linux-kernel - Re: [PATCH] printk: robustify printk

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Date:	Fri, 08 Aug 2008 16:02:54 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	a.p.zijlstra@...llo.nl
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	mingo@...e.hu, tglx@...utronix.de, marcin.slusarz@...il.com,
	linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH] printk: robustify printk

From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Date: Fri, 08 Aug 2008 20:14:28 +0200

> +struct klogd_wakeup_state {
> +	struct rcu_head head;
> +	int pending;
> +};
> +
> +DEFINE_PER_CPU(struct klogd_wakeup_state, kws);

Since there is not RCU_HEAD_INIT() made on these per-cpu objects, this code
is depending upon the fact that currently the RCU head is just initialized
to all zeros.
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