linux-kernel - Re: [PATCH] mm: Use GFP_KERNEL allocation for the page cache in page_cache

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Date:	Wed, 18 Mar 2015 10:32:57 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Al Viro <viro@...iv.linux.org.uk>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>, Neil Brown <neilb@...e.de>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Sage Weil <sage@...tank.com>, Mark Fasheh <mfasheh@...e.com>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: Use GFP_KERNEL allocation for the page cache in page_cache_read

On 03/18/2015 10:09 AM, Michal Hocko wrote:

> diff --git a/mm/filemap.c b/mm/filemap.c
> index 968cd8e03d2e..26f62ba79f50 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -1752,7 +1752,7 @@ static int page_cache_read(struct file *file, pgoff_t offset)
>  	int ret;
>  
>  	do {
> -		page = page_cache_alloc_cold(mapping);
> +		page = __page_cache_alloc(GFP_KERNEL|__GFP_COLD);
>  		if (!page)
>  			return -ENOMEM;

Won't this break on highmem systems, by failing to
allocate the page cache from highmem, where previously
it would?

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