virtio tools. Before we can kill off the ACCESS_ONCE()definition in the tools,
we must convert vringh.c to use {READ,WRITE}_ONCE().
This patch does so, along with the required include of <linux/compiler.h> for
the relevant definitions. The userspace tools provide their own definitions in
their own <linux/compiler.h>.
Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
---
drivers/vhost/vringh.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c
index 3bb02c6..bb8971f 100644
--- a/drivers/vhost/vringh.c
+++ b/drivers/vhost/vringh.c
@@ -3,6 +3,7 @@
*
* Since these may be in userspace, we use (inline) accessors.
*/
+#include <linux/compiler.h>
#include <linux/module.h>
#include <linux/vringh.h>
#include <linux/virtio_ring.h>
@@ -820,13 +821,13 @@ EXPORT_SYMBOL(vringh_need_notify_user);
static inline int getu16_kern(const struct vringh *vrh,
u16 *val, const __virtio16 *p)
{
- *val = vringh16_to_cpu(vrh, ACCESS_ONCE(*p));
+ *val = vringh16_to_cpu(vrh, READ_ONCE(*p));
return 0;
}
static inline int putu16_kern(const struct vringh *vrh, __virtio16 *p, u16 val)
{
- ACCESS_ONCE(*p) = cpu_to_vringh16(vrh, val);
+ WRITE_ONCE(*p, cpu_to_vringh16(vrh, val));
return 0;
}
--
2.7.4
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