mm: add thp_head (2be1d718) · Commits · 戴 / test

This is like compound_head() but compiles away when CONFIG_TRANSPARENT_HUGEPAGE is not enabled. Signed-off-by:

Zi Yan <ziy@nvidia.com> Cc: David Hildenbrand <david@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Link: http://lkml.kernel.org/r/20200629151959.15779-7-willy@infradead.org Signed-off-by:

include/linux/huge_mm.h

+15 −0

Original line number	Diff line number	Diff line
		@@ -259,6 +259,15 @@ static inline spinlock_t pud_trans_huge_lock(pud_t pud,
		return NULL;
		}

		/**
		* thp_head - Head page of a transparent huge page.
		* @page: Any page (tail, head or regular) found in the page cache.
		*/
		static inline struct page thp_head(struct page page)
		{
		return compound_head(page);
		}

		/**
		* thp_order - Order of a transparent huge page.
		* @page: Head page of a transparent huge page.
		@@ -335,6 +344,12 @@ static inline struct list_head page_deferred_list(struct page page)
		#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
		#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })

		static inline struct page thp_head(struct page page)
		{
		VM_BUG_ON_PGFLAGS(PageTail(page), page);
		return page;
		}

		static inline unsigned int thp_order(struct page *page)
		{
		VM_BUG_ON_PGFLAGS(PageTail(page), page);