From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Archs like ppc64 have different layout for pmd entries pointing to PTE
page. Hence add a separate function for modifying them
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
---
arch/powerpc/include/asm/pgtable.h | 17 +++++++++++++++++
include/asm-generic/pgtable.h | 20 ++++++++++++++++++++
mm/memory.c | 2 +-
mm/mprotect.c | 24 ++++++------------------
4 files changed, 44 insertions(+), 19 deletions(-)
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 9d87125..67ea8fb 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -75,6 +75,23 @@ static inline pte_t pte_mknuma(pte_t pte)
return pte;
}
+#define change_pmd_protnuma change_pmd_protnuma
+static inline void change_pmd_protnuma(struct mm_struct *mm, unsigned long addr,
+ pmd_t *pmdp, int prot_numa)
+{
+ /*
+ * We don't track the _PAGE_PRESENT bit here
+ */
+ unsigned long pmd_val;
+ pmd_val = pmd_val(*pmdp);
+ if (prot_numa)
+ pmd_val |= _PAGE_NUMA;
+ else
+ pmd_val &= ~_PAGE_NUMA;
+ pmd_set(pmdp, pmd_val | _PAGE_NUMA);
+}
+
+
#define pmd_numa pmd_numa
static inline int pmd_numa(pmd_t pmd)
{
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index f330d28..568a8c4 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -697,6 +697,18 @@ static inline pmd_t pmd_mknuma(pmd_t pmd)
return pmd_clear_flags(pmd, _PAGE_PRESENT);
}
#endif
+
+#ifndef change_pmd_protnuma
+static inline void change_pmd_protnuma(struct mm_struct *mm, unsigned long addr,
+ pmd_t *pmd, int prot_numa)
+{
+ if (prot_numa)
+ set_pmd_at(mm, addr & PMD_MASK, pmd, pmd_mknuma(*pmd));
+ else
+ set_pmd_at(mm, addr & PMD_MASK, pmd, pmd_mknonnuma(*pmd));
+}
+
+#endif
#else
extern int pte_numa(pte_t pte);
extern int pmd_numa(pmd_t pmd);
@@ -704,6 +716,8 @@ extern pte_t pte_mknonnuma(pte_t pte);
extern pmd_t pmd_mknonnuma(pmd_t pmd);
extern pte_t pte_mknuma(pte_t pte);
extern pmd_t pmd_mknuma(pmd_t pmd);
+extern void change_pmd_protnuma(struct mm_struct *mm, unsigned long addr,
+ pmd_t *pmd, int prot_numa);
#endif /* CONFIG_ARCH_USES_NUMA_PROT_NONE */
#else
static inline int pmd_numa(pmd_t pmd)
@@ -735,6 +749,12 @@ static inline pmd_t pmd_mknuma(pmd_t pmd)
{
return pmd;
}
+
+static inline void change_pmd_protnuma(struct mm_struct *mm, unsigned long addr,
+ pmd_t *pmd, int prot_numa)
+{
+ BUG();
+}
#endif /* CONFIG_NUMA_BALANCING */
#endif /* CONFIG_MMU */
diff --git a/mm/memory.c b/mm/memory.c
index ca00039..e930e50 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3605,7 +3605,7 @@ static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
spin_lock(&mm->page_table_lock);
pmd = *pmdp;
if (pmd_numa(pmd)) {
- set_pmd_at(mm, _addr, pmdp, pmd_mknonnuma(pmd));
+ change_pmd_protnuma(mm, _addr, pmdp, 0);
numa = true;
}
spin_unlock(&mm->page_table_lock);
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 94722a4..88de575 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -112,22 +112,6 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
return pages;
}
-#ifdef CONFIG_NUMA_BALANCING
-static inline void change_pmd_protnuma(struct mm_struct *mm, unsigned long addr,
- pmd_t *pmd)
-{
- spin_lock(&mm->page_table_lock);
- set_pmd_at(mm, addr & PMD_MASK, pmd, pmd_mknuma(*pmd));
- spin_unlock(&mm->page_table_lock);
-}
-#else
-static inline void change_pmd_protnuma(struct mm_struct *mm, unsigned long addr,
- pmd_t *pmd)
-{
- BUG();
-}
-#endif /* CONFIG_NUMA_BALANCING */
-
static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
pud_t *pud, unsigned long addr, unsigned long end,
pgprot_t newprot, int dirty_accountable, int prot_numa)
@@ -161,8 +145,12 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
* node. This allows a regular PMD to be handled as one fault
* and effectively batches the taking of the PTL
*/
- if (prot_numa && all_same_node)
- change_pmd_protnuma(vma->vm_mm, addr, pmd);
+ if (prot_numa && all_same_node) {
+ spin_lock(&vma->vm_mm->page_table_lock);
+ change_pmd_protnuma(vma->vm_mm, addr, pmd, 1);
+ spin_unlock(&vma->vm_mm->page_table_lock);
+
+ }
} while (pmd++, addr = next, addr != end);
return pages;
--
1.8.3.2
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