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>

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 59225ef27d15062813e4799ad95e6df2f57241be..19644e0016bdbb4837e1fa8f28cd276797fd00a4 100644 (file)
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -231,6 +231,9 @@ struct hstate {
 struct huge_bootmem_page {
        struct list_head list;
        struct hstate *hstate;
+#ifdef CONFIG_HIGHMEM
+       phys_addr_t phys;
+#endif
 };
 
 struct page *alloc_huge_page_node(struct hstate *h, int nid);

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index bfcf153bc82907f31ccc1921256622a82bf20d2f..c6d342d313c78be584ed521e575745803dfb0828 100644 (file)
--- 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);