parisc: don't enable irqs unconditionally in handle_interruption()

If the previous context had interrupts disabled, we should better
keep them disabled. This was noticed in the unwinding code where
a copy_from_kernel_nofault() triggered a page fault, and after
the fixup by the page fault handler interrupts where suddenly
enabled.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>

Author: Sven Schnelle

arch/parisc/kernel/traps.c

@@ -481,7 +481,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
 
 	if (code == 1)
 	    pdc_console_restart();  /* switch back to pdc if HPMC */
-	else
+	else if (!irqs_disabled_flags(regs->gr[0]))
 	    local_irq_enable();
 
 	/* Security check: