4 files changed, 27 insertions, 13 deletions

diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c
index 7e8db53528a7..61b41ca3b5a2 100644
--- a/arch/x86/mm/extable.c
+++ b/arch/x86/mm/extable.c
@@ -23,6 +23,12 @@ int fixup_exception(struct pt_regs *regs)
 
         fixup = search_exception_tables(regs->ip);
         if (fixup) {
+                /* If fixup is less than 16, it means uaccess error */
+                if (fixup->fixup < 16) {
+                        current_thread_info()->uaccess_err = -EFAULT;
+                        regs->ip += fixup->fixup;
+                        return 1;
+                }
                 regs->ip = fixup->fixup;
                 return 1;
         }
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 65709a6aa6ee..d3eee74f830a 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -420,7 +420,6 @@ static noinline void pgtable_bad(struct pt_regs *regs,
         printk(KERN_ALERT "%s: Corrupted page table at address %lx\n",
                tsk->comm, address);
         dump_pagetable(address);
-        tsk = current;
         tsk->thread.cr2 = address;
         tsk->thread.trap_no = 14;
         tsk->thread.error_code = error_code;
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index af750ab973b6..1448bcb7f22f 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -367,7 +367,7 @@ EXPORT_SYMBOL(ioremap_nocache);
  *
  * Must be freed with iounmap.
  */
-void __iomem *ioremap_wc(unsigned long phys_addr, unsigned long size)
+void __iomem *ioremap_wc(resource_size_t phys_addr, unsigned long size)
 {
         if (pat_enabled)
                 return __ioremap_caller(phys_addr, size, _PAGE_CACHE_WC,
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 7b61036427df..9127e31c7268 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -30,7 +30,7 @@
 #ifdef CONFIG_X86_PAT
 int __read_mostly pat_enabled = 1;
 
-void __cpuinit pat_disable(char *reason)
+void __cpuinit pat_disable(const char *reason)
 {
         pat_enabled = 0;
         printk(KERN_INFO "%s\n", reason);
@@ -42,6 +42,11 @@ static int __init nopat(char *str)
         return 0;
 }
 early_param("nopat", nopat);
+#else
+static inline void pat_disable(const char *reason)
+{
+        (void)reason;
+}
 #endif
 
 
@@ -78,16 +83,20 @@ void pat_init(void)
         if (!pat_enabled)
                 return;
 
-        /* Paranoia check. */
-        if (!cpu_has_pat && boot_pat_state) {
-                /*
-                 * If this happens we are on a secondary CPU, but
-                 * switched to PAT on the boot CPU. We have no way to
-                 * undo PAT.
-                 */
-                printk(KERN_ERR "PAT enabled, "
-                       "but not supported by secondary CPU\n");
-                BUG();
+        if (!cpu_has_pat) {
+                if (!boot_pat_state) {
+                        pat_disable("PAT not supported by CPU.");
+                        return;
+                } else {
+                        /*
+                         * If this happens we are on a secondary CPU, but
+                         * switched to PAT on the boot CPU. We have no way to
+                         * undo PAT.
+                         */
+                        printk(KERN_ERR "PAT enabled, "
+                               "but not supported by secondary CPU\n");
+                        BUG();
+                }
         }
 
         /* Set PWT to Write-Combining. All other bits stay the same */