1 files changed, 8 insertions, 0 deletions

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index a9776ba475d4..82b41d56bb98 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -716,3 +716,11 @@ void __init zone_sizes_init(void)
         free_area_init_nodes(max_zone_pfns);
 }
 
+void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache)
+{
+        /* entry 0 MUST be WB (hardwired to speed up translations) */
+        BUG_ON(!entry && cache != _PAGE_CACHE_MODE_WB);
+
+        __cachemode2pte_tbl[cache] = __cm_idx2pte(entry);
+        __pte2cachemode_tbl[entry] = cache;
+}