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

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Message-ID: <29946.1302498571@jrobl>
Date:	Mon, 11 Apr 2011 14:09:31 +0900
From:	"J. R. Okajima" <hooanon05@...oo.co.jp>
To:	Peter Zijlstra <peterz@...radead.org>
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


Peter Zijlstra:
> On Fri, 2011-04-08 at 22:20 +0900, J. R. Okajima wrote:
> >=20
> > When spin_trylock(&dentry->d_lock) successfully acquired d_lock, does
> > the violation of locking order happen (or a deadlock, in worse case)?=20
>
> No, since a trylock never actually blocks a deadlock cannot occur.

Ah, exactly. I had to be sleeping when I wrote about deadlock.
How about the locking order? Do you think d_lock after dcache_lru_lock
is a problem?


J. R. Okajima
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