From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 2/3] writeback: Add tracing to balance_dirty_pages
Date: Tue, 6 Jul 2010 22:20:55 -0400
Message-ID: <20100707022055.GB17385@infradead.org>
References: <1278459715-25720-1-git-send-email-david@fromorbit.com>
 <1278459715-25720-3-git-send-email-david@fromorbit.com>
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Cc: axboe@kernel.dk, linux-fsdevel@vger.kernel.org
To: Dave Chinner <david@fromorbit.com>
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> +
> +	TP_fast_assign(
> +		char *__no_bdi = "(no bdi)";
> +
> +		if (bdi)
> +			strncpy(__entry->name, dev_name(bdi->dev), 32);
> +		else
> +			strncpy(__entry->name, __no_bdi, 32);

I can't see a caller that doesn't have a bdi.