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Subject: Re: [Lhms-devel] [RFC] buddy allocator without bitmap  [2/4]
From: Dave Hansen <haveblue@us.ibm.com>
To: Hiroyuki KAMEZAWA <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Linux Kernel ML <linux-kernel@vger.kernel.org>,
       linux-mm <linux-mm@kvack.org>, lhms <lhms-devel@lists.sourceforge.net>,
       William Lee Irwin III <wli@holomorphy.com>
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References: <412DD1AA.8080408@jp.fujitsu.com>
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Date: Thu, 26 Aug 2004 08:50:02 -0700
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On Thu, 2004-08-26 at 05:03, Hiroyuki KAMEZAWA wrote:
> -		MARK_USED(index + size, high, area);
> +		page[size].flags |= (1 << PG_private);
> +		page[size].private = high;
>   	}
>   	return page;
>   }
...
> +		/* Atomic operation is needless here */
> +		page->flags &= ~(1 << PG_private);

See linux/page_flags.h:

#define SetPagePrivate(page)    set_bit(PG_private, &(page)->flags)
#define ClearPagePrivate(page)  clear_bit(PG_private, &(page)->flags)
#define PagePrivate(page)       test_bit(PG_private, &(page)->flags)

-- Dave