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Date: Tue, 09 Oct 2012 16:10:16 +0200
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai] Exporting __ipipe_get_cs_tsc
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To: xenomai@xenomai.org

On 10/09/2012 02:32 PM, Henri Roosen wrote:
> Hi,
> 
> I'm using the current git heads of core-3.4 and xenomai 2.6.1 for x86
> with the attached config file.
> 
> When compiling the modules I get undefined symbols:
> ERROR: "__ipipe_get_cs_tsc" [kernel/xenomai/skins/posix/xeno_posix.ko]
> undefined!
> 
> This is because the run time seleted __ipipe_get_cs_tsc assembly
> function is not exported for module use.
> I don't know how to export this or whether the symbol should be used
> by modules in the first place.
> 

Please try this:

diff --git a/arch/x86/kernel/ipipe.c b/arch/x86/kernel/ipipe.c
index 430aeea..2d2f83c 100644
--- a/arch/x86/kernel/ipipe.c
+++ b/arch/x86/kernel/ipipe.c
@@ -634,6 +634,11 @@ void update_vsyscall(struct timespec *wall_time,
struct timespec *wtm,
 void update_vsyscall_tz(void)
 {
 }
+
+#ifdef CONFIG_IPIPE_WANT_CLOCKSOURCE
+EXPORT_SYMBOL_GPL(__ipipe_get_cs_tsc);
+#endif
+
 #endif /* CONFIG_X86_32 */

 struct task_struct *__switch_to(struct task_struct *prev_p,
> Please advice.
> 
> Thanks,
> Henri.
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-- 
Philippe.