OpenCloudOS-Kernel/tools/virtio/linux/compiler.h

#ifndef LINUX_COMPILER_H
#define LINUX_COMPILER_H

#define WRITE_ONCE(var, val) \
	(*((volatile typeof(val) *)(&(var))) = (val))

#define READ_ONCE(var) (*((volatile typeof(var) *)(&(var))))

#endif
tools/virtio: use virt_xxx barriers Fix build after API changes. Reported-by: Kamal Mostafa <kamal@canonical.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> 2016-01-21 03:12:58 +08:00			`#ifndef LINUX_COMPILER_H`
			`#define LINUX_COMPILER_H`

			`#define WRITE_ONCE(var, val) \`
			`(((volatile typeof(val) )(&(var))) = (val))`

tools/virtio: fix READ_ONCE() The virtio tools implementation of READ_ONCE() has a single parameter called 'var', but erroneously refers to 'val' for its cast, and thus won't work unless there's a variable of the correct type that happens to be called 'var'. Fix this with s/var/val/, making READ_ONCE() work as expected regardless. Fixes: a7c490333df3cff5 ("tools/virtio: use virt_xxx barriers") Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: linux-kernel@vger.kernel.org Cc: virtualization@lists.linux-foundation.org Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Jason Wang <jasowang@redhat.com> 2016-11-24 18:25:12 +08:00			`#define READ_ONCE(var) (((volatile typeof(var) )(&(var))))`
tools/virtio: use virt_xxx barriers Fix build after API changes. Reported-by: Kamal Mostafa <kamal@canonical.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> 2016-01-21 03:12:58 +08:00
			`#endif`