linux-kernel - Re: [RFC][PATCH] slub: Check for page NULL before doing the node

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Message-ID: <0000013c4a8363ed-ba83975a-7b62-4a9e-981b-8b44d8030431-000000@email.amazonses.com>
Date:	Thu, 17 Jan 2013 21:56:30 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	RT <linux-rt-users@...r.kernel.org>,
	Clark Williams <clark@...hat.com>,
	John Kacur <jkacur@...il.com>,
	"Luis Claudio R. Goncalves" <lgoncalv@...hat.com>
Subject: Re: [RFC][PATCH] slub: Check for page NULL before doing the node_match
 check

on Thu, 17 Jan 2013, Christoph Lameter wrote:

> Ditto which leaves us with:
>
> Index: linux/mm/slub.c
> ===================================================================
> --- linux.orig/mm/slub.c	2013-01-17 15:49:57.417491975 -0600
> +++ linux/mm/slub.c	2013-01-17 15:50:49.010287150 -0600
> @@ -1993,8 +1993,9 @@ static inline void flush_slab(struct kme
>  	deactivate_slab(s, c->page, c->freelist);
>
>  	c->tid = next_tid(c->tid);
> -	c->page = NULL;
>  	c->freelist = NULL;
> +	barrier();
> +	c->page = NULL;
>  }

But the larger question is why is flush_slab() called with interrupts
enabled?

RT?

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