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authorvenkatesh.pallipadi@intel.com <venkatesh.pallipadi@intel.com>2008-03-18 17:00:23 -0700
committerIngo Molnar <mingo@elte.hu>2008-04-17 17:41:20 +0200
commitef354af4629e5cc76a3f64fc46d452f2b56d5a59 (patch)
tree679003181a4bc8cd65d90da1351929f7a2db8bc9 /arch/x86/mm
parent03d72aa18f15df9987fe5837284e15b9ccf6e3f8 (diff)
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> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/pageattr.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 938df5e8402..270cab2e603 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -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,