powerpc/64s/exception: Fix DAR load for handle_page_fault error case

This buglet goes back to before the 64/32 arch merge, but it does not
seem to have had practical consequences because bad_page_fault does
not use the 2nd argument, but rather regs->dar/nip.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190802105709.27696-18-npiggin@gmail.com

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index c2474c9..d44f6d1 100644 (file)
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -2335,7 +2335,7 @@ handle_page_fault:
        bl      save_nvgprs
        mr      r5,r3
        addi    r3,r1,STACK_FRAME_OVERHEAD
-       lwz     r4,_DAR(r1)
+       ld      r4,_DAR(r1)
        bl      bad_page_fault
        b       ret_from_except