powerpc/mm: The 8xx doesn't call do_page_fault() for breakpoints

The 8xx has a dedicated exception for breakpoints, that directly
calls do_break()
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/mm/fault.c

@@ -254,7 +254,7 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
 	}
 
 #if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE) || \
-			     defined(CONFIG_PPC_BOOK3S_64))
+      defined(CONFIG_PPC_BOOK3S_64) || defined(CONFIG_PPC_8xx))
   	if (error_code & DSISR_DABRMATCH) {
 		/* breakpoint match */
 		do_break(regs, address, error_code);