[S390] Use do_exception() in pagetable walk usercopy functions.

[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / s390 / mm / fault.c

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 5a9e9a7..fc102e7 100644 (file)
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -442,6 +442,29 @@ no_context:
 }
 #endif
 
+int __handle_fault(unsigned long uaddr, unsigned long int_code, int write_user)
+{
+       struct pt_regs regs;
+       int access, fault;
+
+       regs.psw.mask = psw_kernel_bits;
+       if (!irqs_disabled())
+               regs.psw.mask |= PSW_MASK_IO | PSW_MASK_EXT;
+       regs.psw.addr = (unsigned long) __builtin_return_address(0);
+       regs.psw.addr |= PSW_ADDR_AMODE;
+       uaddr &= PAGE_MASK;
+       access = write_user ? VM_WRITE : VM_READ;
+       fault = do_exception(&regs, access, uaddr | 2);
+       if (unlikely(fault)) {
+               if (fault & VM_FAULT_OOM) {
+                       pagefault_out_of_memory();
+                       fault = 0;
+               } else if (fault & VM_FAULT_SIGBUS)
+                       do_sigbus(&regs, int_code, uaddr);
+       }
+       return fault ? -EFAULT : 0;
+}
+
 #ifdef CONFIG_PFAULT 
 /*
  * 'pfault' pseudo page faults routines.