1 files changed, 54 insertions, 42 deletions

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index a2d747c06147..23f0aa3d01c1 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -228,7 +228,6 @@ repeat:
 /**
  * change_page_attr_addr - Change page table attributes in linear mapping
  * @address: Virtual address in linear mapping.
- * @numpages: Number of pages to change
  * @prot:    New page table attribute (PAGE_*)
  *
  * Change page attributes of a page in the direct mapping. This is a variant
@@ -240,10 +239,10 @@ repeat:
  * Modules and drivers should use the set_memory_* APIs instead.
  */
 
-static int change_page_attr_addr(unsigned long address, int numpages,
-                                                                pgprot_t prot)
+static int change_page_attr_addr(unsigned long address, pgprot_t prot)
 {
-        int err = 0, kernel_map = 0, i;
+        int err = 0, kernel_map = 0;
+        unsigned long pfn = __pa(address) >> PAGE_SHIFT;
 
 #ifdef CONFIG_X86_64
         if (address >= __START_KERNEL_map &&
@@ -254,30 +253,27 @@ static int change_page_attr_addr(unsigned long address, int numpages,
         }
 #endif
 
-        for (i = 0; i < numpages; i++, address += PAGE_SIZE) {
-                unsigned long pfn = __pa(address) >> PAGE_SHIFT;
+        if (!kernel_map || pte_present(pfn_pte(0, prot))) {
+                err = __change_page_attr(address, pfn, prot);
+                if (err)
+                        return err;
+        }
 
-                if (!kernel_map || pte_present(pfn_pte(0, prot))) {
-                        err = __change_page_attr(address, pfn, prot);
-                        if (err)
-                                break;
-                }
 #ifdef CONFIG_X86_64
-                /*
-                 * Handle kernel mapping too which aliases part of
-                 * lowmem:
-                 */
-                if (__pa(address) < KERNEL_TEXT_SIZE) {
-                        unsigned long addr2;
-                        pgprot_t prot2;
-
-                        addr2 = __START_KERNEL_map + __pa(address);
-                        /* Make sure the kernel mappings stay executable */
-                        prot2 = pte_pgprot(pte_mkexec(pfn_pte(0, prot)));
-                        err = __change_page_attr(addr2, pfn, prot2);
-                }
-#endif
+        /*
+         * Handle kernel mapping too which aliases part of
+         * lowmem:
+         */
+        if (__pa(address) < KERNEL_TEXT_SIZE) {
+                unsigned long addr2;
+                pgprot_t prot2;
+
+                addr2 = __START_KERNEL_map + __pa(address);
+                /* Make sure the kernel mappings stay executable */
+                prot2 = pte_pgprot(pte_mkexec(pfn_pte(0, prot)));
+                err = __change_page_attr(addr2, pfn, prot2);
         }
+#endif
 
         return err;
 }
@@ -307,16 +303,24 @@ static int change_page_attr_set(unsigned long addr, int numpages,
         pgprot_t current_prot;
         int level;
         pte_t *pte;
+        int i, ret;
 
-        pte = lookup_address(addr, &level);
-        if (pte)
-                current_prot = pte_pgprot(*pte);
-        else
-                pgprot_val(current_prot) = 0;
+        for (i = 0; i < numpages ; i++) {
 
-        pgprot_val(prot) = pgprot_val(current_prot) | pgprot_val(prot);
+                pte = lookup_address(addr, &level);
+                if (pte)
+                        current_prot = pte_pgprot(*pte);
+                else
+                        pgprot_val(current_prot) = 0;
 
-        return change_page_attr_addr(addr, numpages, prot);
+                pgprot_val(prot) = pgprot_val(current_prot) | pgprot_val(prot);
+
+                ret = change_page_attr_addr(addr, prot);
+                if (ret)
+                        return ret;
+                addr += PAGE_SIZE;
+        }
+        return 0;
 }
 
 /**
@@ -344,16 +348,24 @@ static int change_page_attr_clear(unsigned long addr, int numpages,
         pgprot_t current_prot;
         int level;
         pte_t *pte;
-
-        pte = lookup_address(addr, &level);
-        if (pte)
-                current_prot = pte_pgprot(*pte);
-        else
-                pgprot_val(current_prot) = 0;
-
-        pgprot_val(prot) = pgprot_val(current_prot) & ~pgprot_val(prot);
-
-        return change_page_attr_addr(addr, numpages, prot);
+        int i, ret;
+
+        for (i = 0; i < numpages; i++) {
+                pte = lookup_address(addr, &level);
+                if (pte)
+                        current_prot = pte_pgprot(*pte);
+                else
+                        pgprot_val(current_prot) = 0;
+
+                pgprot_val(prot) =
+                                pgprot_val(current_prot) & ~pgprot_val(prot);
+
+                ret = change_page_attr_addr(addr, prot);
+                if (ret)
+                        return ret;
+                addr += PAGE_SIZE;
+        }
+        return 0;
 }
 
 int set_memory_uc(unsigned long addr, int numpages)