From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: linux-next: manual merge of the tip tree
Date: Wed, 16 Oct 2013 22:52:07 +0200
Message-ID: <20131016205207.GE10651@twins.programming.kicks-ass.net>
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To: NeilBrown <neilb@suse.de>
Cc: Thierry Reding <thierry.reding@gmail.com>, Shaohua Li <shli@kernel.org>, Ingo Molnar <mingo@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>, linux-next@vger.kernel.org, linux-kernel@vger.kernel.org

Hey Neil;

it looks like its one of your patches isn't it?

http://www.spinics.net/lists/raid/msg44100.html
http://www.spinics.net/lists/raid/msg44101.html

Given that I can't find them in a lkml archive means nobody's ever seen
those patches.

Anyway; has that 3/3 patch ever been ran with lockdep enabled? 

Stuff like:

+	for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++)
+		spin_lock_init(conf->hash_locks + i);

And:

+static void __lock_all_hash_locks(struct r5conf *conf)
+{
+	int i;
+	for (i = 0; i < NR_STRIPE_HASH_LOCKS; i++)
+		spin_lock(conf->hash_locks + i);
+}

Tends to complain real loud.

This leaves one to wonder... 
  'fancy' locking scheme:1, validation effort:0