linux-kernel - Re: [PATCH 1/3] mm/page_isolation: return last tested pfn rather than failure indicator

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Date:	Tue, 10 Nov 2015 17:05:12 +0100
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Joonsoo Kim <js1304@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 1/3] mm/page_isolation: return last tested pfn rather than failure indicator

On Mon, Nov 09 2015, Joonsoo Kim wrote:
> This is preparation step to report test failed pfn in new tracepoint
> to analyze cma allocation failure problem. There is no functional change
> in this patch.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Michal Nazarewicz <mina86@...a86.com>

> ---
>  mm/page_isolation.c | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
>
> @@ -266,10 +264,11 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
>  	/* Check all pages are free or marked as ISOLATED */
>  	zone = page_zone(page);
>  	spin_lock_irqsave(&zone->lock, flags);
> -	ret = __test_page_isolated_in_pageblock(start_pfn, end_pfn,
> +	pfn = __test_page_isolated_in_pageblock(start_pfn, end_pfn,
>  						skip_hwpoisoned_pages);
>  	spin_unlock_irqrestore(&zone->lock, flags);
> -	return ret ? 0 : -EBUSY;
> +
> +	return (pfn < end_pfn) ? -EBUSY : 0;

Parens aren’t necessary.  No strong feelings.

>  }
>  
>  struct page *alloc_migrate_target(struct page *page, unsigned long private,

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