Re: [Xen-devel] [PATCH V3 3/8] xen: Delay m2p_override initialization

[David Vrabel <david.vrabel@citrix.com>]

On 11/11/14 05:43, Juergen Gross wrote:
> The m2p overrides are used to be able to find the local pfn for a
> foreign mfn mapped into the domain. They are used by driver backends
> having to access frontend data.
> 
> As this functionality isn't used in early boot it makes no sense to
> initialize the m2p override functions very early. It can be done
> later without doing any harm, removing the need for allocating memory
> via extend_brk().
> 
> While at it make some m2p override functions static as they are only
> used internally.

Reviewed-by: David Vrabel <david.vrabel@citrix.com>

But...

>  static struct page *m2p_find_override(unsigned long mfn)
>  {
>  	unsigned long flags;
> -	struct list_head *bucket = &m2p_overrides[mfn_hash(mfn)];
> +	struct list_head *bucket;
>  	struct page *p, *ret;


    if (unlikely(!m2p_overrides))
        return NULL;

Would be preferred,

David