[PATCH net-next v2 0/5] net: convert four more protocols to getsockopt_iter

Continue the work to convert protocols to the new getsockopt_iter API.

Convert four additional getsockopt implementations to the new
sockopt_t/getsockopt_iter callback:

  - MCTP
  - LLC
  - X.25
  - KCM

These are mechanical, ABI-preserving conversions following the same
pattern as the previously converted protocols (af_packet, can/raw,
af_netlink, af_vsock): the (char __user *optval, int __user *optlen)
pair is replaced with a single sockopt_t *opt that carries the buffer
length on input and the returned size on output, and exposes an iov_iter
for the copy-out path. put_user()/copy_to_user() pairs are replaced with
a single copy_to_iter() per option, and the wrapper in
do_sock_getsockopt() handles writing optlen back to userspace.

I picked these four because each is small and self-contained.

Signed-off-by: Breno Leitao <[email protected]>
---
Changes in v2:
- Fix kdoc as suggested by Jakub.
- Drop the CAN patches; they will be sent separately through the
  linux-can tree.
- Add X.25 and KCM conversions, keeping the series at four protocols.
- Link to v1: https://patch.msgid.link/[email protected]

---
Breno Leitao (5):
      mctp: convert to getsockopt_iter
      llc: convert to getsockopt_iter
      x25: convert to getsockopt_iter
      kcm: convert to getsockopt_iter
      selftests: net: getsockopt_iter: cleanup

 net/kcm/kcmsock.c                             |  16 ++--
 net/llc/af_llc.c                              |  18 ++---
 net/mctp/af_mctp.c                            |  10 +--
 net/x25/af_x25.c                              |  16 ++--
 tools/testing/selftests/net/getsockopt_iter.c | 109 +++++++++++++++++++++++---
 5 files changed, 124 insertions(+), 45 deletions(-)
---
base-commit: c1e5127b577c6b88fa48e532616932ae978528d5
change-id: 20260505-getsock_two-abad19643336

Best regards,
--  
Breno Leitao <[email protected]>