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    Subject[PATCH 09 of 31] x86: move all the pgd_list handling to one place
    Date
    From
    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    ---
    arch/x86/mm/pgtable.c | 28 +++++++---------------------
    1 file changed, 7 insertions(+), 21 deletions(-)

    diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
    --- a/arch/x86/mm/pgtable.c
    +++ b/arch/x86/mm/pgtable.c
    @@ -43,34 +43,31 @@
    #endif /* PAGETABLE_LEVELS > 3 */
    #endif /* PAGETABLE_LEVELS > 2 */

    -#ifdef CONFIG_X86_64
    static inline void pgd_list_add(pgd_t *pgd)
    {
    struct page *page = virt_to_page(pgd);
    - unsigned long flags;

    - spin_lock_irqsave(&pgd_lock, flags);
    list_add(&page->lru, &pgd_list);
    - spin_unlock_irqrestore(&pgd_lock, flags);
    }

    static inline void pgd_list_del(pgd_t *pgd)
    {
    struct page *page = virt_to_page(pgd);
    - unsigned long flags;

    - spin_lock_irqsave(&pgd_lock, flags);
    list_del(&page->lru);
    - spin_unlock_irqrestore(&pgd_lock, flags);
    }

    +#ifdef CONFIG_X86_64
    pgd_t *pgd_alloc(struct mm_struct *mm)
    {
    unsigned boundary;
    pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
    + unsigned long flags;
    if (!pgd)
    return NULL;
    + spin_lock_irqsave(&pgd_lock, flags);
    pgd_list_add(pgd);
    + spin_unlock_irqrestore(&pgd_lock, flags);
    /*
    * Copy kernel pointers in from init.
    * Could keep a freelist or slab cache of those because the kernel
    @@ -86,8 +83,11 @@

    void pgd_free(struct mm_struct *mm, pgd_t *pgd)
    {
    + unsigned long flags;
    BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
    + spin_lock_irqsave(&pgd_lock, flags);
    pgd_list_del(pgd);
    + spin_unlock_irqrestore(&pgd_lock, flags);
    free_page((unsigned long)pgd);
    }
    #else
    @@ -101,20 +101,6 @@
    * vmalloc faults work because attached pagetables are never freed.
    * -- wli
    */
    -static inline void pgd_list_add(pgd_t *pgd)
    -{
    - struct page *page = virt_to_page(pgd);
    -
    - list_add(&page->lru, &pgd_list);
    -}
    -
    -static inline void pgd_list_del(pgd_t *pgd)
    -{
    - struct page *page = virt_to_page(pgd);
    -
    - list_del(&page->lru);
    -}
    -
    #define UNSHARED_PTRS_PER_PGD \
    (SHARED_KERNEL_PMD ? USER_PTRS_PER_PGD : PTRS_PER_PGD)




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