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

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

arch/x86/mm/pageattr.c

+39 −0
Original line number Diff line number Diff line
@@ -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.