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Diffstat (limited to 'arch/x86/include/asm/mtrr.h')
-rw-r--r--arch/x86/include/asm/mtrr.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
index e235582f9930..f768f6298419 100644
--- a/arch/x86/include/asm/mtrr.h
+++ b/arch/x86/include/asm/mtrr.h
@@ -26,7 +26,10 @@
#include <uapi/asm/mtrr.h>
-/* The following functions are for use by other drivers */
+/*
+ * The following functions are for use by other drivers that cannot use
+ * arch_phys_wc_add and arch_phys_wc_del.
+ */
# ifdef CONFIG_MTRR
extern u8 mtrr_type_lookup(u64 addr, u64 end);
extern void mtrr_save_fixed_ranges(void *);
@@ -45,6 +48,7 @@ extern void mtrr_aps_init(void);
extern void mtrr_bp_restore(void);
extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
extern int amd_special_default_mtrr(void);
+extern int phys_wc_to_mtrr_index(int handle);
# else
static inline u8 mtrr_type_lookup(u64 addr, u64 end)
{
@@ -80,6 +84,10 @@ static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
{
}
+static inline int phys_wc_to_mtrr_index(int handle)
+{
+ return -1;
+}
#define mtrr_ap_init() do {} while (0)
#define mtrr_bp_init() do {} while (0)