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Commit 56744546 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar
Browse files

x86: cpa use the new set_clr function 



Convert cpa_set and cpa_clear to call the new set_clr function.
Seperate out the debug helpers.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent ff31452b

arch/x86/mm/pageattr.c

+20 −106
Original line number Diff line number Diff line
@@ -321,116 +321,16 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages, 
	return ret;

}



/**

 * change_page_attr_set - Change page table attributes in the linear mapping.

 * @addr: Virtual address in linear mapping.

 * @numpages: Number of pages to change

 * @prot: Protection/caching type bits to set (PAGE_*)

 *

 * Returns 0 on success, otherwise a negated errno.

 *

 * This should be used when a page is mapped with a different caching policy

 * than write-back somewhere - some CPUs do not like it when mappings with

 * different caching policies exist. This changes the page attributes of the

 * in kernel linear mapping too.

 *

 * The caller needs to ensure that there are no conflicting mappings elsewhere

 * (e.g. in user space) * This function only deals with the kernel linear map.

 *

 * This function is different from change_page_attr() in that only selected bits

 * are impacted, all other bits remain as is.

 */

static int __change_page_attr_set(unsigned long addr, int numpages,

				  pgprot_t prot)

{

	pgprot_t current_prot, 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;



		current_prot = pte_pgprot(*pte);



		pgprot_val(new_prot) =

			pgprot_val(current_prot) | pgprot_val(prot);



		ret = change_page_attr_addr(addr, new_prot);

		if (ret)

			return ret;

		addr += PAGE_SIZE;

	}



	return 0;

}



static int change_page_attr_set(unsigned long addr, int numpages, pgprot_t prot)

{

	int ret = __change_page_attr_set(addr, numpages, prot);



	global_flush_tlb();

	return ret;



}



/**

 * change_page_attr_clear - Change page table attributes in the linear mapping.

 * @addr: Virtual address in linear mapping.

 * @numpages: Number of pages to change

 * @prot: Protection/caching type bits to clear (PAGE_*)

 *

 * Returns 0 on success, otherwise a negated errno.

 *

 * This should be used when a page is mapped with a different caching policy

 * than write-back somewhere - some CPUs do not like it when mappings with

 * different caching policies exist. This changes the page attributes of the

 * in kernel linear mapping too.

 *

 * The caller needs to ensure that there are no conflicting mappings elsewhere

 * (e.g. in user space) * This function only deals with the kernel linear map.

 *

 * This function is different from change_page_attr() in that only selected bits

 * are impacted, all other bits remain as is.

 */

static int __change_page_attr_clear(unsigned long addr, int numpages,

				    pgprot_t prot)

static inline int change_page_attr_set(unsigned long addr, int numpages,

				       pgprot_t mask)

{

	pgprot_t current_prot, 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;



		current_prot = pte_pgprot(*pte);



		pgprot_val(new_prot) =

				pgprot_val(current_prot) & ~pgprot_val(prot);



		ret = change_page_attr_addr(addr, new_prot);

		if (ret)

			return ret;

		addr += PAGE_SIZE;

	return change_page_attr_set_clr(addr, numpages, mask, __pgprot(0));

}



	return 0;

}



static int change_page_attr_clear(unsigned long addr, int numpages,

				  pgprot_t prot)

static inline int change_page_attr_clear(unsigned long addr, int numpages,

					 pgprot_t mask)

{

	int ret = __change_page_attr_clear(addr, numpages, prot);



	global_flush_tlb();

	return ret;

	return __change_page_attr_set_clr(addr, numpages, __pgprot(0), mask);



}
@@ -522,6 +422,20 @@ int set_pages_rw(struct page *page, int numpages) 
}





#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_CPA_DEBUG)

static inline int __change_page_attr_set(unsigned long addr, int numpages,

					 pgprot_t mask)

{

	return __change_page_attr_set_clr(addr, numpages, mask, __pgprot(0));

}



static inline int __change_page_attr_clear(unsigned long addr, int numpages,

					   pgprot_t mask)

{

	return __change_page_attr_set_clr(addr, numpages, __pgprot(0), mask);

}

#endif



#ifdef CONFIG_DEBUG_PAGEALLOC



static int __set_pages_p(struct page *page, int numpages)