Merge branch 'akpm' (patches from Andrew)

Merge updates from Andrew Morton:

 - a few misc things

 - a few Y2038 fixes

 - ntfs fixes

 - arch/sh tweaks

 - ocfs2 updates

 - most of MM

* emailed patches from Andrew Morton <[email protected]>: (111 commits)
  mm/hmm.c: remove unused variables align_start and align_end
  fs/userfaultfd.c: remove redundant pointer uwq
  mm, vmacache: hash addresses based on pmd
  mm/list_lru: introduce list_lru_shrink_walk_irq()
  mm/list_lru.c: pass struct list_lru_node* as an argument to __list_lru_walk_one()
  mm/list_lru.c: move locking from __list_lru_walk_one() to its caller
  mm/list_lru.c: use list_lru_walk_one() in list_lru_walk_node()
  mm, swap: make CONFIG_THP_SWAP depend on CONFIG_SWAP
  mm/sparse: delete old sparse_init and enable new one
  mm/sparse: add new sparse_init_nid() and sparse_init()
  mm/sparse: move buffer init/fini to the common place
  mm/sparse: use the new sparse buffer functions in non-vmemmap
  mm/sparse: abstract sparse buffer allocations
  mm/hugetlb.c: don't zero 1GiB bootmem pages
  mm, page_alloc: double zone's batchsize
  mm/oom_kill.c: document oom_lock
  mm/hugetlb: remove gigantic page support for HIGHMEM
  mm, oom: remove sleep from under oom_lock
  kernel/dma: remove unsupported gfp_mask parameter from dma_alloc_from_contiguous()
  mm/cma: remove unsupported gfp_mask parameter from cma_alloc()
  ...

1 files changed, 16 insertions, 17 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0922ef5d2e46..15ea511fb41c 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4165,11 +4165,12 @@ retry:
 		alloc_flags = reserve_flags;
 
 	/*
-	 * Reset the zonelist iterators if memory policies can be ignored.
-	 * These allocations are high priority and system rather than user
-	 * orientated.
+	 * Reset the nodemask and zonelist iterators if memory policies can be
+	 * ignored. These allocations are high priority and system rather than
+	 * user oriented.
 	 */
 	if (!(alloc_flags & ALLOC_CPUSET) || reserve_flags) {
+		ac->nodemask = NULL;
 		ac->preferred_zoneref = first_zones_zonelist(ac->zonelist,
 					ac->high_zoneidx, ac->nodemask);
 	}
@@ -4403,19 +4404,15 @@ out:
 EXPORT_SYMBOL(__alloc_pages_nodemask);
 
 /*
- * Common helper functions.
+ * Common helper functions. Never use with __GFP_HIGHMEM because the returned
+ * address cannot represent highmem pages. Use alloc_pages and then kmap if
+ * you need to access high mem.
  */
 unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order)
 {
 	struct page *page;
 
-	/*
-	 * __get_free_pages() returns a virtual address, which cannot represent
-	 * a highmem page
-	 */
-	VM_BUG_ON((gfp_mask & __GFP_HIGHMEM) != 0);
-
-	page = alloc_pages(gfp_mask, order);
+	page = alloc_pages(gfp_mask & ~__GFP_HIGHMEM, order);
 	if (!page)
 		return 0;
 	return (unsigned long) page_address(page);
@@ -5567,13 +5564,12 @@ static int zone_batchsize(struct zone *zone)
 
 	/*
 	 * The per-cpu-pages pools are set to around 1000th of the
-	 * size of the zone.  But no more than 1/2 of a meg.
-	 *
-	 * OK, so we don't know how big the cache is.  So guess.
+	 * size of the zone.
 	 */
 	batch = zone->managed_pages / 1024;
-	if (batch * PAGE_SIZE > 512 * 1024)
-		batch = (512 * 1024) / PAGE_SIZE;
+	/* But no more than a meg. */
+	if (batch * PAGE_SIZE > 1024 * 1024)
+		batch = (1024 * 1024) / PAGE_SIZE;
 	batch /= 4;		/* We effectively *= 4 below */
 	if (batch < 1)
 		batch = 1;
@@ -6405,8 +6401,11 @@ void __paginginit zero_resv_unavail(void)
 	pgcnt = 0;
 	for_each_resv_unavail_range(i, &start, &end) {
 		for (pfn = PFN_DOWN(start); pfn < PFN_UP(end); pfn++) {
-			if (!pfn_valid(ALIGN_DOWN(pfn, pageblock_nr_pages)))
+			if (!pfn_valid(ALIGN_DOWN(pfn, pageblock_nr_pages))) {
+				pfn = ALIGN_DOWN(pfn, pageblock_nr_pages)
+					+ pageblock_nr_pages - 1;
 				continue;
+			}
 			mm_zero_struct_page(pfn_to_page(pfn));
 			pgcnt++;
 		}