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

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Message-ID: <CA+8MBbKq1idWt1OSpRM3mWMDAQaEoewrU=h=m_pFoidVy6OA-Q@mail.gmail.com>
Date:	Wed, 20 Nov 2013 11:59:42 -0800
From:	Tony Luck <tony.luck@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
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 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

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.

Do we need a stub for the =n case:

asmlinkage void __sched preempt_schedule_irq(void)
{
           schedule();
}

Or is life more complicated than that?

-Tony
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