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From: Mel Gorman on 15 Apr 2010 09:40
On Thu, Apr 15, 2010 at 07:24:05PM +0900, KOSAKI Motohiro wrote:
> This patch is used from [3/4]
>
> ===================================
> Free_hot_cold_page() and __free_pages_ok() have very similar
> freeing preparation. This patch make consolicate it.
>
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro(a)jp.fujitsu.com>
> ---
> mm/page_alloc.c | 40 +++++++++++++++++++++-------------------
> 1 files changed, 21 insertions(+), 19 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 88513c0..ba9aea7 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -599,20 +599,23 @@ static void free_one_page(struct zone *zone, struct page *page, int order,
> spin_unlock(&zone->lock);
> }
>
> -static void __free_pages_ok(struct page *page, unsigned int order)
> +static int free_pages_prepare(struct page *page, unsigned int order)
> {

You don't appear to do anything with the return value. bool? Otherwise I
see no problems

Acked-by: Mel Gorman <mel(a)csn.ul.ie>

> - unsigned long flags;
> int i;
> int bad = 0;
> - int wasMlocked = __TestClearPageMlocked(page);
>
> trace_mm_page_free_direct(page, order);
> kmemcheck_free_shadow(page, order);
>
> - for (i = 0 ; i < (1 << order) ; ++i)
> - bad += free_pages_check(page + i);
> + for (i = 0 ; i < (1 << order) ; ++i) {
> + struct page *pg = page + i;
> +
> + if (PageAnon(pg))
> + pg->mapping = NULL;
> + bad += free_pages_check(pg);
> + }
> if (bad)
> - return;
> + return -EINVAL;
>
> if (!PageHighMem(page)) {
> debug_check_no_locks_freed(page_address(page),PAGE_SIZE<<order);
> @@ -622,6 +625,17 @@ static void __free_pages_ok(struct page *page, unsigned int order)
> arch_free_page(page, order);
> kernel_map_pages(page, 1 << order, 0);
>
> + return 0;
> +}
> +
> +static void __free_pages_ok(struct page *page, unsigned int order)
> +{
> + unsigned long flags;
> + int wasMlocked = __TestClearPageMlocked(page);
> +
> + if (free_pages_prepare(page, order))
> + return;
> +
> local_irq_save(flags);
> if (unlikely(wasMlocked))
> free_page_mlock(page);
> @@ -1107,21 +1121,9 @@ void free_hot_cold_page(struct page *page, int cold)
> int migratetype;
> int wasMlocked = __TestClearPageMlocked(page);
>
> - trace_mm_page_free_direct(page, 0);
> - kmemcheck_free_shadow(page, 0);
> -
> - if (PageAnon(page))
> - page->mapping = NULL;
> - if (free_pages_check(page))
> + if (free_pages_prepare(page, 0))
> return;
>
> - if (!PageHighMem(page)) {
> - debug_check_no_locks_freed(page_address(page), PAGE_SIZE);
> - debug_check_no_obj_freed(page_address(page), PAGE_SIZE);
> - }
> - arch_free_page(page, 0);
> - kernel_map_pages(page, 1, 0);
> -
> migratetype = get_pageblock_migratetype(page);
> set_page_private(page, migratetype);
> local_irq_save(flags);
> --
> 1.6.5.2
>
>
>

--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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