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| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2012-10-09 03:30:24 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-09 11:22:31 +0400 |
| commit | 1ae1c1d09f220ded48ee9a7d91a65e94f95c4af1 (patch) | |
| tree | 3c6e53c880a946dccb33b81116ca048800b28214 /arch/s390/mm | |
| parent | 274023da1e8a49efa6fd9bf857f8557e5db44cdf (diff) | |
| download | linux-1ae1c1d09f220ded48ee9a7d91a65e94f95c4af1.tar.xz | |
thp, s390: architecture backend for thp on s390
This implements the architecture backend for transparent hugepages
on s390.
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 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/pgtable.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index e86a523875eb..c8188a18af05 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -898,6 +898,28 @@ bool kernel_page_present(struct page *page) #endif /* CONFIG_HIBERNATION && CONFIG_DEBUG_PAGEALLOC */ #ifdef CONFIG_TRANSPARENT_HUGEPAGE +int pmdp_clear_flush_young(struct vm_area_struct *vma, unsigned long address, + pmd_t *pmdp) +{ + VM_BUG_ON(address & ~HPAGE_PMD_MASK); + /* No need to flush TLB + * On s390 reference bits are in storage key and never in TLB */ + return pmdp_test_and_clear_young(vma, address, pmdp); +} + +int pmdp_set_access_flags(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp, + pmd_t entry, int dirty) +{ + VM_BUG_ON(address & ~HPAGE_PMD_MASK); + + if (pmd_same(*pmdp, entry)) + return 0; + pmdp_invalidate(vma, address, pmdp); + set_pmd_at(vma->vm_mm, address, pmdp, entry); + return 1; +} + static void pmdp_splitting_flush_sync(void *arg) { /* Simply deliver the interrupt */ |