Date: Wed, 10 Nov 2004 13:47:53 -0800
From: Andrew Morton <akpm@osdl.org>
To: Lukas Hejtmanek <xhejtman@mail.muni.cz>
Cc: marcelo.tosatti@cyclades.com, zaphodb@zaphods.net,
       linux-kernel@vger.kernel.org, piggin@cyberone.com.au
Subject: Re: Kernel 2.6.9 Multiple Page Allocation Failures
Message-Id: <20041110134753.4fc07d70.akpm@osdl.org>
In-Reply-To: <20041110212447.GB25410@mail.muni.cz>
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Lukas Hejtmanek <xhejtman@mail.muni.cz> wrote:
>
> > I don't think there's really a bug here.  It's a tiny bit racy, but that
> > will merely cause a small inaccuracy in the stats.
> > 
> > I think I'll just drop the debug patch.  You can disable
> > CONFIG_DEBUG_PREEMPT to shut things up.
> 
> It did not help :( I had to disable CONFIG_PREEMPT to shut it up.
> 
> I had:
> CONFIG_PREEMPT=y
> CONFIG_PREEMPT_BKL=y
> CONFIG_DEBUG_PREEMPT=y
> 
> It did what I wrote.
> Then I had:
> CONFIG_PREEMPT=y
> #CONFIG_PREEMPT_BKL=y
> #CONFIG_DEBUG_PREEMPT=y
> 
> and I had the same (or similar messages)

Confused.  Disabling CONFIG_DEBUG_PREEMPT should make those messages go
away.  lib/kernel_lock.c has:


#if defined(CONFIG_PREEMPT) && defined(__smp_processor_id) && \
		defined(CONFIG_DEBUG_PREEMPT)

/*
 * Debugging check.
 */
unsigned int smp_processor_id(void)
{
	...

	printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x] code: %s/%d\n", preempt_count(), current->comm, current->pid);
	print_symbol("caller is %s\n", (long)__builtin_return_address(0));
	dump_stack();

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