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[PATCH] Use proper accessors to change PSE bits in change_page_attr() 

Use normal pte accessors in change_page_attr() to access the PSE
bits.

Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-09-26 10:52:37 +02:00 committed by Andi Kleen
parent df992848f5
commit 5e6b0bfe5b
2 changed files with 7 additions and 10 deletions
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12
arch/x86_64/mm/pageattr.c
View File

@ -108,8 +108,8 @@ static void revert_page(unsigned long address, pgprot_t ref_prot)
BUG_ON(pud_none(*pud));
pmd = pmd_offset(pud, address);
BUG_ON(pmd_val(*pmd) & _PAGE_PSE);
pgprot_val(ref_prot) |= _PAGE_PSE;
large_pte = mk_pte_phys(__pa(address) & LARGE_PAGE_MASK, ref_prot);
large_pte = pte_mkhuge(large_pte);
set_pte((pte_t *)pmd, large_pte);
}
@ -119,24 +119,20 @@ __change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
{
pte_t *kpte;
struct page *kpte_page;
unsigned kpte_flags;
pgprot_t ref_prot2;
kpte = lookup_address(address);
if (!kpte) return 0;
kpte_page = virt_to_page(((unsigned long)kpte) & PAGE_MASK);
kpte_flags = pte_val(*kpte);
if (pgprot_val(prot) != pgprot_val(ref_prot)) {
if ((kpte_flags & _PAGE_PSE) == 0) {
if (!pte_huge(*kpte)) {
set_pte(kpte, pfn_pte(pfn, prot));
} else {
/*
* split_large_page will take the reference for this
* change_page_attr on the split page.
*/
struct page *split;
ref_prot2 = __pgprot(pgprot_val(pte_pgprot(*lookup_address(address))) & ~(1<<_PAGE_BIT_PSE));
ref_prot2 = pte_pgprot(pte_clrhuge(*kpte));
split = split_large_page(address, prot, ref_prot2);
if (!split)
return -ENOMEM;
@ -144,7 +140,7 @@ __change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
kpte_page = split;
}
page_private(kpte_page)++;
} else if ((kpte_flags & _PAGE_PSE) == 0) {
} else if (!pte_huge(*kpte)) {
set_pte(kpte, pfn_pte(pfn, ref_prot));
BUG_ON(page_private(kpte_page) == 0);
page_private(kpte_page)--;

1
include/asm-x86_64/pgtable.h
View File

@ -283,6 +283,7 @@ static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) |
static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
static inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_PSE)); return pte; }
static inline pte_t pte_clrhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_PSE)); return pte; }
struct vm_area_struct;