Date: Mon, 12 Jan 2009 17:14:52 -0600
From: Nathan Lynch <ntl@pobox.com>
To: Oren Laadan <orenl@cs.columbia.edu>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       Linus Torvalds <torvalds@osdl.org>,
       containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org, linux-api@vger.kernel.org,
       Thomas Gleixner <tglx@linutronix.de>, Serge Hallyn <serue@us.ibm.com>,
       Dave Hansen <dave@linux.vnet.ibm.com>, Ingo Molnar <mingo@elte.hu>,
       "H. Peter Anvin" <hpa@zytor.com>,
       Alexander Viro <viro@zeniv.linux.org.uk>,
       Mike Waychison <mikew@google.com>
Subject: Re: [RFC v12][PATCH 13/14] Checkpoint multiple processes
Message-ID: <20090112231452.GC6850@localdomain>
References: <1230542187-10434-1-git-send-email-orenl@cs.columbia.edu>
 <1230542187-10434-14-git-send-email-orenl@cs.columbia.edu>
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> +/* count number of tasks in tree (and optionally fill pid's in array) */
> +static int cr_tree_count_tasks(struct cr_ctx *ctx)
> +{
> +	struct task_struct *root = ctx->root_task;
> +	struct task_struct *task = root;
> +	struct task_struct *parent = NULL;
> +	struct task_struct **tasks_arr = ctx->tasks_arr;
> +	int tasks_nr = ctx->tasks_nr;
> +	int nr = 0;
> +
> +	read_lock(&tasklist_lock);
> +
> +	/* count tasks via DFS scan of the tree */
> +	while (1) {
> +		if (tasks_arr) {
> +			/* unlikely, but ... */
> +			if (nr == tasks_nr)
> +				return -EBUSY;	/* cleanup in cr_ctx_free() */

Returns without unlocking tasklist_lock?


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