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Subject[patch 11/13] 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: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>

Index: linux-2.6-x86.git/arch/x86/mm/pageattr.c
===================================================================
--- linux-2.6-x86.git.orig/arch/x86/mm/pageattr.c 2008-03-18 03:23:49.000000000 -0700
+++ linux-2.6-x86.git/arch/x86/mm/pageattr.c 2008-03-18 03:53:45.000000000 -0700
@@ -788,6 +788,25 @@
}
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,
Index: linux-2.6-x86.git/include/asm-x86/cacheflush.h
===================================================================
--- linux-2.6-x86.git.orig/include/asm-x86/cacheflush.h 2008-03-18 03:21:25.000000000 -0700
+++ linux-2.6-x86.git/include/asm-x86/cacheflush.h 2008-03-18 03:53:45.000000000 -0700
@@ -35,8 +35,10 @@
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);
--


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