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 /mm/pgtable-generic.c | |
| 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>
Diffstat (limited to 'mm/pgtable-generic.c')
| -rw-r--r-- | mm/pgtable-generic.c | 11 |
1 files changed, 11 insertions, 0 deletions
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 |