From: "Matthew Wilcox (Oracle)" willy@infradead.org
commit 6ffbb45826f5d9ae09aa60cd88594b7816c96190 upstream
This function returns the order of a transparent huge page. It compiles to 0 if CONFIG_TRANSPARENT_HUGEPAGE is disabled.
Signed-off-by: Matthew Wilcox (Oracle) willy@infradead.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Reviewed-by: William Kucharski william.kucharski@oracle.com Reviewed-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/20200629151959.15779-4-willy@infradead.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/linux/huge_mm.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
--- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -231,6 +231,19 @@ static inline spinlock_t *pud_trans_huge else return NULL; } + +/** + * thp_order - Order of a transparent huge page. + * @page: Head page of a transparent huge page. + */ +static inline unsigned int thp_order(struct page *page) +{ + VM_BUG_ON_PGFLAGS(PageTail(page), page); + if (PageHead(page)) + return HPAGE_PMD_ORDER; + return 0; +} + static inline int hpage_nr_pages(struct page *page) { if (unlikely(PageTransHuge(page))) @@ -290,6 +303,12 @@ static inline struct list_head *page_def #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; }) #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
+static inline unsigned int thp_order(struct page *page) +{ + VM_BUG_ON_PGFLAGS(PageTail(page), page); + return 0; +} + #define hpage_nr_pages(x) 1
static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)