linux-kernel - Re:[RFC/PATCH PATCH 6/6] lockdep: Consider the rw_state of lock while validating the chain.

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Date:	Mon, 1 Jun 2009 13:05:47 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	ego@...ibm.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re:[RFC/PATCH PATCH 6/6] lockdep: Consider the rw_state of lock while 
	validating the chain.

<...>
>@@ -1767,9 +1773,15 @@ static int validate_chain(struct task_struct *curr, struct lockdep_map *lock,
>
> 		if (!ret)
> 			return 0;
>+
>+		if (ret != 2 && is_rec_read(hlock->rw_state))
>+			hlock->rw_state |= STATE_FIRST_RECURSIVE_READ;
>+
>+
> 		/*
> 		 * Add dependency only if this lock is not the head
>-		 * of the chain, and if it's not a secondary read-lock:
>+		 * of the chain, and if it's not the first instance of
>+		 * the recursive read-lock:

This change maybe don't show what you want to say.
Maybe it should be "or if it's the first instance of the recursive read-lock."

> 		 */
> 		if (!chain_head && ret != 2)
> 			if (!check_prevs_add(curr, hlock))
<...>
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