On (01/05/16 18:56), Jungseung Lee wrote:
[..]

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#ifdef CONFIG_HIGHMEM
static inline void free_area_high(unsigned long pfn, unsigned long
end)  {
-      for (; pfn < end; pfn++)
-              free_highmem_page(pfn_to_page(pfn));
+      while (pfn < end) {
+              struct page *page = pfn_to_page(pfn);
+              unsigned long order = min(__ffs(pfn), MAX_ORDER - 1);
+              unsigned long nr_pages = 1 << order;
+              unsigned long rem = end - pfn;
+
+              if (nr_pages > rem) {
+                      order = __fls(rem);
+                      nr_pages = 1 << order;
+              }
+
+              __free_pages_bootmem(page, order);
+              totalram_pages += nr_pages;
+              totalhigh_pages += nr_pages;

+			page_zone(page)->managed_pages += nr_pages;  ???

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+              pfn += nr_pages;
+      }
}

	-ss