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x86: cpa, use page pool 

Switch the split page code to use the page pool. We do this
unconditionally to avoid different behaviour with and without
DEBUG_PAGEALLOC enabled.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2008-02-09 23:24:09 +01:00
parent 76ebd0548d
commit eb5b5f024c
1 changed files with 26 additions and 11 deletions
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37
arch/x86/mm/pageattr.c
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@ -411,20 +411,29 @@ void __init cpa_init(void)
static int split_large_page(pte_t *kpte, unsigned long address)
{
unsigned long flags, pfn, pfninc = 1;
gfp_t gfp_flags = GFP_KERNEL;
unsigned int i, level;
pte_t *pbase, *tmp;
pgprot_t ref_prot;
struct page *base;
#ifdef CONFIG_DEBUG_PAGEALLOC
gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
#endif
base = alloc_pages(gfp_flags, 0);
if (!base)
return -ENOMEM;
/*
* Get a page from the pool. The pool list is protected by the
* pgd_lock, which we have to take anyway for the split
* operation:
*/
spin_lock_irqsave(&pgd_lock, flags);
if (list_empty(&page_pool)) {
spin_unlock_irqrestore(&pgd_lock, flags);
return -ENOMEM;
}
base = list_first_entry(&page_pool, struct page, lru);
list_del(&base->lru);
pool_pages--;
if (pool_pages < pool_low)
pool_low = pool_pages;
/*
* Check for races, another CPU might have split this page
* up for us already:
@ -469,11 +478,17 @@ static int split_large_page(pte_t *kpte, unsigned long address)
base = NULL;
out_unlock:
/*
* If we dropped out via the lookup_address check under
* pgd_lock then stick the page back into the pool:
*/
if (base) {
list_add(&base->lru, &page_pool);
pool_pages++;
} else
pool_used++;
spin_unlock_irqrestore(&pgd_lock, flags);
if (base)
__free_pages(base, 0);
return 0;
}