1 files changed, 7 insertions, 1 deletions

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 01be9ec3bf79..a1f0e1d0ddc2 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -1125,8 +1125,14 @@ static int populate_pgd(struct cpa_data *cpa, unsigned long addr)
 static int __cpa_process_fault(struct cpa_data *cpa, unsigned long vaddr,
                                int primary)
 {
-        if (cpa->pgd)
+        if (cpa->pgd) {
+                /*
+                 * Right now, we only execute this code path when mapping
+                 * the EFI virtual memory map regions, no other users
+                 * provide a ->pgd value. This may change in the future.
+                 */
                 return populate_pgd(cpa, vaddr);
+        }
 
         /*
          * Ignore all non primary paths.