@@ -35,8 +35,9 @@ Using non-zero address tags in any of these locations may result in an
error code being returned, a (fatal) signal being raised, or other modes
of failure.
-For these reasons, passing non-zero address tags to the kernel via
-system calls is forbidden, and using a non-zero address tag for sp is
+Some initial work for supporting non-zero address tags passed to the
+kernel via system calls has been done, but the kernel doesn't provide
+any guarantees at this point. Using a non-zero address tag for sp is
strongly discouraged.
Programs maintaining a frame pointer and frame records that use non-zero
Add a note that work on passing tagged user pointers to the kernel via syscalls has started, but might not be complete yet. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- Documentation/arm64/tagged-pointers.txt | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)