From: Wei Liu <wei.liu2@citrix.com>
To: Olaf Hering <olaf@aepfle.de>
Cc: Juergen Gross <jgross@suse.com>,
xen-devel@lists.xenproject.org,
Paul Durrant <paul.durrant@citrix.com>,
Wei Liu <wei.liu2@citrix.com>
Subject: Re: bogus wrap check in xen-netback
Date: Wed, 25 Apr 2018 09:59:23 +0100 [thread overview]
Message-ID: <20180425085923.k6bxc5j4nhoadhzl@citrix.com> (raw)
In-Reply-To: <20180425093924.13c56296.olaf@aepfle.de>
On Wed, Apr 25, 2018 at 09:39:24AM +0200, Olaf Hering wrote:
> Am Wed, 25 Apr 2018 09:28:38 +0200
> schrieb Juergen Gross <jgross@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) {
Do you have the full diff of your changes? I don't follow why integer
conversion works differently if you write the code like this. As far as
I can tell the type of LHS didn't change.
Wei.
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next prev parent reply other threads:[~2018-04-25 8:59 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-25 7:19 bogus wrap check in xen-netback Olaf Hering
2018-04-25 7:28 ` Juergen Gross
2018-04-25 7:39 ` Olaf Hering
2018-04-25 8:59 ` Wei Liu [this message]
2018-04-25 9:04 ` Olaf Hering
2018-04-25 9:48 ` Jan Beulich
2018-04-25 10:06 ` Wei Liu
2018-04-25 10:26 ` Jan Beulich
2018-04-25 10:31 ` Wei Liu
2018-04-25 10:35 ` Olaf Hering
2018-04-25 10:47 ` Wei Liu
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