Re: [PATCH v3 1/8] user_namespace: Use acquire/release for nr_extents synchronization

[Andy Shevchenko]

On Wed, Sep 02, 2026 at 03:47:58PM +0800, Jinjie Ruan wrote:
> Replace smp_wmb()/smp_rmb() with smp_store_release()/smp_load_acquire()
> when publishing and consuming `nr_extents`. This expresses the
> publish/subscribe pattern more clearly and allows architectures with
> native acquire/release instructions (e.g. arm64's STLR/LDAR) to avoid
> the cost of full one-way barriers (DMB ISHST/ISHLD).
> 
> No functional change intended.

Please, locate Cc list...

> Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
> Cc: Christian Brauner <brauner@xxxxxxxxxx>
> Cc: Jan Kara <jack@xxxxxxx>
> Cc: Seth Forshee <sforshee@xxxxxxxxxx>
> Cc: Kees Cook <kees@xxxxxxxxxx>
> Cc: Aleksa Sarai <cyphar@xxxxxxxxxx>o

...(all the above)...

> Assisted-by: DeepSeek:DeepSeek-V3
> Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
> ---

...somewhere here. It will have the same effect on the email thread and it will
unload the commit message from the unneeded noise.

> v2:
> - Add missing load replace in copy_mnt_idmap()
> ---
>  fs/mnt_idmapping.c      |  5 ++---
>  kernel/user_namespace.c | 24 +++++++++++++-----------
>  2 files changed, 15 insertions(+), 14 deletions(-)

...

This comment applies to the whole series.
Also note, `b4 trailers` can handle that, you can keep the

  ---
  Cc: ...

in the local Git. You can find some details in the subthread here
https://lore.kernel.org/lkml/20260123113708.416727-19-bigeasy@xxxxxxxxxxxxx/

-- 
With Best Regards,
Andy Shevchenko