On Mon, Jan 28, 2013 at 5:24 PM, Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
> + page_cache_get(page);
> + spin_lock_irq(&mapping->tree_lock);
> + page->mapping = mapping;
> + if (PageTransHuge(page)) {
> + int i;
> + for (i = 0; i < HPAGE_CACHE_NR; i++) {
> + page_cache_get(page + i);
Page count is raised twice for head page, why?
> + page[i].index = offset + i;
> + error = radix_tree_insert(&mapping->page_tree,
> + offset + i, page + i);
> + if (error) {
> + page_cache_release(page + i);
> + break;
> + }
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