mm: kill one if loop in __free_pages_bootmem()
We should not check loop+1 with loop end in loop body. Just duplicate two lines code to avoid it. That will help a bit when we have huge amount of pages on system with 16TiB memory. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: Mel Gorman <mgorman@suse.de> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -751,19 +751,19 @@ static void __free_pages_ok(struct page *page, unsigned int order)
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void __init __free_pages_bootmem(struct page *page, unsigned int order)
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void __init __free_pages_bootmem(struct page *page, unsigned int order)
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{
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{
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unsigned int nr_pages = 1 << order;
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unsigned int nr_pages = 1 << order;
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struct page *p = page;
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unsigned int loop;
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unsigned int loop;
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prefetchw(page);
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prefetchw(p);
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for (loop = 0; loop < nr_pages; loop++) {
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for (loop = 0; loop < (nr_pages - 1); loop++, p++) {
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struct page *p = &page[loop];
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prefetchw(p + 1);
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if (loop + 1 < nr_pages)
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prefetchw(p + 1);
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__ClearPageReserved(p);
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__ClearPageReserved(p);
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set_page_count(p, 0);
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set_page_count(p, 0);
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}
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}
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__ClearPageReserved(p);
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set_page_count(p, 0);
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page_zone(page)->managed_pages += 1 << order;
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page_zone(page)->managed_pages += nr_pages;
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set_page_refcounted(page);
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set_page_refcounted(page);
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__free_pages(page, order);
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__free_pages(page, order);
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}
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}
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