releases/3.16.57/mips-normalise-code-flow-in-the-cpu-exception-handler.patch

From: "Maciej W. Rozycki" <macro@linux-mips.org>
Date: Fri, 3 Apr 2015 23:25:08 +0100
Subject: MIPS: Normalise code flow in the CpU exception handler

commit 27e28e8ec47a5ce335ebf25d34ca356c80635908 upstream.

Changes applied to `do_cpu' over time reduced the use of the SIGILL
issued with `force_sig' at the end to a single CU3 case only in the
switch statement there.  Move that `force_sig' call over to right where
required then and toss out the pile of gotos now not needed to skip over
the call, replacing them with regular breaks out of the switch.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9683/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 arch/mips/kernel/traps.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1247,7 +1247,7 @@ asmlinkage void do_cpu(struct pt_regs *r
 		status = -1;
 
 		if (unlikely(compute_return_epc(regs) < 0))
-			goto out;
+			break;
 
 		if (get_isa16_mode(regs->cp0_epc)) {
 			unsigned short mmop[2] = { 0 };
@@ -1280,7 +1280,7 @@ asmlinkage void do_cpu(struct pt_regs *r
 			force_sig(status, current);
 		}
 
-		goto out;
+		break;
 
 	case 3:
 		/*
@@ -1296,8 +1296,10 @@ asmlinkage void do_cpu(struct pt_regs *r
 		 * erroneously too, so they are covered by this choice
 		 * as well.
 		 */
-		if (raw_cpu_has_fpu)
+		if (raw_cpu_has_fpu) {
+			force_sig(SIGILL, current);
 			break;
+		}
 		/* Fall through.  */
 
 	case 1:
@@ -1320,16 +1322,13 @@ asmlinkage void do_cpu(struct pt_regs *r
 		if (!process_fpemu_return(sig, fault_addr, fcr31) && !err)
 			mt_ase_fp_affinity();
 
-		goto out;
+		break;
 
 	case 2:
 		raw_notifier_call_chain(&cu2_chain, CU2_EXCEPTION, regs);
-		goto out;
+		break;
 	}
 
-	force_sig(SIGILL, current);
-
-out:
 	exception_exit(prev_state);
 }