linux-kernel - Re: [PATCH] ext4: Add a stub for mpage_da

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Message-ID: <20090930133335.GA14585@infradead.org>
Date:	Wed, 30 Sep 2009 09:33:35 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Josh Stone <jistone@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH] ext4: Add a stub for mpage_da_data in the trace header

On Tue, Sep 29, 2009 at 02:40:07PM -0700, Josh Stone wrote:
> The tracepoint ext4_da_write_pages has a struct mpage_da_data*
> parameter, but that struct is only defined in fs/ext4/ext4.h.  This
> patch adds a forward declaration for that struct, so this tracepoint
> header can still be used by tools like SystemTap.

That's not what the tracepoints are for anyway.  No hacks for out of
tree crap like this please - just use the trace buffer directly like
ftrace and then you don't actually need any data types.

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