On Fri, Mar 03, 2017 at 01:27:10PM +0100, Jiri Slaby wrote:

There is code duplicated over all architecture's headers for
futex_atomic_op_inuser. Namely op decoding, access_ok check for uaddr,
and comparison of the result.

Remove this duplication and leave up to the arches only the needed
assembly which is now in arch_futex_atomic_op_inuser.

Note that s390 removed access_ok check in d12a29703 ("s390/uaccess:
remove pointless access_ok() checks") as access_ok there returns true.
We introduce it back to the helper for the sake of simplicity (it gets
optimized away anyway).

Signed-off-by: Jiri Slaby <redacted>
---
 arch/s390/include/asm/futex.h       | 23 ++++-------------
 include/asm-generic/futex.h         | 50 +++++++------------------------------
 kernel/futex.c                      | 36 ++++++++++++++++++++++++++

Looks good to me and still boots on s390. Therefore for the s390 bits:
Acked-by: Heiko Carstens <redacted>

Thanks!