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    Subjectpage fault scalability patch V10: [7/7] s/390 atomic pte operations
    Changelog
    * Provide atomic pte operations for s390

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

    Index: linux-2.6.9-rc4/include/asm-s390/pgtable.h
    ===================================================================
    --- linux-2.6.9-rc4.orig/include/asm-s390/pgtable.h 2004-10-10 19:58:24.000000000 -0700
    +++ linux-2.6.9-rc4/include/asm-s390/pgtable.h 2004-10-14 12:22:14.000000000 -0700
    @@ -567,6 +567,17 @@
    return pte;
    }

    +#define ptep_xchg_flush(__vma, __address, __ptep, __pteval) \
    +({ \
    + struct mm_struct *__mm = __vma->vm_mm; \
    + pte_t __pte; \
    + spin_lock(&__mm->page_table_lock); \
    + __pte = ptep_clear_flush(__vma, __address, __ptep); \
    + set_pte(__ptep, __pteval); \
    + spin_unlock(&__mm->page_table_lock); \
    + __pte; \
    +})
    +
    static inline void ptep_set_wrprotect(pte_t *ptep)
    {
    pte_t old_pte = *ptep;
    @@ -778,6 +789,19 @@

    #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
    */
    @@ -791,6 +815,7 @@
    #define __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH
    #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
    #define __HAVE_ARCH_PTEP_CLEAR_FLUSH
    +#define __HAVE_ARCH_PTEP_XCHG_FLUSH
    #define __HAVE_ARCH_PTEP_SET_WRPROTECT
    #define __HAVE_ARCH_PTEP_MKDIRTY
    #define __HAVE_ARCH_PTE_SAME
    Index: linux-2.6.9-rc4/include/asm-s390/pgalloc.h
    ===================================================================
    --- linux-2.6.9-rc4.orig/include/asm-s390/pgalloc.h 2004-10-10 19:58:06.000000000 -0700
    +++ linux-2.6.9-rc4/include/asm-s390/pgalloc.h 2004-10-14 12:22:14.000000000 -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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