Re: [PATCH v6 0/5] pid_namespace: make init creation more flexible

[Christian Brauner <brauner@kernel.org>]

On Wed, 18 Mar 2026 13:21:48 +0100, Pavel Tikhomirov wrote:
> The first patch properly annotates accesses to ->child_reaper with
> _ONCE macroses, to protect unlocked accesses from possible cpu/compiler
> optimization problems.
> 
> The second patch makes sure that the init is always a first process in
> the pid namespace, previously this was only checked for set_tid case.
> 
> [...]

Applied to the kernel-7.1.misc branch of the vfs/vfs.git tree.
Patches in the kernel-7.1.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: kernel-7.1.misc

[1/5] pid_namespace: avoid optimization of accesses to ->child_reaper
      https://git.kernel.org/vfs/vfs/c/d9c857aee2eb
[2/5] pid: check init is created first after idr alloc
      https://git.kernel.org/vfs/vfs/c/39c8806e2d88
[3/5] pid_namespace: allow opening pid_for_children before init was created
      https://git.kernel.org/vfs/vfs/c/a3bdc23ba8ea
[4/5] selftests: Add tests for creating pidns init via setns
      https://git.kernel.org/vfs/vfs/c/7c5219e1a606
[5/5] MAINTAINERS: add a new entry for testing pidns init creation via setns
      https://git.kernel.org/vfs/vfs/c/2b46715fd9ec