On Mon, Jul 23, 2007 at 09:53:10PM -0700, Andrew Morton wrote:
> On Tue, 24 Jul 2007 12:32:15 +0800 Fengguang Wu <[email protected]> wrote:
>
> > On Mon, Jul 23, 2007 at 08:55:35PM -0700, Andrew Morton wrote:
> > > On Tue, 24 Jul 2007 10:00:12 +0800 Fengguang Wu <[email protected]> wrote:
> > >
> > > > @@ -342,11 +342,9 @@ ondemand_readahead(struct address_space
> > > > bool hit_readahead_marker, pgoff_t offset,
> > > > unsigned long req_size)
> > > > {
> > > > - int max; /* max readahead pages */
> > > > - int sequential;
> > > > -
> > > > - max = ra->ra_pages;
> > > > - sequential = (offset - ra->prev_index <= 1UL) || (req_size > max);
> > > > + int max = ra->ra_pages; /* max readahead pages */
> > > > + pgoff_t prev_offset;
> > > > + int sequential;
> > > >
> > > > /*
> > > > * It's the expected callback offset, assume sequential access.
> > > > @@ -360,6 +358,9 @@ ondemand_readahead(struct address_space
> > > > goto readit;
> > > > }
> > > >
> > > > + prev_offset = ra->prev_pos >> PAGE_CACHE_SHIFT;
> > > > + sequential = offset - prev_offset <= 1UL || req_size > max;
> > >
> > > It's a bit pointless using an opaque type for prev_offset here, and then
> > > encoding the knowledge that it is implemented as "unsigned long".
> > >
> > > It's a minor thing, but perhaps just "<= 1" would make more sense here.
> >
> > Yeah, "<= 1" is OK. But the expression still requires pgoff_t to be
> > 'unsigned' to work correctly.
> >
> > So what about "<= 1U"?
>
> umm, if one really cared one could do
>
> <expr> == 1 || <expr> == 0
Yeah, I'd prefer this if we are to change it.
> or something. But whatever - let's leave it as-is.
-
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