Re: [PATCH] lib: fix data race in rhashtable_rehash_one

From: Thomas Graf
Date: Tue Sep 22 2015 - 04:20:10 EST


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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