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authorMatthew Wilcox (Oracle) <willy@infradead.org>2020-08-14 17:30:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-14 19:56:56 -0700
commit6ffbb45826f5d9ae09aa60cd88594b7816c96190 (patch)
treeae03d305c3418ebea06097226d3610d73e2751bf
parent419015675fef6c4b28689bd2ace559564c2e106c (diff)
mm: add thp_order
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>
-rw-r--r--include/linux/huge_mm.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 467302056e17..9521cfdf18ca 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -258,6 +258,19 @@ static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
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)))
@@ -317,6 +330,12 @@ 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 unsigned int thp_order(struct page *page)
+{
+ VM_BUG_ON_PGFLAGS(PageTail(page), page);
+ return 0;
+}
+
static inline int hpage_nr_pages(struct page *page)
{
VM_BUG_ON_PAGE(PageTail(page), page);