linux-kernel - Re: [PATCH v7 10/24] mm: Add readahead address space operation

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Message-ID: <20200220151048.GW24185@bombadil.infradead.org>
Date:   Thu, 20 Feb 2020 07:10:48 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Zi Yan <ziy@...dia.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        ocfs2-devel@....oracle.com, linux-xfs@...r.kernel.org
Subject: Re: [PATCH v7 10/24] mm: Add readahead address space operation

On Thu, Feb 20, 2020 at 10:00:30AM -0500, Zi Yan wrote:
> > +/* The index of the first page in this readahead block */
> > +static inline unsigned int readahead_index(struct readahead_control *rac)
> > +{
> > +	return rac->_index;
> > +}
> 
> rac->_index is pgoff_t, so readahead_index() should return the same type, right?
> BTW, pgoff_t is unsigned long.

Oh my goodness!  Thank you for spotting that.  Fortunately, it's only
currently used by tracepoints, so it wasn't causing any trouble, but
that's a nasty landmine to leave lying around.  Fixed:

static inline pgoff_t readahead_index(struct readahead_control *rac)