[PATCH v4 0/3] fix free pmd/pte page handlings on x86

[Toshi Kani]

This series fixes two issues in the x86 ioremap free page handlings
for pud/pmd mappings.

Patch 01 fixes BUG_ON on x86-PAE reported by Joerg.  It disables
the free page handling on x86-PAE.

Patch 02-03 fixes a possible issue with speculation which can cause
stale page-directory cache.
 - Patch 02 is from Chintan's v9 01/04 patch [1], which adds a new arg
   'addr', with my merge change to patch 01.
 - Patch 03 adds a TLB purge (INVLPG) to purge page-structure caches
   that may be cached by speculation.  See the patch descriptions for
   more detal.

The patches are based off from the tip tree.

[1] https://patchwork.kernel.org/patch/10371015/

v4:
 - Re-wrote patch 2/3 description. (v3-UPDATE)
 - Added NOTE to pud_free_pmd_page().

v3:
 - Fixed a build error in v2.

v2:
 - Reordered patch-set, so that patch 01 can be applied independently.
 - Added a NULL pointer check for the page alloc in patch 03. 

---
Toshi Kani (2):
  1/3 x86/mm: disable ioremap free page handling on x86-PAE
  3/3 x86/mm: add TLB purge to free pmd/pte page interfaces

Chintan Pandya (1):
  2/3 ioremap: Update pgtable free interfaces with addr

---
 arch/arm64/mm/mmu.c           |  4 +--
 arch/x86/mm/pgtable.c         | 61 +++++++++++++++++++++++++++++++++++++------
 include/asm-generic/pgtable.h |  8 +++---
 lib/ioremap.c                 |  4 +--
 4 files changed, 61 insertions(+), 16 deletions(-)