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x86: implement gbpages support in change_page_attr()

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Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andi Kleen 2008-02-04 16:48:09 +01:00 committed by Ingo Molnar
parent b536022227
commit f07333fd14
1 changed files with 15 additions and 2 deletions
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17
arch/x86/mm/pageattr.c
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@ -281,7 +281,12 @@ static int try_preserve_large_page(pte_t *kpte, unsigned long address,
psize = PMD_PAGE_SIZE;
pmask = PMD_PAGE_MASK;
break;
#ifdef CONFIG_X86_64
case PG_LEVEL_1G:
psize = PMD_PAGE_SIZE;
pmask = PMD_PAGE_MASK;
break;
#endif
default:
res = -EINVAL;
goto out_unlock;
@ -343,7 +348,7 @@ static int split_large_page(pte_t *kpte, unsigned long address)
{
pgprot_t ref_prot;
gfp_t gfp_flags = GFP_KERNEL;
unsigned long flags, addr, pfn;
unsigned long flags, addr, pfn, pfninc = 1;
pte_t *pbase, *tmp;
struct page *base;
unsigned int i, level;
@ -372,11 +377,19 @@ static int split_large_page(pte_t *kpte, unsigned long address)
#endif
ref_prot = pte_pgprot(pte_clrhuge(*kpte));
#ifdef CONFIG_X86_64
if (level == PG_LEVEL_1G) {
pfninc = PMD_PAGE_SIZE >> PAGE_SHIFT;
pgprot_val(ref_prot) |= _PAGE_PSE;
addr &= PUD_PAGE_MASK;
}
#endif
/*
* Get the target pfn from the original entry:
*/
pfn = pte_pfn(*kpte);
for (i = 0; i < PTRS_PER_PTE; i++, pfn++)
for (i = 0; i < PTRS_PER_PTE; i++, pfn += pfninc)
set_pte(&pbase[i], pfn_pte(pfn, ref_prot));
/*