On Mon, Jun 26, 2017 at 11:43:04AM +0200, Ingo Molnar wrote:
>
> * jglisse@xxxxxxxxxx <jglisse@xxxxxxxxxx> wrote:
>
> > From: Jérôme Glisse <jglisse@xxxxxxxxxx>
> >
> > With commit af2cf278ef4f we no longer free pud so that we do not
> > have synchronize all pgd on hotremove/vfree. But the new 5 level
> > page table patchset reverted that for 4 level page table.
> >
> > This patch restore af2cf278ef4f and disable free_pud() if we are
> > in the 4 level page table case thus avoiding BUG_ON() after hot-
> > remove.
> >
> > af2cf278ef4f x86/mm/hotplug: Don't remove PGD entries in remove_pagetable()
>
> Am I correct that the _real_ buggy commit that introduced the breakage in v4.12
> is:
>
> f2a6a7050109: ("x86: Convert the rest of the code to support p4d_t")
>
> ... right?
Correct.
Jérôme
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