Re: [PATCH v6 01/12] x86/mm: make MMU_GATHER_RCU_TABLE_FREE unconditional

[David Hildenbrand]

On 20.01.25 03:40, Rik van Riel wrote:
> Currently x86 uses CONFIG_MMU_GATHER_TABLE_FREE when using
> paravirt, and not when running on bare metal.
>
> There is no real good reason to do things differently for
> each setup. Make them all the same.
>
> Currently get_user_pages_fast synchronizes against page table
> freeing in two different ways:
> - on bare metal, by blocking IRQs, which block TLB flush IPIs
> - on paravirt, with MMU_GATHER_RCU_TABLE_FREE

Right, worth noting the latter also right now relies on the blocking of 
IRQs that is in place, because they implicitly block the RCU sync.

Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>

--
Cheers,

David / dhildenb