Re: [PATCH v4 04/11] liveupdate: Protect FLB lists with luo_register_rwlock

[Mike Rapoport]

On Mon, Apr 13, 2026 at 06:51:20PM +0000, Pasha Tatashin wrote:
> Because liveupdate FLB objects will soon drop their persistent module
> references when registered, list traversals must be protected against
> concurrent module unloading.
> 
> To provide this protection, utilize the global luo_register_rwlock.
> It protects the global registry of FLBs and the handler's specific
> list of FLB dependencies.
> 
> Read locks are used during concurrent list traversals (e.g., during
> preservation and serialization). 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>

> ---
>  include/linux/liveupdate.h  |  1 +
>  kernel/liveupdate/luo_flb.c | 14 ++++++++++++++
>  2 files changed, 15 insertions(+)

-- 
Sincerely yours,
Mike.