Hello Mel Gorman,
The patch a486e00b8283: "mm: page_alloc: calculate classzone_idx once
from the zonelist ref" from May 17, 2014, leads to the following
static checker warning:
mm/page_alloc.c:2543 __alloc_pages_slowpath()
warn: we tested 'nodemask' before and it was 'false'
mm/page_alloc.c
2537 * Find the true preferred zone if the allocation is unconstrained by
2538 * cpusets.
2539 */
2540 if (!(alloc_flags & ALLOC_CPUSET) && !nodemask) {
^^^^^^^^^
Patch introduces this test.
2541 struct zoneref *preferred_zoneref;
2542 preferred_zoneref = first_zones_zonelist(zonelist, high_zoneidx,
2543 nodemask ? : &cpuset_current_mems_allowed,
^^^^^^^^
Patch introduces this test as well.
2544 &preferred_zone);
2545 classzone_idx = zonelist_zone_idx(preferred_zoneref);
2546 }
regards,
dan carpenter
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