Re: [Xen-devel] bogus wrap check in xen-netback

[Olaf Hering]

Am Wed, 25 Apr 2018 09:28:38 +0200
schrieb Juergen Gross <jgr...@suse.com>:

> Why? (u16)0 - (u16)65400 == 136

My helloworld.c shows that ushort gets promoted to uint, unless it is done like 
that:

-               if (queue->tx.sring->req_prod - queue->tx.req_cons >
-                   XEN_NETIF_TX_RING_SIZE) {
+               idx = queue->tx.sring->req_prod - queue->tx.req_cons; 
+               if ( idx > XEN_NETIF_TX_RING_SIZE) {

Olaf

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