thp: kvm mmu transparent hugepage support
This should work for both hugetlbfs and transparent hugepages.
[akpm@linux-foundation.org: bring forward PageTransCompound() addition for bisectability]
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 4835cae..907f160 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -409,6 +409,18 @@
#endif /* !PAGEFLAGS_EXTENDED */
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+static inline int PageTransCompound(struct page *page)
+{
+ return PageCompound(page);
+}
+#else
+static inline int PageTransCompound(struct page *page)
+{
+ return 0;
+}
+#endif
+
#ifdef CONFIG_MMU
#define __PG_MLOCKED (1 << PG_mlocked)
#else