diff options
| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2012-10-08 16:30:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-09 16:22:29 +0900 |
| commit | 46dcde735c9d8953bbd8d105ca6779e5b5300c28 (patch) | |
| tree | 48298fd35d0ef0091541bad482f06202aba97ad3 | |
| parent | e3ebcf64381188a2744a9829a4eb5c2b60f1974c (diff) | |
| download | lwn-46dcde735c9d8953bbd8d105ca6779e5b5300c28.tar.gz lwn-46dcde735c9d8953bbd8d105ca6779e5b5300c28.zip | |
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@de.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/asm-generic/pgtable.h | 5 | ||||
| -rw-r--r-- | mm/huge_memory.c | 3 | ||||
| -rw-r--r-- | mm/pgtable-generic.c | 11 |
3 files changed, 17 insertions, 2 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 044939f21c16..ebdd74fb8d6a 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -170,6 +170,11 @@ extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable); 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 --git a/mm/huge_memory.c b/mm/huge_memory.c index 9ea6d1953765..bec6243b6965 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1361,8 +1361,7 @@ static int __split_huge_page_map(struct page *page, * 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 --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c index 29867e083d37..e642627da6b7 100644 --- a/mm/pgtable-generic.c +++ b/mm/pgtable-generic.c @@ -159,3 +159,14 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm) } #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 |