Merge git://git.linux-xtensa.org/kernel/xtensa-feed

[linux-2.6-omap-h63xx.git] / arch / i386 / mm / pageattr.c

diff --git a/arch/i386/mm/pageattr.c b/arch/i386/mm/pageattr.c
index 47bd477c8eccb4e2691f9a21fc3e09e3e7beb839..4241a74d16c8d3181256b9ed7b0c688edb2bfe85 100644 (file)
--- a/arch/i386/mm/pageattr.c
+++ b/arch/i386/mm/pageattr.c
@@ -60,7 +60,7 @@ static struct page *split_large_page(unsigned long address, pgprot_t prot,
        address = __pa(address);
        addr = address & LARGE_PAGE_MASK; 
        pbase = (pte_t *)page_address(base);
-       paravirt_alloc_pt(page_to_pfn(base));
+       paravirt_alloc_pt(&init_mm, page_to_pfn(base));
        for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE) {
                set_pte(&pbase[i], pfn_pte(addr >> PAGE_SHIFT,
                                           addr == address ? prot : ref_prot));
@@ -68,14 +68,23 @@ static struct page *split_large_page(unsigned long address, pgprot_t prot,
        return base;
 } 
 
-static void flush_kernel_map(void *arg)
+static void cache_flush_page(struct page *p)
 { 
-       unsigned long adr = (unsigned long)arg;
+       unsigned long adr = (unsigned long)page_address(p);
+       int i;
+       for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
+               asm volatile("clflush (%0)" :: "r" (adr + i));
+}
+
+static void flush_kernel_map(void *arg)
+{
+       struct list_head *lh = (struct list_head *)arg;
+       struct page *p;
 
-       if (adr && cpu_has_clflush) {
-               int i;
-               for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
-                       asm volatile("clflush (%0)" :: "r" (adr + i));
+       /* High level code is not ready for clflush yet */
+       if (0 && cpu_has_clflush) {
+               list_for_each_entry (p, lh, lru)
+                       cache_flush_page(p);
        } else if (boot_cpu_data.x86_model >= 4)
                wbinvd();
 
@@ -127,6 +136,12 @@ static inline void revert_page(struct page *kpte_page, unsigned long address)
                            ref_prot));
 }
 
+static inline void save_page(struct page *kpte_page)
+{
+       if (!test_and_set_bit(PG_arch_1, &kpte_page->flags))
+               list_add(&kpte_page->lru, &df_list);
+}
+
 static int
 __change_page_attr(struct page *page, pgprot_t prot)
 { 
@@ -141,6 +156,9 @@ __change_page_attr(struct page *page, pgprot_t prot)
        if (!kpte)
                return -EINVAL;
        kpte_page = virt_to_page(kpte);
+       BUG_ON(PageLRU(kpte_page));
+       BUG_ON(PageCompound(kpte_page));
+
        if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL)) { 
                if (!pte_huge(*kpte)) {
                        set_pte_atomic(kpte, mk_pte(page, prot)); 
@@ -170,20 +188,20 @@ __change_page_attr(struct page *page, pgprot_t prot)
         * time (not via split_large_page) and in turn we must not
         * replace it with a largepage.
         */
+
+       save_page(kpte_page);
        if (!PageReserved(kpte_page)) {
                if (cpu_has_pse && (page_private(kpte_page) == 0)) {
-                       ClearPagePrivate(kpte_page);
                        paravirt_release_pt(page_to_pfn(kpte_page));
-                       list_add(&kpte_page->lru, &df_list);
                        revert_page(kpte_page, address);
                }
        }
        return 0;
 } 
 
-static inline void flush_map(void *adr)
+static inline void flush_map(struct list_head *l)
 {
-       on_each_cpu(flush_kernel_map, adr, 1, 1);
+       on_each_cpu(flush_kernel_map, l, 1, 1);
 }
 
 /*
@@ -225,11 +243,13 @@ void global_flush_tlb(void)
        spin_lock_irq(&cpa_lock);
        list_replace_init(&df_list, &l);
        spin_unlock_irq(&cpa_lock);
-       if (!cpu_has_clflush)
-               flush_map(NULL);
+       flush_map(&l);
        list_for_each_entry_safe(pg, next, &l, lru) {
-               if (cpu_has_clflush)
-                       flush_map(page_address(pg));
+               list_del(&pg->lru);
+               clear_bit(PG_arch_1, &pg->flags);
+               if (PageReserved(pg) || !cpu_has_pse || page_private(pg) != 0)
+                       continue;
+               ClearPagePrivate(pg);
                __free_page(pg);
        }
 }