[glibc] Define MADV_COLLAPSE from Linux 6.1

[glibc] Define MADV_COLLAPSE from Linux 6.1

[Joseph Myers]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=81a94a2ae34bac9c3d907bbe0468ba56914accb0

commit 81a94a2ae34bac9c3d907bbe0468ba56914accb0
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Dec 22 15:12:52 2022 +0000

    Define MADV_COLLAPSE from Linux 6.1
    
    Add the MADV_COLLAPSE constant from Linux 6.1 to bits/mman-linux.h and
    the hppa bits/mman.h.
    
    Tested for x86_64.

Diff:
---
 sysdeps/unix/sysv/linux/bits/mman-linux.h | 1 +
 sysdeps/unix/sysv/linux/hppa/bits/mman.h  | 2 ++
 2 files changed, 3 insertions(+)

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
 
diff --git a/sysdeps/unix/sysv/linux/hppa/bits/mman.h b/sysdeps/unix/sysv/linux/hppa/bits/mman.h
index acaa1cc3e7..1d895a5234 100644
--- a/sysdeps/unix/sysv/linux/hppa/bits/mman.h
+++ b/sysdeps/unix/sysv/linux/hppa/bits/mman.h
@@ -79,4 +79,6 @@
 # define MADV_WIPEONFORK 71	/* Zero memory on fork, child only.  */
 # undef MADV_KEEPONFORK
 # define MADV_KEEPONFORK 72	/* Undo MADV_WIPEONFORK.  */
+# undef MADV_COLLAPSE
+# define MADV_COLLAPSE   73	/* Synchronous hugepage collapse.  */
 #endif