Re: [Xen-devel] [PATCHv2 2/3] mm: don't free pages until mm locks are released

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.11.15 at 19:49, <david.vrabel@xxxxxxxxxx> wrote:
> @@ -2805,6 +2806,9 @@ int p2m_add_foreign(struct domain *tdom, unsigned long 
> fgfn,
>      prev_mfn = mfn_x(get_gfn(tdom, gpfn, &p2mt_prev));
>      if ( mfn_valid(_mfn(prev_mfn)) )
>      {
> +        prev_page = mfn_to_page(_mfn(prev_mfn));
> +        get_page(prev_page, tdom);

If you're absolutely sure that this can never fail, then still at the very
least this imo should be documented by a respective ASSERT() (or
ASSERT_UNREACHABLE()).

Jan


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