page fault scalability patch V8: [7/7] atomic pte operations for s390

Changelog
	* Provide atomic pte operations for s390

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linus/include/asm-s390/pgtable.h
===================================================================
--- linus.orig/include/asm-s390/pgtable.h	2004-09-18 14:25:23.000000000 -0700
+++ linus/include/asm-s390/pgtable.h	2004-09-18 14:47:30.000000000 -0700
@@ -783,6 +783,19 @@

 #define kern_addr_valid(addr)   (1)

+/* Atomic PTE operations */
+#define __HAVE_ARCH_ATOMIC_TABLE_OPS
+
+static inline pte_t ptep_xchg(struct mm_struct *mm, unsigned long address, pte_t *ptep, pte_t pteval)
+{
+	return __pte(xchg(ptep, pte_val(pteval)));
+}
+
+static inline int ptep_cmpxchg (struct mm_struct *mm, unsigned long address, pte_t *ptep, pte_t oldval, pte_t newval)
+{
+	return cmpxchg(ptep, pte_val(oldval), pte_val(newval)) == pte_val(oldval);
+}
+
 /*
  * No page table caches to initialise
  */
Index: linus/include/asm-s390/pgalloc.h
===================================================================
--- linus.orig/include/asm-s390/pgalloc.h	2004-09-18 14:25:23.000000000 -0700
+++ linus/include/asm-s390/pgalloc.h	2004-09-18 14:47:30.000000000 -0700
@@ -97,6 +97,10 @@
 	pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
 }

+static inline int pgd_test_and_populate(struct mm_struct *mm, pdg_t *pgd, pmd_t *pmd)
+{
+	return cmpxchg(pgd, _PAGE_TABLE_INV, _PGD_ENTRY | __pa(pmd)) == _PAGE_TABLE_INV;
+}
 #endif /* __s390x__ */

 static inline void
@@ -119,6 +123,18 @@
 	pmd_populate_kernel(mm, pmd, (pte_t *)((page-mem_map) << PAGE_SHIFT));
 }

+static inline int
+pmd_test_and_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
+{
+	int rc;
+	spin_lock(&mm->page_table_lock);
+
+	rc=pte_same(*pmd, _PAGE_INVALID_EMPTY);
+	if (rc) pmd_populate(mm, pmd, page);
+	spin_unlock(&mm->page_table_lock);
+	return rc;
+}
+
 /*
  * page table entry allocation/free routines.
  */

-
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