I used the clang-tidy qemu-round check to generate the fix:
https://github.com/elmarco/clang-tools-extra

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Richard Henderson <rth@twiddle.net>
---
 target/ppc/mem_helper.c | 2 +-
 target/ppc/translate.c  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/ppc/mem_helper.c b/target/ppc/mem_helper.c
index e6383c6bfa..a34e604db3 100644
--- a/target/ppc/mem_helper.c
+++ b/target/ppc/mem_helper.c
@@ -111,7 +111,7 @@ void helper_lswx(CPUPPCState *env, target_ulong addr, uint32_t reg,
                  uint32_t ra, uint32_t rb)
 {
     if (likely(xer_bc != 0)) {
-        int num_used_regs = (xer_bc + 3) / 4;
+        int num_used_regs = DIV_ROUND_UP(xer_bc, 4);
         if (unlikely((ra != 0 && lsw_reg_in_range(reg, num_used_regs, ra)) ||
                      lsw_reg_in_range(reg, num_used_regs, rb))) {
             raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index 01233e8b6d..606b605ba0 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -2880,7 +2880,7 @@ static void gen_lswi(DisasContext *ctx)
     }
     if (nb == 0)
         nb = 32;
-    nr = (nb + 3) / 4;
+    nr = DIV_ROUND_UP(nb, 4);
     if (unlikely(lsw_reg_in_range(start, nr, ra))) {
         gen_inval_exception(ctx, POWERPC_EXCP_INVAL_LSWX);
         return;
-- 
2.14.1.146.gd35faa819