linux-kernel - [patch] Re: how to link to hrtimers in the kernel

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Date:	Mon, 6 Oct 2008 09:33:08 -0700 (PDT)
From:	"Randy.Dunlap" <rdunlap@...otime.net>
To:	George Nychis <gnychis@....edu>
cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: [patch] Re: how to link to hrtimers in the kernel

On Mon, 6 Oct 2008, George Nychis wrote:

> Hi all,
> 
> I have modified drivers/usb/core/devio.c to use hrtimer_nanosleep(), and have
> included linux/hrtimer.h with it.
> 
> But now I am having trouble linking, I get:
> ERROR: "hrtimer_nanosleep" [drivers/usb/core/usbcore.ko] undefined!
> 
> How do I properly link to the hrtimer library?

Hi,
That function needs to be exported in its source file.
Patch below should fix it for you.



From: Randy Dunlap <randy.dunlap@...cle.com>

Export hrtimer_nanosleep() for module use.

Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
---
 kernel/hrtimer.c |    1 +
 1 file changed, 1 insertion(+)

--- linux-2.6.27-rc8-git5.orig/kernel/hrtimer.c
+++ linux-2.6.27-rc8-git5/kernel/hrtimer.c
@@ -1559,6 +1559,7 @@ out:
 	destroy_hrtimer_on_stack(&t.timer);
 	return ret;
 }
+EXPORT_SYMBOL_GPL(hrtimer_nanosleep);
 
 asmlinkage long
 sys_nanosleep(struct timespec __user *rqtp, struct timespec __user *rmtp)
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