x86: add set_memory_4k to pageattr.c

[linux-2.6-omap-h63xx.git] / arch / x86 / mm / pageattr.c

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 270cab2e6030050e8bd76ebf628bab8236fedfb2..7d9517abc9af500fc91c7a3f79b397c8e60dd328 100644 (file)
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -31,6 +31,7 @@ struct cpa_data {
        int             numpages;
        int             flushtlb;
        unsigned long   pfn;
+       unsigned        force_split : 1;
 };
 
 #ifdef CONFIG_X86_64
@@ -262,6 +263,9 @@ try_preserve_large_page(pte_t *kpte, unsigned long address,
        int i, do_split = 1;
        unsigned int level;
 
+       if (cpa->force_split)
+               return 1;
+
        spin_lock_irqsave(&pgd_lock, flags);
        /*
         * Check for races, another CPU might have split this page
@@ -696,7 +700,8 @@ static inline int cache_attr(pgprot_t attr)
 }
 
 static int change_page_attr_set_clr(unsigned long addr, int numpages,
-                                   pgprot_t mask_set, pgprot_t mask_clr)
+                                   pgprot_t mask_set, pgprot_t mask_clr,
+                                   int force_split)
 {
        struct cpa_data cpa;
        int ret, cache, checkalias;
@@ -707,7 +712,7 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages,
         */
        mask_set = canon_pgprot(mask_set);
        mask_clr = canon_pgprot(mask_clr);
-       if (!pgprot_val(mask_set) && !pgprot_val(mask_clr))
+       if (!pgprot_val(mask_set) && !pgprot_val(mask_clr) && !force_split)
                return 0;
 
        /* Ensure we are PAGE_SIZE aligned */
@@ -724,6 +729,7 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages,
        cpa.mask_set = mask_set;
        cpa.mask_clr = mask_clr;
        cpa.flushtlb = 0;
+       cpa.force_split = force_split;
 
        /* No alias checking for _NX bit modifications */
        checkalias = (pgprot_val(mask_set) | pgprot_val(mask_clr)) != _PAGE_NX;
@@ -762,13 +768,13 @@ out:
 static inline int change_page_attr_set(unsigned long addr, int numpages,
                                       pgprot_t mask)
 {
-       return change_page_attr_set_clr(addr, numpages, mask, __pgprot(0));
+       return change_page_attr_set_clr(addr, numpages, mask, __pgprot(0), 0);
 }
 
 static inline int change_page_attr_clear(unsigned long addr, int numpages,
                                         pgprot_t mask)
 {
-       return change_page_attr_set_clr(addr, numpages, __pgprot(0), mask);
+       return change_page_attr_set_clr(addr, numpages, __pgprot(0), mask, 0);
 }
 
 int _set_memory_uc(unsigned long addr, int numpages)
@@ -847,6 +853,12 @@ int set_memory_np(unsigned long addr, int numpages)
        return change_page_attr_clear(addr, numpages, __pgprot(_PAGE_PRESENT));
 }
 
+int set_memory_4k(unsigned long addr, int numpages)
+{
+       return change_page_attr_set_clr(addr, numpages, __pgprot(0),
+                                       __pgprot(0), 1);
+}
+
 int set_pages_uc(struct page *page, int numpages)
 {
        unsigned long addr = (unsigned long)page_address(page);