hugetlb: add phys addr to struct huge_bootmem_page
Becky Bruce [Tue, 26 Jul 2011 00:11:50 +0000 (17:11 -0700)]
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>

include/linux/hugetlb.h
mm/hugetlb.c

index 59225ef..19644e0 100644 (file)
@@ -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);
index bfcf153..c6d342d 100644 (file)
@@ -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);