linux-kernel - Re: [s390x] build error: undefined reference to `sie

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Date:	Thu, 25 Jul 2013 11:21:23 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Zhouping Liu <zliu@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [s390x] build error: undefined reference to `sie_exit'

On Wed, Jul 24, 2013 at 10:09:13PM -0400, Zhouping Liu wrote:
> Hello All,
> 
> I met the below error on b3a3a9c441 with s390x arch:
> arch/s390/built-in.o: In function `sys_call_table_emu':
> (.rodata+0x2b98): undefined reference to `sie_exit'
> arch/s390/built-in.o: In function `sys_call_table_emu':
> (.rodata+0x2ba0): undefined reference to `sie_exit'
> make: *** [vmlinux] Error 1

Thanks for reporting, I just committed the patch below to our
local branch:

>From c073dc1f474094b5610739e752d83bcb547b1d7d Mon Sep 17 00:00:00 2001
From: Heiko Carstens <heiko.carstens@...ibm.com>
Date: Thu, 25 Jul 2013 11:16:48 +0200
Subject: [PATCH] s390/perf: fix compile error (undefined reference sie_exit)

The perf_event code references sie_exit even if KVM is not available.
So add proper ifdefs to fix this one:

arch/s390/built-in.o: In function `sys_call_table_emu':
(.rodata+0x2b98): undefined reference to `sie_exit'
arch/s390/built-in.o: In function `sys_call_table_emu':
(.rodata+0x2ba0): undefined reference to `sie_exit'
make: *** [vmlinux] Error 1

Reported-by: Zhouping Liu <zliu@...hat.com>
Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
---
 arch/s390/kernel/perf_event.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/s390/kernel/perf_event.c b/arch/s390/kernel/perf_event.c
index a6fc037..500aa10 100644
--- a/arch/s390/kernel/perf_event.c
+++ b/arch/s390/kernel/perf_event.c
@@ -52,12 +52,13 @@ static struct kvm_s390_sie_block *sie_block(struct pt_regs *regs)
 
 static bool is_in_guest(struct pt_regs *regs)
 {
-	unsigned long ip = instruction_pointer(regs);
-
 	if (user_mode(regs))
 		return false;
-
-	return ip == (unsigned long) &sie_exit;
+#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
+	return instruction_pointer(regs) == (unsigned long) &sie_exit;
+#else
+	return false;
+#endif
 }
 
 static unsigned long guest_is_user_mode(struct pt_regs *regs)
-- 
1.8.2.3

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