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Subject[PATCH 21 of 66] add pmd mmu_notifier helpers
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From: Andrea Arcangeli <aarcange@redhat.com>

Add mmu notifier helpers to handle pmd huge operations.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
---

diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -243,6 +243,32 @@ static inline void mmu_notifier_mm_destr
__pte; \
})

+#define pmdp_clear_flush_notify(__vma, __address, __pmdp) \
+({ \
+ pmd_t __pmd; \
+ struct vm_area_struct *___vma = __vma; \
+ unsigned long ___address = __address; \
+ VM_BUG_ON(__address & ~HPAGE_PMD_MASK); \
+ mmu_notifier_invalidate_range_start(___vma->vm_mm, ___address, \
+ (__address)+HPAGE_PMD_SIZE);\
+ __pmd = pmdp_clear_flush(___vma, ___address, __pmdp); \
+ mmu_notifier_invalidate_range_end(___vma->vm_mm, ___address, \
+ (__address)+HPAGE_PMD_SIZE); \
+ __pmd; \
+})
+
+#define pmdp_splitting_flush_notify(__vma, __address, __pmdp) \
+({ \
+ struct vm_area_struct *___vma = __vma; \
+ unsigned long ___address = __address; \
+ VM_BUG_ON(__address & ~HPAGE_PMD_MASK); \
+ mmu_notifier_invalidate_range_start(___vma->vm_mm, ___address, \
+ (__address)+HPAGE_PMD_SIZE);\
+ pmdp_splitting_flush(___vma, ___address, __pmdp); \
+ mmu_notifier_invalidate_range_end(___vma->vm_mm, ___address, \
+ (__address)+HPAGE_PMD_SIZE); \
+})
+
#define ptep_clear_flush_young_notify(__vma, __address, __ptep) \
({ \
int __young; \
@@ -254,6 +280,17 @@ static inline void mmu_notifier_mm_destr
__young; \
})

+#define pmdp_clear_flush_young_notify(__vma, __address, __pmdp) \
+({ \
+ int __young; \
+ struct vm_area_struct *___vma = __vma; \
+ unsigned long ___address = __address; \
+ __young = pmdp_clear_flush_young(___vma, ___address, __pmdp); \
+ __young |= mmu_notifier_clear_flush_young(___vma->vm_mm, \
+ ___address); \
+ __young; \
+})
+
#define set_pte_at_notify(__mm, __address, __ptep, __pte) \
({ \
struct mm_struct *___mm = __mm; \
@@ -305,7 +342,10 @@ static inline void mmu_notifier_mm_destr
}

#define ptep_clear_flush_young_notify ptep_clear_flush_young
+#define pmdp_clear_flush_young_notify pmdp_clear_flush_young
#define ptep_clear_flush_notify ptep_clear_flush
+#define pmdp_clear_flush_notify pmdp_clear_flush
+#define pmdp_splitting_flush_notify pmdp_splitting_flush
#define set_pte_at_notify set_pte_at

#endif /* CONFIG_MMU_NOTIFIER */

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