parisc: Change L1_CACHE_BYTES to 16

Change L1_CACHE_BYTES to 16 bytes.
Tested for 16 days on rp3440.

Additional remarks from Helge Deller:
Saves ~17 kb of kernel code/data and gives a slight performance improvement in
various test cases.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/include/asm/cache.h

@@ -7,20 +7,12 @@
 
 
 /*
- * PA 2.0 processors have 64-byte cachelines; PA 1.1 processors have
- * 32-byte cachelines.  The default configuration is not for SMP anyway,
- * so if you're building for SMP, you should select the appropriate
- * processor type.  There is a potential livelock danger when running
- * a machine with this value set too small, but it's more probable you'll
- * just ruin performance.
+ * PA 2.0 processors have 64 and 128-byte L2 cachelines; PA 1.1 processors
+ * have 32-byte cachelines.  The L1 length appears to be 16 bytes but this
+ * is not clearly documented.
  */
-#ifdef CONFIG_PA20
-#define L1_CACHE_BYTES 64
-#define L1_CACHE_SHIFT 6
-#else
-#define L1_CACHE_BYTES 32
-#define L1_CACHE_SHIFT 5
-#endif
+#define L1_CACHE_BYTES 16
+#define L1_CACHE_SHIFT 4
 
 #ifndef __ASSEMBLY__