Define MADV_COLD and MADV_PAGEOUT from Linux 5.4

[Joseph Myers]

Linux 5.4 adds constants MADV_COLD and MADV_PAGEOUT (defined with the
same values on all architectures).  This patch adds them to
bits/mman-linux.h.

Tested for x86_64.

diff --git a/sysdeps/unix/sysv/linux/bits/mman-linux.h b/sysdeps/unix/sysv/linux/bits/mman-linux.h
index d6755c59d5..c0b11bfe24 100644
--- a/sysdeps/unix/sysv/linux/bits/mman-linux.h
+++ b/sysdeps/unix/sysv/linux/bits/mman-linux.h
@@ -87,6 +87,8 @@
 # define MADV_DODUMP	  17	/* Clear the MADV_DONTDUMP flag.  */
 # define MADV_WIPEONFORK  18	/* Zero memory on fork, child only.  */
 # define MADV_KEEPONFORK  19	/* Undo MADV_WIPEONFORK.  */
+# define MADV_COLD        20	/* Deactivate these pages.  */
+# define MADV_PAGEOUT     21	/* Reclaim these pages.  */
 # define MADV_HWPOISON	  100	/* Poison a page for testing.  */
 #endif
 

-- 
Joseph S. Myers
joseph@codesourcery.com