4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mark Rutland <mark.rutland at arm.com>
commit 5da889c795b1fbefc9d8f058b54717ab8ab17891 upstream.
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 at arm.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: Michael S. Tsirkin <mst at redhat.com>
Cc: linux-kernel at vger.kernel.org
Cc: virtualization at lists.linux-foundation.org
Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck at de.ibm.com>
Reviewed-by: Jason Wang <jasowang at redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
tools/virtio/linux/compiler.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/virtio/linux/compiler.h
+++ b/tools/virtio/linux/compiler.h
@@ -4,6 +4,6 @@
#define WRITE_ONCE(var, val) \
(*((volatile typeof(val) *)(&(var))) = (val))
-#define READ_ONCE(var) (*((volatile typeof(val) *)(&(var))))
+#define READ_ONCE(var) (*((volatile typeof(var) *)(&(var))))
#endif
