x86: mtrr_cleanup: treat WRPROT as UNCACHEABLE

For the purpose of MTRR canonicalization, treat WRPROT as UNCACHEABLE.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 663e530e08e..5994a9f78f3 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -759,7 +759,8 @@ x86_get_mtrr_mem_range(struct res_range *range, int nr_range,
         /* take out UC ranges */
         for (i = 0; i < num_var_ranges; i++) {
                 type = range_state[i].type;
-                if (type != MTRR_TYPE_UNCACHABLE)
+                if (type != MTRR_TYPE_UNCACHABLE &&
+                    type != MTRR_TYPE_WRPROT)
                         continue;
                 size = range_state[i].size_pfn;
                 if (!size)
@@ -1248,6 +1249,8 @@ static int __init mtrr_cleanup(unsigned address_bits)
                         continue;
                 if (!size)
                         type = MTRR_NUM_TYPES;
+                if (type == MTRR_TYPE_WRPROT)
+                        type = MTRR_TYPE_UNCACHABLE;
                 num[type]++;
         }