[PATCH 2/7] ASoC: atmel_wm8904: constify snd_soc_ops structures

From: Julia Lawall
Date: Sat Oct 15 2016 - 11:15:18 EST


Check for snd_soc_ops structures that are only stored in the ops field of a
snd_soc_dai_link structure. This field is declared const, so snd_soc_ops
structures that have this property can be declared as const also.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct snd_soc_ops i@p = { ... };

@ok1@
identifier r.i;
struct snd_soc_dai_link e;
position p;
@@
e.ops = &i@p;

@ok2@
identifier r.i, e;
position p;
@@
struct snd_soc_dai_link e[] = { ..., { .ops = &i@p, }, ..., };

@bad@
position p != {r.p,ok1.p,ok2.p};
identifier r.i;
struct snd_soc_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
struct snd_soc_ops i = { ... };
// </smpl>

The effect on the layout of the .o file is shown by the following output of
the size command, first before then after the transformation:

text data bss dec hex filename
2611 1536 0 4147 1033 sound/soc/atmel/atmel_wm8904.o
2675 1480 0 4155 103b sound/soc/atmel/atmel_wm8904.o

Signed-off-by: Julia Lawall <Julia.Lawall@xxxxxxx>

---
sound/soc/atmel/atmel_wm8904.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/sound/soc/atmel/atmel_wm8904.c b/sound/soc/atmel/atmel_wm8904.c
--- a/sound/soc/atmel/atmel_wm8904.c
+++ b/sound/soc/atmel/atmel_wm8904.c
@@ -53,7 +53,7 @@ static int atmel_asoc_wm8904_hw_params(s
return 0;
}

-static struct snd_soc_ops atmel_asoc_wm8904_ops = {
+static const struct snd_soc_ops atmel_asoc_wm8904_ops = {
.hw_params = atmel_asoc_wm8904_hw_params,
};