linux-kernel - [PATCH 4.9 41/59] tools/virtio: fix READ

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Message-Id: <20170113113840.930471458@linuxfoundation.org>
Date:   Fri, 13 Jan 2017 13:01:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        Cornelia Huck <cornelia.huck@...ibm.com>
Subject: [PATCH 4.9 41/59] tools/virtio: fix READ_ONCE()

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mark Rutland <mark.rutland@....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@....com>
Cc: Jason Wang <jasowang@...hat.com>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: linux-kernel@...r.kernel.org
Cc: virtualization@...ts.linux-foundation.org
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@...ibm.com>
Reviewed-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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