linux-kernel - [PATCH v2 0/4] x86, mm: Handle large PAT bit in pud/pmd interfaces

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Date:	Wed, 15 Jul 2015 10:23:51 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com
Cc:	akpm@...ux-foundation.org, bp@...en8.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, x86@...nel.org, jgross@...e.com,
	konrad.wilk@...cle.com, elliott@...com
Subject: [PATCH v2 0/4] x86, mm: Handle large PAT bit in pud/pmd interfaces

The PAT bit gets relocated to bit 12 when PUD and PMD mappings are used.
This bit 12, however, is not covered by PTE_FLAGS_MASK, which is corrently
used for masking pfn and flags for all cases.

Patch 1/4-2/4 make changes necessary for patch 3/4 to use P?D_PAGE_MASK.

Patch 3/4 fixes pud/pmd interfaces to handle the PAT bit when PUD and PMD
mappings are used.

Patch 3/4 fixes /sys/kernel/debug/kernel_page_tables to show the PAT bit
properly.

Note, the PAT bit is first enabled in 4.2-rc1 with WT mappings.

---
v2:
 - Change p?n_pfn() to handle the PAT bit. (Juergen Gross)
 - Mask pfn and flags with P?D_PAGE_MASK. (Juergen Gross)
 - Change p?d_page_vaddr() and p?d_page() to handle the PAT bit.

---
Toshi Kani (4):
  1/4 x86/vdso32: Define PGTABLE_LEVELS to 32bit VDSO
  2/4 x86, asm: Move PUD_PAGE macros to page_types.h
  3/4 x86: Fix pud/pmd interfaces to handle large PAT bit
  4/4 x86, mm: Fix page table dump to show PAT bit

---
4fa1ff9a08c...dd58e3d52618b00dd768de1753c35611906fcbee --stat
 arch/x86/entry/vdso/vdso32/vclock_gettime.c |  2 ++
 arch/x86/include/asm/page_64_types.h        |  3 ---
 arch/x86/include/asm/page_types.h           |  3 +++
 arch/x86/include/asm/pgtable.h              | 14 +++++-----
 arch/x86/include/asm/pgtable_types.h        | 40 ++++++++++++++++++++++++++---
 arch/x86/mm/dump_pagetables.c               | 39 +++++++++++++++-------------
 6 files changed, 70 insertions(+), 31 deletions(-)
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