linux-kernel - Re: [PATCH] lib: fix data race in rhashtable_rehash

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Message-ID: <20150922081958.GC13047@pox.localdomain>
Date:	Tue, 22 Sep 2015 10:19:58 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Dmitry Vyukov <dvyukov@...gle.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kcc@...gle.com,
	andreyknvl@...gle.com, glider@...gle.com, ktsan@...glegroups.com,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH] lib: fix data race in rhashtable_rehash_one

On 09/21/15 at 04:03pm, Eric Dumazet wrote:
> What I said is :
> 
> In @head you already have the correct nulls value, from hash table.
> 
> You do not need to recompute this value, and/or test if hash table chain
> is empty.
> 
> If hash bucket is empty, it contains the appropriate NULLS value.
> 
> If you are paranoiac add this debugging check :
> 
> if (rht_is_a_nulls(head))
>     BUG_ON(head != (struct rhash_head *)rht_marker(ht, new_hash));
> 
> 
> Therefore, simply fix the bug and unnecessary code with :

You are absolutely right Eric. Do you want to revise your patch Dmitry?
Eric's proposed fix absolutely the best way to fix this.
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