x86: reduce ifdef sections in fault.c

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index e4440d0..3fff490 100644 (file)
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -508,6 +508,10 @@ static int vmalloc_fault(unsigned long address)
        pmd_t *pmd, *pmd_ref;
        pte_t *pte, *pte_ref;
 
+       /* Make sure we are in vmalloc area */
+       if (!(address >= VMALLOC_START && address < VMALLOC_END))
+               return -1;
+
        /* Copy kernel mappings over when needed. This can also
           happen within a race in page table update. In the later
           case just flush. */
@@ -603,6 +607,9 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
         */
 #ifdef CONFIG_X86_32
        if (unlikely(address >= TASK_SIZE)) {
+#else
+       if (unlikely(address >= TASK_SIZE64)) {
+#endif
                if (!(error_code & (PF_RSVD|PF_USER|PF_PROT)) &&
                    vmalloc_fault(address) >= 0)
                        return;
@@ -618,6 +625,8 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
                goto bad_area_nosemaphore;
        }
 
+
+#ifdef CONFIG_X86_32
        /* It's safe to allow irq's after cr2 has been saved and the vmalloc
           fault has been handled. */
        if (regs->flags & (X86_EFLAGS_IF|VM_MASK))
@@ -630,28 +639,6 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
        if (in_atomic() || !mm)
                goto bad_area_nosemaphore;
 #else /* CONFIG_X86_64 */
-       if (unlikely(address >= TASK_SIZE64)) {
-               /*
-                * Don't check for the module range here: its PML4
-                * is always initialized because it's shared with the main
-                * kernel text. Only vmalloc may need PML4 syncups.
-                */
-               if (!(error_code & (PF_RSVD|PF_USER|PF_PROT)) &&
-                     ((address >= VMALLOC_START && address < VMALLOC_END))) {
-                       if (vmalloc_fault(address) >= 0)
-                               return;
-               }
-
-               /* Can handle a stale RO->RW TLB */
-               if (spurious_fault(address, error_code))
-                       return;
-
-               /*
-                * Don't take the mm semaphore here. If we fixup a prefetch
-                * fault we could otherwise deadlock.
-                */
-               goto bad_area_nosemaphore;
-       }
        if (likely(regs->flags & X86_EFLAGS_IF))
                local_irq_enable();