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Re: MIPS: return after handling coprocessor 2 exception

To: Jesper Nilsson <>
Subject: Re: MIPS: return after handling coprocessor 2 exception
From: David Daney <>
Date: Thu, 17 Jun 2010 10:13:18 -0700
Cc: Ralf Baechle <>,,
In-reply-to: <>
References: <>
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100430 Fedora/3.0.4-2.fc12 Thunderbird/3.0.4
On 06/17/2010 06:25 AM, Jesper Nilsson wrote:
Breaking here dropped us to the default code which always sends
a SIGILL to the current process, no matter what the CU2 notifier says.

Signed-off-by: Jesper Nilsson<>
  traps.c |    2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 8bdd6a6..8527808 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -976,7 +976,7 @@ asmlinkage void do_cpu(struct pt_regs *regs)

        case 2:
                raw_notifier_call_chain(&cu2_chain, CU2_EXCEPTION, regs);
-               break;
+               return;

What happens when the call chain is empty, and the proper action *is* SIGILL?

David Daney

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