linux-kernel - Re: Q. locking order of dcache_lru

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Message-ID: <1302369133.2388.1.camel@twins>
Date:	Sat, 09 Apr 2011 19:12:13 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"J. R. Okajima" <hooanon05@...oo.co.jp>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Nick Piggin <npiggin@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: Q. locking order of dcache_lru_lock

On Fri, 2011-04-08 at 22:20 +0900, J. R. Okajima wrote:
> 
> When spin_trylock(&dentry->d_lock) successfully acquired d_lock, does
> the violation of locking order happen (or a deadlock, in worse case)? 

No, since a trylock never actually blocks a deadlock cannot occur.
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