[PATCH 1/3] um: pgtable.h: fix W=1 warning for empty body in 'do' statement

[Randy Dunlap]

Use the common kernel style to eliminate a warning:

./arch/um/include/asm/pgtable.h:305:47: warning: suggest braces around empty body in ‘do’ statement [-Wempty-body]
 #define update_mmu_cache(vma,address,ptep) do ; while (0)
                                               ^
mm/filemap.c:3212:3: note: in expansion of macro ‘update_mmu_cache’
   update_mmu_cache(vma, addr, vmf->pte);
   ^~~~~~~~~~~~~~~~

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Jeff Dike <jdike@xxxxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: Anton Ivanov <anton.ivanov@xxxxxxxxxxxxxxxxxx>
Cc: linux-um@xxxxxxxxxxxxxxxxxxx
---
 arch/um/include/asm/pgtable.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20210413.orig/arch/um/include/asm/pgtable.h
+++ linux-next-20210413/arch/um/include/asm/pgtable.h
@@ -302,7 +302,7 @@ static inline pte_t pte_modify(pte_t pte
 struct mm_struct;
 extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
 
-#define update_mmu_cache(vma,address,ptep) do ; while (0)
+#define update_mmu_cache(vma,address,ptep) do {} while (0)
 
 /* Encode and de-code a swap entry */
 #define __swp_type(x)			(((x).val >> 5) & 0x1f)