Re: [PATCH] mm/page_table_check: fix accessing unmapped ptep

[Pasha Tatashin]

> > Miaohe, please store the ptep, or maybe drop this patch entirely.
>
> I think it's best to fix it.  I rewrote the changelog as
>
> : ptep is unmapped too early, so ptep could theoretically be accessed while
> : it's unmapped.  This might become a problem if/when CONFIG_HIGHPTE becomes
> : available on riscv.
> :
> : Fix it by deferring pte_unmap() until page table checking is done.
>
> I'll retain the Fixes:.  This doesn't imply cc:stable in MM, and anyone
> who backports the original patchset will want to know about this fixup.
Makes sense.


> And I queued a fixup for the thing Matthew noticed.
Thank you Andrew.

Pasha