linux-kernel - Re: [Xen-devel] [PATCH v2] xen: add new hypercall buffer mapping device

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Date:   Mon, 18 Jun 2018 16:18:22 +0800
From:   Andrew Cooper <andrew.cooper3@...rix.com>
To:     Juergen Gross <jgross@...e.com>, <linux-kernel@...r.kernel.org>,
        <xen-devel@...ts.xenproject.org>
CC:     <boris.ostrovsky@...cle.com>
Subject: Re: [Xen-devel] [PATCH v2] xen: add new hypercall buffer mapping
 device

On 18/06/18 15:36, Juergen Gross wrote:
> +static int privcmd_buf_mmap(struct file *file, struct vm_area_struct *vma)
> +{
> +	struct privcmd_buf_private *file_priv = file->private_data;
> +	struct privcmd_buf_vma_private *vma_priv;
> +	unsigned long count = vma_pages(vma);
> +	unsigned int i;
> +	int ret = 0;
> +
> +	if (!(vma->vm_flags & VM_SHARED) || count > (unsigned long)limit ||

You don't need the unsigned long cast, as limit will be promoted
automatically.

Otherwise, LGTM.

~Andrew