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Commit ef354af4 authored by venkatesh.pallipadi@intel.com's avatar venkatesh.pallipadi@intel.com Committed by Ingo Molnar
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x86: PAT add set_memory_wc() interface 



Add a set_memory_wc interface(), similar to set_memory_uc interface.
Callers has to call set_memory_uc, set_memory_wb and
set_memory_wc, set_memory_wb as pairs.

Signed-off-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 03d72aa1

arch/x86/mm/pageattr.c

+19 −0
Original line number Diff line number Diff line
@@ -787,6 +787,25 @@ int set_memory_uc(unsigned long addr, int numpages) 
}

EXPORT_SYMBOL(set_memory_uc);



int _set_memory_wc(unsigned long addr, int numpages)

{

	return change_page_attr_set(addr, numpages,

				    __pgprot(_PAGE_CACHE_WC));

}



int set_memory_wc(unsigned long addr, int numpages)

{

	if (!pat_wc_enabled)

		return set_memory_uc(addr, numpages);



	if (reserve_memtype(addr, addr + numpages * PAGE_SIZE,

		_PAGE_CACHE_WC, NULL))

		return -EINVAL;



	return _set_memory_wc(addr, numpages);

}

EXPORT_SYMBOL(set_memory_wc);



int _set_memory_wb(unsigned long addr, int numpages)

{

	return change_page_attr_clear(addr, numpages,

include/asm-x86/cacheflush.h

+2 −0
Original line number Diff line number Diff line
@@ -35,8 +35,10 @@ int set_pages_ro(struct page *page, int numpages); 
int set_pages_rw(struct page *page, int numpages);



int _set_memory_uc(unsigned long addr, int numpages);

int _set_memory_wc(unsigned long addr, int numpages);

int _set_memory_wb(unsigned long addr, int numpages);

int set_memory_uc(unsigned long addr, int numpages);

int set_memory_wc(unsigned long addr, int numpages);

int set_memory_wb(unsigned long addr, int numpages);

int set_memory_x(unsigned long addr, int numpages);

int set_memory_nx(unsigned long addr, int numpages);