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Subject[PATCH 17 of 66] add pmd mangling generic functions
Date
From
From: Andrea Arcangeli <aarcange@redhat.com>

Some are needed to build but not actually used on archs not supporting
transparent hugepages. Others like pmdp_clear_flush are used by x86 too.

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

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -25,6 +25,26 @@
})
#endif

+#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#define pmdp_set_access_flags(__vma, __address, __pmdp, __entry, __dirty) \
+ ({ \
+ int __changed = !pmd_same(*(__pmdp), __entry); \
+ VM_BUG_ON((__address) & ~HPAGE_PMD_MASK); \
+ if (__changed) { \
+ set_pmd_at((__vma)->vm_mm, __address, __pmdp, \
+ __entry); \
+ flush_tlb_range(__vma, __address, \
+ (__address) + HPAGE_PMD_SIZE); \
+ } \
+ __changed; \
+ })
+#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+#define pmdp_set_access_flags(__vma, __address, __pmdp, __entry, __dirty) \
+ ({ BUG(); 0; })
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif
+
#ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define ptep_test_and_clear_young(__vma, __address, __ptep) \
({ \
@@ -39,6 +59,25 @@
})
#endif

+#ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#define pmdp_test_and_clear_young(__vma, __address, __pmdp) \
+({ \
+ pmd_t __pmd = *(__pmdp); \
+ int r = 1; \
+ if (!pmd_young(__pmd)) \
+ r = 0; \
+ else \
+ set_pmd_at((__vma)->vm_mm, (__address), \
+ (__pmdp), pmd_mkold(__pmd)); \
+ r; \
+})
+#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+#define pmdp_test_and_clear_young(__vma, __address, __pmdp) \
+ ({ BUG(); 0; })
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif
+
#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
#define ptep_clear_flush_young(__vma, __address, __ptep) \
({ \
@@ -50,6 +89,24 @@
})
#endif

+#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#define pmdp_clear_flush_young(__vma, __address, __pmdp) \
+({ \
+ int __young; \
+ VM_BUG_ON((__address) & ~HPAGE_PMD_MASK); \
+ __young = pmdp_test_and_clear_young(__vma, __address, __pmdp); \
+ if (__young) \
+ flush_tlb_range(__vma, __address, \
+ (__address) + HPAGE_PMD_SIZE); \
+ __young; \
+})
+#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+#define pmdp_clear_flush_young(__vma, __address, __pmdp) \
+ ({ BUG(); 0; })
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif
+
#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
#define ptep_get_and_clear(__mm, __address, __ptep) \
({ \
@@ -59,6 +116,20 @@
})
#endif

+#ifndef __HAVE_ARCH_PMDP_GET_AND_CLEAR
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#define pmdp_get_and_clear(__mm, __address, __pmdp) \
+({ \
+ pmd_t __pmd = *(__pmdp); \
+ pmd_clear((__mm), (__address), (__pmdp)); \
+ __pmd; \
+})
+#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+#define pmdp_get_and_clear(__mm, __address, __pmdp) \
+ ({ BUG(); 0; })
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif
+
#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
#define ptep_get_and_clear_full(__mm, __address, __ptep, __full) \
({ \
@@ -90,6 +161,22 @@ do { \
})
#endif

+#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#define pmdp_clear_flush(__vma, __address, __pmdp) \
+({ \
+ pmd_t __pmd; \
+ VM_BUG_ON((__address) & ~HPAGE_PMD_MASK); \
+ __pmd = pmdp_get_and_clear((__vma)->vm_mm, __address, __pmdp); \
+ flush_tlb_range(__vma, __address, (__address) + HPAGE_PMD_SIZE);\
+ __pmd; \
+})
+#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+#define pmdp_clear_flush(__vma, __address, __pmdp) \
+ ({ BUG(); 0; })
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif
+
#ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
struct mm_struct;
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
@@ -99,10 +186,45 @@ static inline void ptep_set_wrprotect(st
}
#endif

+#ifndef __HAVE_ARCH_PMDP_SET_WRPROTECT
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+static inline void pmdp_set_wrprotect(struct mm_struct *mm, unsigned long address, pmd_t *pmdp)
+{
+ pmd_t old_pmd = *pmdp;
+ set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd));
+}
+#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+#define pmdp_set_wrprotect(mm, address, pmdp) BUG()
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif
+
+#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#define pmdp_splitting_flush(__vma, __address, __pmdp) \
+({ \
+ pmd_t __pmd = pmd_mksplitting(*(__pmdp)); \
+ VM_BUG_ON((__address) & ~HPAGE_PMD_MASK); \
+ set_pmd_at((__vma)->vm_mm, __address, __pmdp, __pmd); \
+ /* tlb flush only to serialize against gup-fast */ \
+ flush_tlb_range(__vma, __address, (__address) + HPAGE_PMD_SIZE);\
+})
+#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+#define pmdp_splitting_flush(__vma, __address, __pmdp) BUG()
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif
+
#ifndef __HAVE_ARCH_PTE_SAME
#define pte_same(A,B) (pte_val(A) == pte_val(B))
#endif

+#ifndef __HAVE_ARCH_PMD_SAME
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+#define pmd_same(A,B) (pmd_val(A) == pmd_val(B))
+#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+#define pmd_same(A,B) ({ BUG(); 0; })
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif
+
#ifndef __HAVE_ARCH_PAGE_TEST_DIRTY
#define page_test_dirty(page) (0)
#endif
@@ -351,6 +473,9 @@ extern void untrack_pfn_vma(struct vm_ar
#ifndef CONFIG_TRANSPARENT_HUGEPAGE
#define pmd_trans_huge(pmd) 0
#define pmd_trans_splitting(pmd) 0
+#ifndef __HAVE_ARCH_PMD_WRITE
+#define pmd_write(pmd) ({ BUG(); 0; })
+#endif /* __HAVE_ARCH_PMD_WRITE */
#endif

#endif /* !__ASSEMBLY__ */

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