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x86: cpa create set_and_clr function 

Create a set_and_clr function to avoid the duplicate loops. Allows
also to do combined operations for optimization.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2008-01-30 13:34:08 +01:00 committed by Ingo Molnar
parent 72932c7ad2
commit ff31452b6e
1 changed files with 39 additions and 0 deletions
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39
arch/x86/mm/pageattr.c
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@ -282,6 +282,45 @@ static int change_page_attr_addr(unsigned long address, pgprot_t prot)
return err;
}
static int __change_page_attr_set_clr(unsigned long addr, int numpages,
pgprot_t mask_set, pgprot_t mask_clr)
{
pgprot_t new_prot;
int level;
pte_t *pte;
int i, ret;
for (i = 0; i < numpages ; i++) {
pte = lookup_address(addr, &level);
if (!pte)
return -EINVAL;
new_prot = pte_pgprot(*pte);
pgprot_val(new_prot) &= ~pgprot_val(mask_clr);
pgprot_val(new_prot) |= pgprot_val(mask_set);
ret = change_page_attr_addr(addr, new_prot);
if (ret)
return ret;
addr += PAGE_SIZE;
}
return 0;
}
static int change_page_attr_set_clr(unsigned long addr, int numpages,
pgprot_t mask_set, pgprot_t mask_clr)
{
int ret = __change_page_attr_set_clr(addr, numpages, mask_set,
mask_clr);
global_flush_tlb();
return ret;
}
/**
* change_page_attr_set - Change page table attributes in the linear mapping.
* @addr: Virtual address in linear mapping.