[PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock

[Linus Torvalds]

On Fri, May 21, 2021 at 3:04 AM Aneesh Kumar K.V
<aneesh.kumar at linux.ibm.com> wrote:
>
> We could do MOVE_PMD with something like below? A equivalent MOVE_PUD
> will be costlier which makes me wonder whether we should even support that?

Well, without USE_SPLIT_PTE_PTLOCKS the pud case would be trivial too.
But everybody uses split pte locks in practice.

I get the feeling that the rmap code might have to use
pud_lock/pmd_lock. I wonder how painful that would be.

             Linus