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    SubjectRe: [PATCH v2 repost 3/7] mm: add a function to get the max pfn
    On Wed, Jul 27, 2016 at 09:23:32AM +0800, Liang Li wrote:
    > Expose the function to get the max pfn, so it can be used in the
    > virtio-balloon device driver.
    >
    > Signed-off-by: Liang Li <liang.z.li@intel.com>
    > Cc: Andrew Morton <akpm@linux-foundation.org>
    > Cc: Vlastimil Babka <vbabka@suse.cz>
    > Cc: Mel Gorman <mgorman@techsingularity.net>
    > Cc: Michael S. Tsirkin <mst@redhat.com>
    > Cc: Paolo Bonzini <pbonzini@redhat.com>
    > Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
    > Cc: Amit Shah <amit.shah@redhat.com>
    > ---
    > mm/page_alloc.c | 6 ++++++
    > 1 file changed, 6 insertions(+)
    >
    > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
    > index 8b3e134..7da61ad 100644
    > --- a/mm/page_alloc.c
    > +++ b/mm/page_alloc.c
    > @@ -4517,6 +4517,12 @@ void show_free_areas(unsigned int filter)
    > show_swap_cache_info();
    > }
    >
    > +unsigned long get_max_pfn(void)
    > +{
    > + return max_pfn;
    > +}
    > +EXPORT_SYMBOL(get_max_pfn);
    > +


    This needs a coment that this can change at any time.
    So it's only good as a hint e.g. for sizing data structures.

    > static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref)
    > {
    > zoneref->zone = zone;
    > --
    > 1.9.1

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