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Merge branch 'netconsole-replace-target_list_lock-by-rcu-on-userdata-hot-path'

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Breno Leitao says:

====================
netconsole: replace target_list_lock by RCU on userdata hot path

I would like to move netconsole to use RCU on the hot path for
a while instead of target_list_lock. My goal is to have no lock on the
tx side at all and eventually drop CON_NBCON_ATOMIC_UNSAFE, if that is
possible [1].

Start removing target_list_lock on certain parts of the code. This patch
transforms the userdata array into a RCU-protected pointer, and uses the
dynamic mutex as the write lock.

Added a selftest, given we didn't have any netconsole selftest for
userdata operations. Feel free to drop it if this is not useful, dear
maintainers.

Link: https://lore.kernel.org/all/20251121-nbcon-v1-0-503d17b2b4af@debian.org/[1]

Signed-off-by: Breno Leitao <leitao@debian.org>
====================

Link: https://patch.msgid.link/20260810-netcons-userdata-rcu-v3-0-f65557f769ce@debian.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Paolo Abeni 2026-08-13 15:05:04 +02:00
commit 3205699d79
3 changed files with 286 additions and 36 deletions
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