x86, mm: fault.c, factor out the vm86 fault check

Impact: cleanup

Instead of an ugly, open-coded, #ifdef-ed vm86 related legacy check
in do_page_fault(), put it into the check_v8086_mode() helper
function and merge it with an existing #ifdef.

Also, simplify the code flow a tiny bit in the helper.

No code changed:

arch/x86/mm/fault.o:

   text	   data	    bss	    dec	    hex	filename
   2711	     12	     12	   2735	    aaf	fault.o.before
   2711	     12	     12	   2735	    aaf	fault.o.after

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 31 insertions, 12 deletions

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 72973c7682ba..7dc0615c3cfe 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -328,14 +328,41 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
 
         return pmd_k;
 }
-#endif
 
-#ifdef CONFIG_X86_64
+/*
+ * Did it hit the DOS screen memory VA from vm86 mode?
+ */
+static inline void
+check_v8086_mode(struct pt_regs *regs, unsigned long address,
+                 struct task_struct *tsk)
+{
+        unsigned long bit;
+
+        if (!v8086_mode(regs))
+                return;
+
+        bit = (address - 0xA0000) >> PAGE_SHIFT;
+        if (bit < 32)
+                tsk->thread.screen_bitmap |= 1 << bit;
+}
+
+#else /* CONFIG_X86_64: */
+
 static const char errata93_warning[] =
 KERN_ERR "******* Your BIOS seems to not contain a fix for K8 errata #93\n"
 KERN_ERR "******* Working around it, but it may cause SEGVs or burn power.\n"
 KERN_ERR "******* Please consider a BIOS update.\n"
 KERN_ERR "******* Disabling USB legacy in the BIOS may also help.\n";
+
+/*
+ * No vm86 mode in 64-bit mode:
+ */
+static inline void
+check_v8086_mode(struct pt_regs *regs, unsigned long address,
+                 struct task_struct *tsk)
+{
+}
+
 #endif
 
 /*
@@ -1091,16 +1118,8 @@ good_area:
         else
                 tsk->min_flt++;
 
-#ifdef CONFIG_X86_32
-        /*
-         * Did it hit the DOS screen memory VA from vm86 mode?
-         */
-        if (v8086_mode(regs)) {
-                unsigned long bit = (address - 0xA0000) >> PAGE_SHIFT;
-                if (bit < 32)
-                        tsk->thread.screen_bitmap |= 1 << bit;
-        }
-#endif
+        check_v8086_mode(regs, address, tsk);
+
         up_read(&mm->mmap_sem);
 }