[PATCH] i386/x86-64: Consolidate arch/{i386,x86_64}/boot/compressed/misc.c

[safe/jmp/linux-2.6] / arch / i386 / mm / pageattr.c

diff --git a/arch/i386/mm/pageattr.c b/arch/i386/mm/pageattr.c
index c30a16d..0887b34 100644 (file)
--- a/arch/i386/mm/pageattr.c
+++ b/arch/i386/mm/pageattr.c
@@ -51,6 +51,13 @@ static struct page *split_large_page(unsigned long address, pgprot_t prot,
        if (!base) 
                return NULL;
 
+       /*
+        * page_private is used to track the number of entries in
+        * the page table page that have non standard attributes.
+        */
+       SetPagePrivate(base);
+       page_private(base) = 0;
+
        address = __pa(address);
        addr = address & LARGE_PAGE_MASK; 
        pbase = (pte_t *)page_address(base);
@@ -143,11 +150,12 @@ __change_page_attr(struct page *page, pgprot_t prot)
                                return -ENOMEM;
                        set_pmd_pte(kpte,address,mk_pte(split, ref_prot));
                        kpte_page = split;
-               }       
-               get_page(kpte_page);
+               }
+               page_private(kpte_page)++;
        } else if ((pte_val(*kpte) & _PAGE_PSE) == 0) { 
                set_pte_atomic(kpte, mk_pte(page, PAGE_KERNEL));
-               __put_page(kpte_page);
+               BUG_ON(page_private(kpte_page) == 0);
+               page_private(kpte_page)--;
        } else
                BUG();
 
@@ -157,10 +165,8 @@ __change_page_attr(struct page *page, pgprot_t prot)
         * replace it with a largepage.
         */
        if (!PageReserved(kpte_page)) {
-               /* memleak and potential failed 2M page regeneration */
-               BUG_ON(!page_count(kpte_page));
-
-               if (cpu_has_pse && (page_count(kpte_page) == 1)) {
+               if (cpu_has_pse && (page_private(kpte_page) == 0)) {
+                       ClearPagePrivate(kpte_page);
                        list_add(&kpte_page->lru, &df_list);
                        revert_page(kpte_page, address);
                }
@@ -203,25 +209,29 @@ int change_page_attr(struct page *page, int numpages, pgprot_t prot)
 }
 
 void global_flush_tlb(void)
-{ 
-       LIST_HEAD(l);
+{
+       struct list_head l;
        struct page *pg, *next;
 
        BUG_ON(irqs_disabled());
 
        spin_lock_irq(&cpa_lock);
-       list_splice_init(&df_list, &l);
+       list_replace_init(&df_list, &l);
        spin_unlock_irq(&cpa_lock);
        flush_map();
        list_for_each_entry_safe(pg, next, &l, lru)
                __free_page(pg);
-} 
+}
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
 void kernel_map_pages(struct page *page, int numpages, int enable)
 {
        if (PageHighMem(page))
                return;
+       if (!enable)
+               mutex_debug_check_no_locks_freed(page_address(page),
+                                                numpages * PAGE_SIZE);
+
        /* the return value is ignored - the calls cannot fail,
         * large pages are disabled at boot time.
         */