powerpc/mm: Move exception_enter/exit to a do_page_fault wrapper

This will allow simplifying the returns from do_page_fault

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 4c42263..faddc87 100644 (file)
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -195,10 +195,9 @@ static int mm_fault_error(struct pt_regs *regs, unsigned long addr, int fault)
  * The return value is 0 if the fault was handled, or the signal
  * number if this is a kernel fault that can't be handled here.
  */
-int do_page_fault(struct pt_regs *regs, unsigned long address,
-                           unsigned long error_code)
+static int __do_page_fault(struct pt_regs *regs, unsigned long address,
+                          unsigned long error_code)
 {
-       enum ctx_state prev_state = exception_enter();
        struct vm_area_struct * vma;
        struct mm_struct *mm = current->mm;
        unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
@@ -523,6 +522,15 @@ bad_area_nosemaphore:
        rc = SIGSEGV;
 
 bail:
+       return rc;
+}
+NOKPROBE_SYMBOL(__do_page_fault);
+
+int do_page_fault(struct pt_regs *regs, unsigned long address,
+                 unsigned long error_code)
+{
+       enum ctx_state prev_state = exception_enter();
+       int rc = __do_page_fault(regs, address, error_code);
        exception_exit(prev_state);
        return rc;
 }