linux-kernel - Re: [PATCH 2/2] Compile error with allmodconfig and CONFIG_PREEMPT_RT

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Message-ID: <20111114165148.GB2372@linux.vnet.ibm.com>
Date:	Mon, 14 Nov 2011 08:51:48 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	John Kacur <jkacur@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>,
	rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [PATCH 2/2] Compile error with allmodconfig and
 CONFIG_PREEMPT_RT_FULL=y

On Mon, Nov 14, 2011 at 02:44:43AM +0100, John Kacur wrote:
> ERROR: "in_serving_softirq" [net/sched/cls_cgroup.ko] undefined!
> 
> The above can be fixed by exporting in_serving_softirq
> 
> Signed-off-by: John Kacur <jkacur@...hat.com>
> 
> The above patch was originally for 3.0.9-rt25
> But I also needed to cherry-pick it for 3.2-rc1-rt1
> ---
>  kernel/softirq.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/softirq.c b/kernel/softirq.c
> index 3db1d6f..5452432 100644
> --- a/kernel/softirq.c
> +++ b/kernel/softirq.c
> @@ -447,6 +447,7 @@ int in_serving_softirq(void)
>  	preempt_enable();
>  	return res;
>  }
> +EXPORT_SYMBOL(in_serving_softirq);

Why not EXPORT_SYMBOL_GPL?

With that change,

Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

Not yet ready for mainline, because mainline does not yet have
in_serving_softirq().  Therefore not queued for -rcu.

							Thanx, Paul

>  /*
>   * Called with bh and local interrupts disabled. For full RT cpu must
> -- 
> 1.7.2.3
> 

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