linux-kernel - Re: mm: slub: gpf in deactivate

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Message-ID: <alpine.DEB.2.10.1403251205140.24534@nuc>
Date:	Tue, 25 Mar 2014 12:06:36 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Michal Hocko <mhocko@...e.cz>
cc:	Sasha Levin <sasha.levin@...cle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: mm: slub: gpf in deactivate_slab

On Tue, 25 Mar 2014, Michal Hocko wrote:

> You are right. The function even does VM_BUG_ON(!irqs_disabled())...
> Unfortunatelly we do not seem to have an _irq alternative of the bit
> spinlock.
> Not sure what to do about it. Christoph?
>
> Btw. it seems to go way back to 3.1 (1d07171c5e58e).

Well there is a preempt_enable() (bit_spin_lock) and a preempt_disable()
bit_spin_unlock() within a piece of code where irqs are disabled.

Is that a problem? Has been there for a long time.

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