struct zoneref *next_zones_zonelist(struct zoneref *z,
enum zone_type highest_zoneidx,
nodemask_t *nodes,
struct zone **zone)
{
if (likely(nodes == NULL))
while (zonelist_zone_idx(z) > highest_zoneidx)
z++;
else
while (zonelist_zone_idx(z) > highest_zoneidx ||
(z->zone && !zref_in_nodemask(z, nodes)))
z++;
*zone = zonelist_zone(z);
return z;
}
/* Returns the next zone at or below highest_zoneidx in a zonelist */
struct zoneref *next_zones_zonelist(struct zoneref *z,
enum zone_type highest_zoneidx,
nodemask_t *nodes,
struct zone **zone)
{
/*
* Find the next suitable zone to use for the allocation.
* Only filter based on nodemask if it's set
*/
if (likely(nodes == NULL))
while (zonelist_zone_idx(z) > highest_zoneidx)
z++;
else
while (zonelist_zone_idx(z) > highest_zoneidx ||
(z->zone && !zref_in_nodemask(z, nodes)))
z++;
*zone = zonelist_zone(z++);
return z;
}
// ARM10C 20140308
// zonelist->_zonerefs: contig_page_data->node_zonelists->_zonerefs
// highest_zoneidx: 0, nodes: 0, &zone
// ARM10C 20140426
// zonelist->_zonerefs: contig_page_data->node_zonelists->_zonerefs
// highest_zoneidx: 0, nodes: &node_states[N_HIGH_MEMORY], zone: &preferred_zone
struct zoneref *next_zones_zonelist(struct zoneref *z,
enum zone_type highest_zoneidx,
nodemask_t *nodes,
struct zone **zone)
{
/*
* Find the next suitable zone to use for the allocation.
* Only filter based on nodemask if it's set
*/
// nodes: 0
// ARM10C 20140426
// nodes: &node_states[N_HIGH_MEMORY]
if (likely(nodes == NULL))
// z: contig_page_data->node_zonelists->_zonerefs[0], highest_zoneidx: 0
// z: contig_page_data->node_zonelists->_zonerefs[1], highest_zoneidx: 0
// [2nd] zonelist_zone_idx(z): 0
while (zonelist_zone_idx(z) > highest_zoneidx)
// [1st] zonelist_zone_idx(z): 1
z++;
// [1st] z: contig_page_data->node_zonelists->_zonerefs[1]
else
// ARM10C 20140426
// z: contig_page_data->node_zonelists->_zonerefs, zonelist_zone_idx(z): 1
// highest_zoneidx: 0
while (zonelist_zone_idx(z) > highest_zoneidx ||
(z->zone && !zref_in_nodemask(z, nodes)))
z++;
// z: contig_page_data->node_zonelists->_zonerefs[1]
*zone = zonelist_zone(z);
// zone: contig_page_data->node_zones[0]
// z: contig_page_data->node_zonelists->_zonerefs[1]
return z;
// return contig_page_data->node_zonelists->_zonerefs[1]
}