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Date:   Thu, 13 Feb 2020 20:21:37 -0800
From:   Matthew Wilcox <>
To:     John Hubbard <>
Subject: Re: [PATCH v5 01/13] mm: Fix the return type of

On Thu, Feb 13, 2020 at 07:19:53PM -0800, John Hubbard wrote:
> On 2/10/20 5:03 PM, Matthew Wilcox wrote:
> > @@ -161,7 +161,7 @@ unsigned int __do_page_cache_readahead(struct address_space *mapping,
> >  	unsigned long end_index;	/* The last page we want to read */
> >  	LIST_HEAD(page_pool);
> >  	int page_idx;
> What about page_idx, too? It should also have the same data type as nr_pages, as long as
> we're trying to be consistent on this point.
> Just want to ensure we're ready to handle those 2^33+ page readaheads... :)

Nah, this is just a type used internally to the function.  Getting the
API right for the callers is the important part.

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