Commit ff31452b authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar

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: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 72932c7a
......@@ -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.
......
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