1 files changed, 5 insertions, 1 deletions

diff --git a/arch/arm64/include/asm/proc-fns.h b/arch/arm64/include/asm/proc-fns.h
index 9a8fd84f8fb2..941c375616e2 100644
--- a/arch/arm64/include/asm/proc-fns.h
+++ b/arch/arm64/include/asm/proc-fns.h
@@ -39,7 +39,11 @@ extern u64 cpu_do_resume(phys_addr_t ptr, u64 idmap_ttbr);
 
 #include <asm/memory.h>
 
-#define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)
+#define cpu_switch_mm(pgd,mm)                           \
+do {                                                    \
+        BUG_ON(pgd == swapper_pg_dir);                  \
+        cpu_do_switch_mm(virt_to_phys(pgd),mm);         \
+} while (0)
 
 #define cpu_get_pgd()                                   \
 ({                                                      \