nptl: Add glibc.pthread.rseq tunable to control rseq registration

This tunable allows applications to register the rseq area instead
of glibc.

Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/sysdeps/nptl/dl-tunables.list b/sysdeps/nptl/dl-tunables.list
index ac5d053298..d24f4be0d0 100644
--- a/sysdeps/nptl/dl-tunables.list
+++ b/sysdeps/nptl/dl-tunables.list
@@ -27,5 +27,11 @@ glibc {
       type: SIZE_T
       default: 41943040
     }
+    rseq {
+      type: INT_32
+      minval: 0
+      maxval: 1
+      default: 1
+    }
   }
 }