mm: make page pfmemalloc check more robust

[uclinux-h8/linux.git] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index beda417..5b5240b 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1343,12 +1343,15 @@ static int prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags,
        set_page_owner(page, order, gfp_flags);
 
        /*
-        * page->pfmemalloc is set when ALLOC_NO_WATERMARKS was necessary to
+        * page is set pfmemalloc when ALLOC_NO_WATERMARKS was necessary to
         * allocate the page. The expectation is that the caller is taking
         * steps that will free more memory. The caller should avoid the page
         * being used for !PFMEMALLOC purposes.
         */
-       page->pfmemalloc = !!(alloc_flags & ALLOC_NO_WATERMARKS);
+       if (alloc_flags & ALLOC_NO_WATERMARKS)
+               set_page_pfmemalloc(page);
+       else
+               clear_page_pfmemalloc(page);
 
        return 0;
 }
@@ -3345,7 +3348,7 @@ refill:
                atomic_add(size - 1, &page->_count);
 
                /* reset page count bias and offset to start of new frag */
-               nc->pfmemalloc = page->pfmemalloc;
+               nc->pfmemalloc = page_is_pfmemalloc(page);
                nc->pagecnt_bias = size;
                nc->offset = size;
        }
@@ -5060,6 +5063,10 @@ static unsigned long __meminit zone_spanned_pages_in_node(int nid,
 {
        unsigned long zone_start_pfn, zone_end_pfn;
 
+       /* When hotadd a new node, the node should be empty */
+       if (!node_start_pfn && !node_end_pfn)
+               return 0;
+
        /* Get the start and end of the zone */
        zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type];
        zone_end_pfn = arch_zone_highest_possible_pfn[zone_type];
@@ -5123,6 +5130,10 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
        unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type];
        unsigned long zone_start_pfn, zone_end_pfn;
 
+       /* When hotadd a new node, the node should be empty */
+       if (!node_start_pfn && !node_end_pfn)
+               return 0;
+
        zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high);
        zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high);