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-rw-r--r--sysdeps/unix/sysv/linux/bits/mman-linux.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/bits/mman-linux.h b/sysdeps/unix/sysv/linux/bits/mman-linux.h
index 1fb7f888aa..c3818ce356 100644
--- a/sysdeps/unix/sysv/linux/bits/mman-linux.h
+++ b/sysdeps/unix/sysv/linux/bits/mman-linux.h
@@ -91,6 +91,7 @@
 				   writable.  */
 # define MADV_DONTNEED_LOCKED 24 /* Like MADV_DONTNEED, but drop
 				    locked pages too.  */
+# define MADV_COLLAPSE    25	/* Synchronous hugepage collapse.  */
 # define MADV_HWPOISON	  100	/* Poison a page for testing.  */
 #endif