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Subject[PATCH 5/6] introduce pmd_to_pte_t()
Date
Casting pmd into pte_t to handle thp is strongly architecture dependent.
This patch introduces a new function to separate this dependency from
independent part.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>

Changes since v4:
- Rename thp_ptep_get() to pmd_to_pte_t()
---
arch/x86/include/asm/pgtable.h | 5 +++++
fs/proc/task_mmu.c | 4 ++--
include/asm-generic/pgtable.h | 4 ++++
3 files changed, 11 insertions(+), 2 deletions(-)

diff --git 3.3-rc2.orig/arch/x86/include/asm/pgtable.h 3.3-rc2/arch/x86/include/asm/pgtable.h
index 49afb3f..0058358 100644
--- 3.3-rc2.orig/arch/x86/include/asm/pgtable.h
+++ 3.3-rc2/arch/x86/include/asm/pgtable.h
@@ -165,6 +165,11 @@ static inline int has_transparent_hugepage(void)
{
return cpu_has_pse;
}
+/* Caller must confirm that a given pmd points to a hugepage. */
+static inline pte_t pmd_to_pte_t(pmd_t *pmd)
+{
+ return *(pte_t *)pmd;
+}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
diff --git 3.3-rc2.orig/fs/proc/task_mmu.c 3.3-rc2/fs/proc/task_mmu.c
index 9ff102a..de94384 100644
--- 3.3-rc2.orig/fs/proc/task_mmu.c
+++ 3.3-rc2/fs/proc/task_mmu.c
@@ -395,7 +395,7 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
spinlock_t *ptl;

if (pmd_trans_huge_lock(pmd, vma)) {
- smaps_pte_entry(*(pte_t *)pmd, addr, HPAGE_PMD_SIZE, walk);
+ smaps_pte_entry(pmd_to_pte_t(pmd), addr, HPAGE_PMD_SIZE, walk);
spin_unlock(&walk->mm->page_table_lock);
mss->anonymous_thp += HPAGE_PMD_SIZE;
return 0;
@@ -967,7 +967,7 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
md = walk->private;

if (pmd_trans_huge_lock(pmd, md->vma)) {
- pte_t huge_pte = *(pte_t *)pmd;
+ pte_t huge_pte = pmd_to_pte_t(pmd);
struct page *page;

page = can_gather_numa_stats(huge_pte, md->vma, addr);
diff --git 3.3-rc2.orig/include/asm-generic/pgtable.h 3.3-rc2/include/asm-generic/pgtable.h
index 76bff2b..45160c7 100644
--- 3.3-rc2.orig/include/asm-generic/pgtable.h
+++ 3.3-rc2/include/asm-generic/pgtable.h
@@ -434,6 +434,10 @@ static inline int pmd_trans_splitting(pmd_t pmd)
{
return 0;
}
+static inline pte_t pmd_to_pte_t(pmd_t *pmd)
+{
+ return 0;
+}
#ifndef __HAVE_ARCH_PMD_WRITE
static inline int pmd_write(pmd_t pmd)
{
--
1.7.7.6


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