linux-kernel - Re: [patch] mm: fix lockless pagecache reordering bug (was Re: BUG: soft lockup

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Message-ID:  <496383E0.50102@ftml.net>
Date:	Tue, 06 Jan 2009 10:16:32 -0600
From:	Roman Kononov <kononov@...l.net>
To:	linux-kernel@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject:  Re: [patch] mm: fix lockless pagecache reordering bug (was Re: BUG:
 soft lockup - is this XFS problem?)

On 2009-01-05 20:05 Nick Piggin said the following:
> Subject: mm lockless pagecache barrier fix
>  static inline void *radix_tree_deref_slot(void **pslot)
>  {
> -	void *ret = *pslot;
> +	void *ret = rcu_dereference(*pslot);
>  	if (unlikely(radix_tree_is_indirect_ptr(ret)))
>  		ret = RADIX_TREE_RETRY;
>  	return ret;

3 systems are working fine for a few hours with the patch. They would 
fail within 20 minutes without it.

Thanks.

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