linux-4.4.1/PageTransTail() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-4.4.1/PageTransTail() へ行く。
  • 1 (2017-09-25 (月) 10:55:52)

参照元†

説明†

• パス: linux-4.4.1/include/linux/page-flags.h

• FIXME: これは何？
  • 説明

引数†

• struct page *page
  • linux-4.4.1/page

返り値†

• int

参考†

実装†

#ifdef CONFIG_TRANSPARENT_HUGEPAGE

• • linux-4.4.1/CONFIG_TRANSPARENT_HUGEPAGE

/*
 * PageHuge() only returns true for hugetlbfs pages, but not for
 * normal or transparent huge pages.
 *
 * PageTransHuge() returns true for both transparent huge and
 * hugetlbfs pages, but not normal pages. PageTransHuge() can only be
 * called only in the core VM paths where hugetlbfs pages can't exist.
 */
static inline int PageTransHuge(struct page *page)
{
	VM_BUG_ON_PAGE(PageTail(page), page);
	return PageHead(page);
}

• • linux-4.4.1/VM_BUG_ON_PAGE()
  • linux-4.4.1/PageTail()
  • linux-4.4.1/PageHead()

/*
 * PageTransCompound returns true for both transparent huge pages
 * and hugetlbfs pages, so it should only be called when it's known
 * that hugetlbfs pages aren't involved.
 */
static inline int PageTransCompound(struct page *page)
{
	return PageCompound(page);
}

• • linux-4.4.1/PageCompound()

/*
 * PageTransTail returns true for both transparent huge pages
 * and hugetlbfs pages, so it should only be called when it's known
 * that hugetlbfs pages aren't involved.
 */
static inline int PageTransTail(struct page *page)
{
	return PageTail(page);
}

• • linux-4.4.1/PageTail()

#else

static inline int PageTransHuge(struct page *page)
{
	return 0;
}

static inline int PageTransCompound(struct page *page)
{
	return 0;
}

static inline int PageTransTail(struct page *page)
{
	return 0;
}
#endif

コメント†