hugetlb: add phys addr to struct huge_bootmem_page

This is needed on HIGHMEM systems - we don't always have a virtual
address so store the physical address and map it in as needed.

[akpm@linux-foundation.org: cleanup]
Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index bfcf153bc829..c6d342d313c7 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1105,8 +1105,16 @@ static void __init gather_bootmem_prealloc(void)
         struct huge_bootmem_page *m;
 
         list_for_each_entry(m, &huge_boot_pages, list) {
-                struct page *page = virt_to_page(m);
                 struct hstate *h = m->hstate;
+                struct page *page;
+
+#ifdef CONFIG_HIGHMEM
+                page = pfn_to_page(m->phys >> PAGE_SHIFT);
+                free_bootmem_late((unsigned long)m,
+                                  sizeof(struct huge_bootmem_page));
+#else
+                page = virt_to_page(m);
+#endif
                 __ClearPageReserved(page);
                 WARN_ON(page_count(page) != 1);
                 prep_compound_huge_page(page, h->order);