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x86: clean up and simplify 64-bit split_large_page()

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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 13:34:00 +01:00
parent 5e5224a77e
commit a5c6251488
1 changed files with 7 additions and 7 deletions
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14
arch/x86/mm/pageattr_64.c
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@ -46,7 +46,7 @@ pte_t *lookup_address(unsigned long address, int *level)
}
static struct page *
split_large_page(unsigned long address, pgprot_t prot, pgprot_t ref_prot)
split_large_page(unsigned long address, pgprot_t ref_prot)
{
unsigned long addr;
struct page *base;
@ -60,10 +60,9 @@ split_large_page(unsigned long address, pgprot_t prot, pgprot_t ref_prot)
address = __pa(address);
addr = address & LARGE_PAGE_MASK;
pbase = (pte_t *)page_address(base);
for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE) {
pbase[i] = pfn_pte(addr >> PAGE_SHIFT,
addr == address ? prot : ref_prot);
}
for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE)
pbase[i] = pfn_pte(addr >> PAGE_SHIFT, ref_prot);
return base;
}
@ -76,6 +75,7 @@ __change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
pgprot_t ref_prot2, oldprot;
int level;
repeat:
kpte = lookup_address(address, &level);
if (!kpte)
return 0;
@ -98,12 +98,12 @@ __change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
struct page *split;
ref_prot2 = pte_pgprot(pte_clrhuge(*kpte));
split = split_large_page(address, prot, ref_prot2);
split = split_large_page(address, ref_prot2);
if (!split)
return -ENOMEM;
pgprot_val(ref_prot2) &= ~_PAGE_NX;
set_pte(kpte, mk_pte(split, ref_prot2));
kpte_page = split;
goto repeat;
}
} else {
if (level == 4) {