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    Subjectpage 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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