commit 12ff80b312c11b0284df7a1c5cb9be6418f85228
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date:   Tue Feb 2 15:02:09 2021 +0000

    Remove PR_TAGGED_ADDR_ENABLE from sys/prctl.h
    
    The value of PR_TAGGED_ADDR_ENABLE was incorrect in the installed
    headers and the prctl command macros were missing that are needed
    for it to be useful (PR_SET_TAGGED_ADDR_CTRL).  Linux headers have
    the definitions since 5.4 so it's widely available, we don't need
    to repeat these definitions.  The remaining definitions are from
    Linux 5.10.
    
    To build glibc with --enable-memory-tagging, Linux 5.4 headers and
    binutils 2.33.1 or newer is needed.
    
    Reviewed-by: DJ Delorie <dj@redhat.com>
    (cherry picked from commit f4596d9540021265a99697fceef8a434c47e8bcf)

diff --git a/sysdeps/unix/sysv/linux/sys/prctl.h b/sysdeps/unix/sysv/linux/sys/prctl.h
index 00817ff0f14c617d..c9048c7cdb3e4d26 100644
--- a/sysdeps/unix/sysv/linux/sys/prctl.h
+++ b/sysdeps/unix/sysv/linux/sys/prctl.h
@@ -25,10 +25,6 @@
    we're picking up...  */
 
 /* Memory tagging control operations (for AArch64).  */
-#ifndef PR_TAGGED_ADDR_ENABLE
-# define PR_TAGGED_ADDR_ENABLE	(1UL << 8)
-#endif
-
 #ifndef PR_MTE_TCF_SHIFT
 # define PR_MTE_TCF_SHIFT	1
 # define PR_MTE_TCF_NONE	(0UL << PR_MTE_TCF_SHIFT)