The patch titled
Subject: thp: introduce pmdp_invalidate()
has been added to the -mm tree. Its filename is
thp-introduce-pmdp_invalidate.patch
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------------------------------------------------------
From: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
Subject: thp: introduce pmdp_invalidate()
On s390, a valid page table entry must not be changed while it is attached
to any CPU. So instead of pmd_mknotpresent() and set_pmd_at(), an IDTE
operation would be necessary there. This patch introduces the
pmdp_invalidate() function, to allow architecture-specific
implementations.
Signed-off-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Hillf Danton <dhillf@xxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-generic/pgtable.h | 5 +++++
mm/huge_memory.c | 3 +--
mm/pgtable-generic.c | 11 +++++++++++
3 files changed, 17 insertions(+), 2 deletions(-)
diff -puN include/asm-generic/pgtable.h~thp-introduce-pmdp_invalidate include/asm-generic/pgtable.h
--- a/include/asm-generic/pgtable.h~thp-introduce-pmdp_invalidate
+++ a/include/asm-generic/pgtable.h
@@ -170,6 +170,11 @@ extern void pgtable_trans_huge_deposit(s
extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm);
#endif
+#ifndef __HAVE_ARCH_PMDP_INVALIDATE
+extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
+ pmd_t *pmdp);
+#endif
+
#ifndef __HAVE_ARCH_PTE_SAME
static inline int pte_same(pte_t pte_a, pte_t pte_b)
{
diff -puN mm/huge_memory.c~thp-introduce-pmdp_invalidate mm/huge_memory.c
--- a/mm/huge_memory.c~thp-introduce-pmdp_invalidate
+++ a/mm/huge_memory.c
@@ -1361,8 +1361,7 @@ static int __split_huge_page_map(struct
* SMP TLB and finally we write the non-huge version
* of the pmd entry with pmd_populate.
*/
- set_pmd_at(mm, address, pmd, pmd_mknotpresent(*pmd));
- flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+ pmdp_invalidate(vma, address, pmd);
pmd_populate(mm, pmd, pgtable);
ret = 1;
}
diff -puN mm/pgtable-generic.c~thp-introduce-pmdp_invalidate mm/pgtable-generic.c
--- a/mm/pgtable-generic.c~thp-introduce-pmdp_invalidate
+++ a/mm/pgtable-generic.c
@@ -159,3 +159,14 @@ pgtable_t pgtable_trans_huge_withdraw(st
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
+
+#ifndef __HAVE_ARCH_PMDP_INVALIDATE
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
+ pmd_t *pmdp)
+{
+ set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
+ flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif
_
Patches currently in -mm which might be from gerald.schaefer@xxxxxxxxxx are
linux-next.patch
thp-x86-introduce-have_arch_transparent_hugepage.patch
thp-remove-assumptions-on-pgtable_t-type.patch
thp-introduce-pmdp_invalidate.patch
thp-make-madv_hugepage-check-for-mm-def_flags.patch
thp-s390-thp-splitting-backend-for-s390.patch
thp-s390-thp-pagetable-pre-allocation-for-s390.patch
thp-s390-disable-thp-for-kvm-host-on-s390.patch
thp-s390-architecture-backend-for-thp-on-s390.patch
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