On Mon, Jun 26, 2017 at 11:43:04AM +0200, Ingo Molnar wrote: > > * [email protected] <[email protected]> wrote: > > > From: Jérôme Glisse <[email protected]> > > > > 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
