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x86: move all the pgd_list handling to one place 

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jeremy Fitzhardinge 2008-03-17 16:37:00 -07:00 committed by Ingo Molnar
parent 5a5f8f4224
commit 394158559d
1 changed files with 7 additions and 21 deletions
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28
arch/x86/mm/pgtable.c
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@ -43,34 +43,31 @@ void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
#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 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
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 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd)
* 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)