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thp, s390: architecture backend for thp on s390

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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>
This commit is contained in:
Gerald Schaefer
2012-10-08 16:30:24 -07:00
committed by Linus Torvalds
parent 274023da1e
commit 1ae1c1d09f
6 changed files with 220 additions and 18 deletions
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22
arch/s390/mm/pgtable.c
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@@ -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 */