Re: [PATCHv3 6/8] x86/mm: Provide ARCH_GET_UNTAG_MASK and ARCH_ENABLE_TAGGED_ADDR

[Andy Lutomirski]

On Thu, Jun 16, 2022, at 9:54 AM, Kirill A. Shutemov wrote:
> On Thu, Jun 16, 2022 at 11:44:59AM +0200, Peter Zijlstra wrote:
>> > get_nr_threads() is the wrong thing.  Either look at mm->mm_users or
>> > find a way to get rid of this restriction entirely.
>> 
>> mm->mm_users should indeed be sufficient here.
>
> Hm. kthread_use_mm() doesn't bump mm_users. Do we care?

I think the idea is that the kthread in question is expected to hold an mm_users reference. 

>
> -- 
>  Kirill A. Shutemov