linux-kernel - Re: [patch 4/6] ia64: Use preempt_schedule

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Date:	Wed, 20 Nov 2013 21:57:48 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Tony Luck <tony.luck@...il.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>, Peter Anvin <hpa@...or.com>,
	Mike Galbraith <bitbucket@...ine.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [patch 4/6] ia64: Use preempt_schedule_irq



On Wed, 20 Nov 2013, Tony Luck wrote:

> On Tue, Sep 17, 2013 at 11:53 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> > Use the proper core function instead of fiddling with PREEMPT_ACTIVE
> > and enable/disable interrupts in the low level code.
> >
> > Index: linux-2.6/arch/ia64/kernel/entry.S
> > ===================================================================
> > --- linux-2.6.orig/arch/ia64/kernel/entry.S
> > +++ linux-2.6/arch/ia64/kernel/entry.S
> ...
> > -       br.call.spnt.many rp=schedule
> > +       br.call.spnt.many rp=preempt_schedule_irq
> 
> This just hit mainline ... and I'm getting
> 
> arch/ia64/kernel/built-in.o: In function `skip_rbs_switch':
> (.text+0xef2): undefined reference to `preempt_schedule_irq'
> make: *** [vmlinux] Error 1

Hrmpf.
 
> Probably because I have CONFIG_PREEMPT=n, and there seems only
> to be a definition for this function in kernel/sched/core.c when it is =y.

Bah. I probably compiled that with preempt=y ...
 
> Do we need a stub for the =n case:
> 
> asmlinkage void __sched preempt_schedule_irq(void)
> {
>            schedule();
> }
> 
> Or is life more complicated than that?

Hmm, I think I fubared that and you decided to ignore my patch :) 

Let me look at it tomorrow morning with full awake brain cells.

Thanks,

	tglx
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