Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / s390 / include / asm / hugetlb.h

diff --git a/kernel/arch/s390/include/asm/hugetlb.h b/kernel/arch/s390/include/asm/hugetlb.h
new file mode 100644 (file)
index 0000000..11eae5f
--- /dev/null
+++ b/kernel/arch/s390/include/asm/hugetlb.h
@@ -0,0 +1,115 @@
+/*
+ *  IBM System z Huge TLB Page Support for Kernel.
+ *
+ *    Copyright IBM Corp. 2008
+ *    Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
+ */
+
+#ifndef _ASM_S390_HUGETLB_H
+#define _ASM_S390_HUGETLB_H
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+
+#define is_hugepage_only_range(mm, addr, len)  0
+#define hugetlb_free_pgd_range                 free_pgd_range
+
+void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+                    pte_t *ptep, pte_t pte);
+pte_t huge_ptep_get(pte_t *ptep);
+pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
+                             unsigned long addr, pte_t *ptep);
+
+/*
+ * If the arch doesn't supply something else, assume that hugepage
+ * size aligned regions are ok without further preparation.
+ */
+static inline int prepare_hugepage_range(struct file *file,
+                       unsigned long addr, unsigned long len)
+{
+       if (len & ~HPAGE_MASK)
+               return -EINVAL;
+       if (addr & ~HPAGE_MASK)
+               return -EINVAL;
+       return 0;
+}
+
+#define hugetlb_prefault_arch_hook(mm)         do { } while (0)
+#define arch_clear_hugepage_flags(page)                do { } while (0)
+
+int arch_prepare_hugepage(struct page *page);
+void arch_release_hugepage(struct page *page);
+
+static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
+                                 pte_t *ptep)
+{
+       pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
+}
+
+static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
+                                        unsigned long address, pte_t *ptep)
+{
+       huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
+}
+
+static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
+                                            unsigned long addr, pte_t *ptep,
+                                            pte_t pte, int dirty)
+{
+       int changed = !pte_same(huge_ptep_get(ptep), pte);
+       if (changed) {
+               huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
+               set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
+       }
+       return changed;
+}
+
+static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
+                                          unsigned long addr, pte_t *ptep)
+{
+       pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
+       set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
+}
+
+static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
+{
+       return mk_pte(page, pgprot);
+}
+
+static inline int huge_pte_none(pte_t pte)
+{
+       return pte_none(pte);
+}
+
+static inline int huge_pte_write(pte_t pte)
+{
+       return pte_write(pte);
+}
+
+static inline int huge_pte_dirty(pte_t pte)
+{
+       return pte_dirty(pte);
+}
+
+static inline pte_t huge_pte_mkwrite(pte_t pte)
+{
+       return pte_mkwrite(pte);
+}
+
+static inline pte_t huge_pte_mkdirty(pte_t pte)
+{
+       return pte_mkdirty(pte);
+}
+
+static inline pte_t huge_pte_wrprotect(pte_t pte)
+{
+       return pte_wrprotect(pte);
+}
+
+static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
+{
+       return pte_modify(pte, newprot);
+}
+
+#endif /* _ASM_S390_HUGETLB_H */