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Commit 39415855 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Ingo Molnar
Browse files

x86: move all the pgd_list handling to one place 



Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 5a5f8f42

arch/x86/mm/pgtable.c

+7 −21
Original line number Diff line number Diff line
@@ -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)