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Date:   Thu, 20 Feb 2020 18:48:45 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Matthew Wilcox <willy@...radead.org>,
        <linux-fsdevel@...r.kernel.org>
CC:     <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 08/24] mm: Remove 'page_offset' from readahead loop

On 2/19/20 1:00 PM, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
> 
> Replace the page_offset variable with 'index + i'.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>  mm/readahead.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/mm/readahead.c b/mm/readahead.c
> index 8a25fc7e2bf2..83df5c061d33 100644
> --- a/mm/readahead.c
> +++ b/mm/readahead.c
> @@ -181,12 +181,10 @@ void __do_page_cache_readahead(struct address_space *mapping,
>  	 * Preallocate as many pages as we will need.
>  	 */
>  	for (i = 0; i < nr_to_read; i++) {
> -		pgoff_t page_offset = index + i;


ha, the naming mismatch I complained about in an earlier patch gets deleted
here, so we're good after all. :)

Looks good,

    Reviewed-by: John Hubbard <jhubbard@...dia.com>


thanks,
-- 
John Hubbard
NVIDIA

> -
> -		if (page_offset > end_index)
> +		if (index + i > end_index)
>  			break;
>  
> -		page = xa_load(&mapping->i_pages, page_offset);
> +		page = xa_load(&mapping->i_pages, index + i);
>  		if (page && !xa_is_value(page)) {
>  			/*
>  			 * Page already present?  Kick off the current batch of
> @@ -200,7 +198,7 @@ void __do_page_cache_readahead(struct address_space *mapping,
>  		page = __page_cache_alloc(gfp_mask);
>  		if (!page)
>  			break;
> -		page->index = page_offset;
> +		page->index = index + i;
>  		list_add(&page->lru, &page_pool);
>  		if (i == nr_to_read - lookahead_size)
>  			SetPageReadahead(page);
> 


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