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

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Message-Id: <20180627141348.21777-1-toshi.kani@hpe.com>
Date:   Wed, 27 Jun 2018 08:13:45 -0600
From:   Toshi Kani <toshi.kani@....com>
To:     mhocko@...e.com, akpm@...ux-foundation.org, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com
Cc:     cpandya@...eaurora.org, linux-mm@...ck.org, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/3] fix free pmd/pte page handlings on x86

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(-)