Re: powerpc: Print instruction when logging unhandled exceptions

It is often useful to see the instruction that caused an unhandled
exception.

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 0dc43f9..27e30c8 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c

@@ -252,9 +252,18 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
 	}
 
 	if (show_unhandled_signals && unhandled_signal(current, signr)) {
+		u32 __user *nia = (u32 __user *)regs->nip;
+		u32 insn = 0;
+
+		pagefault_disable();
+		if (!access_ok(VERIFY_READ, nia, sizeof(*nia)) ||
+		    __get_user_inatomic(insn, nia))
+			insn = 0xffffffffUL;
+		pagefault_enable();