linux-kernel - Re: [PATCH v6 06/19] mm: rename readahead loop variable to 'i'

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Date:   Tue, 18 Feb 2020 15:11:38 -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 v6 06/19] mm: rename readahead loop variable to 'i'

On 2/17/20 10:45 AM, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
> 
> Change the type of page_idx to unsigned long, and rename it -- it's
> just a loop counter, not a page index.
> 
> Suggested-by: John Hubbard <jhubbard@...dia.com>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>  mm/readahead.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 

Looks good,

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


thanks,
-- 
John Hubbard
NVIDIA

> diff --git a/mm/readahead.c b/mm/readahead.c
> index 74791b96013f..bdc5759000d3 100644
> --- a/mm/readahead.c
> +++ b/mm/readahead.c
> @@ -156,7 +156,7 @@ void __do_page_cache_readahead(struct address_space *mapping,
>  	struct inode *inode = mapping->host;
>  	unsigned long end_index;	/* The last page we want to read */
>  	LIST_HEAD(page_pool);
> -	int page_idx;
> +	unsigned long i;
>  	loff_t isize = i_size_read(inode);
>  	gfp_t gfp_mask = readahead_gfp_mask(mapping);
>  	struct readahead_control rac = {
> @@ -174,7 +174,7 @@ void __do_page_cache_readahead(struct address_space *mapping,
>  	/*
>  	 * Preallocate as many pages as we will need.
>  	 */
> -	for (page_idx = 0; page_idx < nr_to_read; page_idx++) {
> +	for (i = 0; i < nr_to_read; i++) {
>  		struct page *page;
>  
>  		if (offset > end_index)
> @@ -198,7 +198,7 @@ void __do_page_cache_readahead(struct address_space *mapping,
>  			break;
>  		page->index = offset;
>  		list_add(&page->lru, &page_pool);
> -		if (page_idx == nr_to_read - lookahead_size)
> +		if (i == nr_to_read - lookahead_size)
>  			SetPageReadahead(page);
>  		rac._nr_pages++;
>  		offset++;
>