From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [rfc][patch] mm, fs: warn on missing address space operations
Date: Mon, 22 Mar 2010 09:30:41 -0400
Message-ID: <20100322093041.2de599f8.akpm@linux-foundation.org>
References: <20100322053937.GA17637@laptop>
	<20100322005610.5dfa70b1.akpm@linux-foundation.org>
	<20100322104057.GG17637@laptop>
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Cc: Pekka Enberg <penberg@cs.helsinki.fi>,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
To: Nick Piggin <npiggin@suse.de>
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On Mon, 22 Mar 2010 21:40:57 +1100 Nick Piggin <npiggin@suse.de> wrote:

> > 
> > 	/* this fs should use block_invalidatepage() */
> > 	WARN_ON_ONCE(!invalidatepage);
> 
> Problem is that it doesn't give you the aop name (and call trace
> probably won't help).

Yes it does - you have the filename and line number.  You go there and
read "invalidatepage".  And the backtrace identifies the filesystem.