From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
change_prot_numa should work even if _PAGE_NUMA != _PAGE_PROTNONE.
On archs like ppc64 that don't use _PAGE_PROTNONE and also have
a separate page table outside linux pagetable, we just need to
make sure that when calling change_prot_numa we flush the
hardware page table entry so that next page access result in a numa
fault.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 3 ---
mm/mempolicy.c | 9 ---------
2 files changed, 12 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8b6e55e..5ab0e22 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1668,11 +1668,8 @@ static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
}
#endif
-#ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
unsigned long change_prot_numa(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
-#endif
-
struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr);
int remap_pfn_range(struct vm_area_struct *, unsigned long addr,
unsigned long pfn, unsigned long size, pgprot_t);
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 0472964..efb4300 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -612,7 +612,6 @@ static inline int queue_pages_pgd_range(struct vm_area_struct *vma,
return 0;
}
-#ifdef CONFIG_ARCH_USES_NUMA_PROT_NONE
/*
* This is used to mark a range of virtual addresses to be inaccessible.
* These are later cleared by a NUMA hinting fault. Depending on these
@@ -626,7 +625,6 @@ unsigned long change_prot_numa(struct vm_area_struct *vma,
unsigned long addr, unsigned long end)
{
int nr_updated;
- BUILD_BUG_ON(_PAGE_NUMA != _PAGE_PROTNONE);
nr_updated = change_protection(vma, addr, end, vma->vm_page_prot, 0, 1);
if (nr_updated)
@@ -634,13 +632,6 @@ unsigned long change_prot_numa(struct vm_area_struct *vma,
return nr_updated;
}
-#else
-static unsigned long change_prot_numa(struct vm_area_struct *vma,
- unsigned long addr, unsigned long end)
-{
- return 0;
-}
-#endif /* CONFIG_ARCH_USES_NUMA_PROT_NONE */
/*
* Walk through page tables and collect pages to be migrated.
--
1.8.3.2
--
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