linux-kernel - Re: [PATCH RFC 1/5] vringfd syscall

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Message-ID: <47FD18C5.6040709@goop.org>
Date:	Wed, 09 Apr 2008 14:28:05 -0500
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Max Krasnyansky <maxk@...lcomm.com>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH RFC 1/5] vringfd syscall

Rusty Russell wrote:
> +asmlinkage long sys_vringfd(void __user *addr,
> +			    unsigned num_descs,
> +			    u16 __user *last_used)
> +{
> +	int fd, err;
> +	struct file *filp;
> +	struct vring_info *vr;
> +
> +	/* Must be a power of two, and representable by u16 */
> +	if (!num_descs || (num_descs & (num_descs-1)) || num_descs > 65536) {
>   

65536 doesn't fit in u16.

    J
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