[MIPS] TX49: Fix use of CDEX build_store_reg()

The commit a923660d786a53e78834b19062f7af2535f7f8ad accidently
prevents TX49 from using CDEX.  Use build_dst_pref() only if prefetch
for store was really available.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 4 insertions, 5 deletions

diff --git a/arch/mips/mm/pg-r4k.c b/arch/mips/mm/pg-r4k.c
index d41fc5885e87..dc795be62807 100644
--- a/arch/mips/mm/pg-r4k.c
+++ b/arch/mips/mm/pg-r4k.c
@@ -243,11 +243,10 @@ static void __init __build_store_reg(int reg)
 
 static inline void build_store_reg(int reg)
 {
-        if (cpu_has_prefetch)
-                if (reg)
-                        build_dst_pref(pref_offset_copy);
-                else
-                        build_dst_pref(pref_offset_clear);
+        int pref_off = cpu_has_prefetch ?
+                (reg ? pref_offset_copy : pref_offset_clear) : 0;
+        if (pref_off)
+                build_dst_pref(pref_off);
         else if (cpu_has_cache_cdex_s)
                 build_cdex_s();
         else if (cpu_has_cache_cdex_p)