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x86: clean up differences between 64-bit and 32-bit 

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2008-01-30 13:34:03 +01:00
parent 6faa4c53b2
commit 674d67269e
1 changed files with 11 additions and 5 deletions
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16
arch/x86/mm/pageattr_64.c
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@ -126,30 +126,36 @@ static int split_large_page(pte_t *kpte, unsigned long address)
static int
__change_page_attr(unsigned long address, struct page *page, pgprot_t prot)
{
pgprot_t ref_prot2, oldprot;
struct page *kpte_page;
int level, err = 0;
pte_t *kpte;
BUG_ON(PageHighMem(page));
repeat:
kpte = lookup_address(address, &level);
if (!kpte)
return 0;
kpte_page = virt_to_page(kpte);
oldprot = pte_pgprot(*kpte);
BUG_ON(PageLRU(kpte_page));
BUG_ON(PageCompound(kpte_page));
prot = canon_pgprot(prot);
/*
* Better fail early if someone sets the kernel text to NX.
* Does not cover __inittext
*/
BUG_ON(address >= (unsigned long)&_text &&
address < (unsigned long)&_etext &&
(pgprot_val(prot) & _PAGE_NX));
if (level == 4) {
set_pte_atomic(kpte, mk_pte(page, prot));
set_pte_atomic(kpte, mk_pte(page, canon_pgprot(prot)));
} else {
err = split_large_page(kpte, address);
if (!err)
goto repeat;
}
return err;
}