Merge branch 'mpls-remove-rtnl-dependency'

Kuniyuki Iwashima says:

====================
mpls: Remove RTNL dependency.

MPLS uses RTNL

  1) to guarantee the lifetime of struct mpls_nh.nh_dev
  2) to protect net->mpls.platform_label

, but neither actually requires RTNL.

If struct mpls_nh holds a refcnt for nh_dev, we do not need RTNL,
and it can be replaced with a dedicated mutex.

The series removes RTNL from net/mpls/.

Overview:

  Patch 1 is misc cleanup.

  Patch 2 - 9 are prep to drop RTNL for RTM_{NEW,DEL,GET}ROUTE
  handlers.

  Patch 10 & 11 converts mpls_dump_routes() and RTM_GETNETCONF to RCU.

  Patch 12 replaces RTNL with a new per-netns mutex.

  Patch 13 drops RTNL from RTM_{NEW,DEL,GET}ROUTE.
====================

Link: https://patch.msgid.link/20251029173344.2934622-1-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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