gpio: gpio-stmpe: make various char arrays static const, shrinks object size

Don't populate the read-only arrays edge_det_values, rise_values and
fall_values on the stack but instead make them static and constify them.
Makes the object code smaller by over 240 bytes:

Before:
   text	   data	    bss	    dec	    hex	filename
   9525	   2520	    192	  12237	   2fcd	drivers/gpio/gpio-stmpe.o

After:
   text	   data	    bss	    dec	    hex	filename
   9025	   2776	    192	  11993	   2ed9	drivers/gpio/gpio-stmpe.o

(gcc version 7.2.0 x86_64)

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c
index e6e5cca624a7d8c9b733134c2c4276b89b98db94..e3d048e65339b223fbf60f77843fe628194c6d2a 100644 (file)
--- a/drivers/gpio/gpio-stmpe.c
+++ b/drivers/gpio/gpio-stmpe.c
@@ -273,15 +273,21 @@ static void stmpe_dbg_show_one(struct seq_file *s,
                u8 fall_reg;
                u8 irqen_reg;
 
-               char *edge_det_values[] = {"edge-inactive",
-                                          "edge-asserted",
-                                          "not-supported"};
-               char *rise_values[] = {"no-rising-edge-detection",
-                                      "rising-edge-detection",
-                                      "not-supported"};
-               char *fall_values[] = {"no-falling-edge-detection",
-                                      "falling-edge-detection",
-                                      "not-supported"};
+               static const char * const edge_det_values[] = {
+                       "edge-inactive",
+                       "edge-asserted",
+                       "not-supported"
+               };
+               static const char * const rise_values[] = {
+                       "no-rising-edge-detection",
+                       "rising-edge-detection",
+                       "not-supported"
+               };
+               static const char * const fall_values[] = {
+                       "no-falling-edge-detection",
+                       "falling-edge-detection",
+                       "not-supported"
+               };
                #define NOT_SUPPORTED_IDX 2
                u8 edge_det = NOT_SUPPORTED_IDX;
                u8 rise = NOT_SUPPORTED_IDX;