Re: [PATCH v4 03/11] liveupdate: Protect file handler list with rwsem

[Mike Rapoport]

On Mon, Apr 13, 2026 at 06:51:19PM +0000, Pasha Tatashin wrote:
> Because liveupdate file handlers will no longer hold a module reference
> when registered, we must ensure that the access to the handler list is
> protected against concurrent module unloading.
> 
> Utilize the global luo_register_rwlock to protect the global registry of
> file handlers. Read locks are taken during list traversals in
> luo_preserve_file() and luo_file_deserialize(). Write locks are taken
> during registration and unregistration.
> 
> Signed-off-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
> Reviewed-by: Pratyush Yadav (Google) <pratyush@xxxxxxxxxx>

Reviewed-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>

> ---
>  kernel/liveupdate/luo_core.c     |  6 ++++++
>  kernel/liveupdate/luo_file.c     | 31 +++++++++++++++++++++++--------
>  kernel/liveupdate/luo_internal.h |  2 ++
>  3 files changed, 31 insertions(+), 8 deletions(-)
> 

-- 
Sincerely yours,
Mike.