linux-kernel - Re: [PATCH 03/10] readahead: combine file_ra_state.prev_index/prev_offset into prev

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Message-ID: <20070724034801.GA7310@mail.ustc.edu.cn>
Date:	Tue, 24 Jul 2007 11:48:01 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 03/10] readahead: combine file_ra_state.prev_index/prev_offset into prev_pos

On Mon, Jul 23, 2007 at 08:52:41PM -0700, Andrew Morton wrote:
> On Tue, 24 Jul 2007 10:00:12 +0800 Fengguang Wu <wfg@...l.ustc.edu.cn> wrote:
> 
> > -	ra->prev_index = page->index;
> > +	ra->prev_pos = page->index << PAGE_CACHE_SHIFT;
> 
> bug!  The rhs will get truncated befire it gets assigned to
> the lhs.  Need to cast page->index to loff_t.
> 
> I'll fix this one up.  Please review the other patches for this?

Thank you. Be sure to update *all* the lines:
        ra->prev_pos = page->index << PAGE_CACHE_SHIFT

Other places should have been taken care of.

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