linux-kernel - Re: [PREEMPT_RT] [PATCH] Fix BUG: using smp_processor_id() in preemptible [00000000] code: nfsd/2852

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Message-ID: <20070418151707.GB8546@elte.hu>
Date:	Wed, 18 Apr 2007 17:17:07 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Ankita Garg <ankita@...ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PREEMPT_RT] [PATCH] Fix BUG: using smp_processor_id() in preemptible [00000000] code: nfsd/2852


* Ankita Garg <ankita@...ibm.com> wrote:

> While running some tests on 2.6.20-rt8 with DEBUG_PREEMPT on, I hit 
> the following BUG:

> This patch fixes the above issue which arises due to the call to 
> smp_processor_id in drain_array() from mm/slab.c. smp_processor_id() 
> invocation is redundant here, as the call to slab_spin_lock_irq() 
> already fills the value of this_cpu using raw_smp_processor_id().

thanks, applied!

	Ingo
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