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    Subjectpage table lock patch V15 [5/7]: x86_64 atomic pte operations
    Changelog
    * Provide atomic pte operations for x86_64

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

    Index: linux-2.6.10/include/asm-x86_64/pgalloc.h
    ===================================================================
    --- linux-2.6.10.orig/include/asm-x86_64/pgalloc.h 2005-01-10 16:31:56.000000000 -0800
    +++ linux-2.6.10/include/asm-x86_64/pgalloc.h 2005-01-10 16:41:24.000000000 -0800
    @@ -7,6 +7,10 @@
    #include <linux/threads.h>
    #include <linux/mm.h>

    +#define PMD_NONE 0
    +#define PUD_NONE 0
    +#define PGD_NONE 0
    +
    #define pmd_populate_kernel(mm, pmd, pte) \
    set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
    #define pud_populate(mm, pud, pmd) \
    @@ -14,9 +18,20 @@
    #define pgd_populate(mm, pgd, pud) \
    set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)))

    +#define pud_test_and_populate(mm, pud, pmd) \
    + (cmpxchg((unsigned long *)pud, PUD_NONE, _PAGE_TABLE | __pa(pmd)) == PUD_NONE)
    +#define pgd_test_and_populate(mm, pgd, pud) \
    + (cmpxchg((unsigned long *)pgd, PGD_NONE, _PAGE_TABLE | __pa(pud)) == PGD_NONE)
    +
    +
    static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
    {
    - set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
    + set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
    +}
    +
    +static inline int pmd_test_and_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
    +{
    + return cmpxchg((unsigned long *)pmd, PMD_NONE, _PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)) == PMD_NONE;
    }

    extern __inline__ pmd_t *get_pmd(void)
    Index: linux-2.6.10/include/asm-x86_64/pgtable.h
    ===================================================================
    --- linux-2.6.10.orig/include/asm-x86_64/pgtable.h 2005-01-10 16:31:56.000000000 -0800
    +++ linux-2.6.10/include/asm-x86_64/pgtable.h 2005-01-10 16:41:24.000000000 -0800
    @@ -414,6 +414,10 @@
    #define kc_offset_to_vaddr(o) \
    (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))

    +
    +#define ptep_cmpxchg(__vma,__addr,__xp,__oldval,__newval) (cmpxchg(&(__xp)->pte, pte_val(__oldval), pte_val(__newval)) == pte_val(__oldval))
    +#define __HAVE_ARCH_ATOMIC_TABLE_OPS
    +
    #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
    #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
    #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
    -
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