linux-kernel - [PATCH] ASoC: rt1305: make array pd static const, makes object smaller

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Message-Id: <20190907074156.21907-1-colin.king@canonical.com>
Date:   Sat,  7 Sep 2019 08:41:56 +0100
From:   Colin King <colin.king@...onical.com>
To:     Bard Liao <bardliao@...ltek.com>,
        Oder Chiou <oder_chiou@...ltek.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: rt1305: make array pd static const, makes object smaller

From: Colin Ian King <colin.king@...onical.com>

Don't populate the array pd on the stack but instead make it
static const. Makes the object code smaller by 93 bytes.

Before:
   text	   data	    bss	    dec	    hex	filename
  38961	   9784	     64	  48809	   bea9	sound/soc/codecs/rt1305.o

After:
   text	   data	    bss	    dec	    hex	filename
  38804	   9848	     64	  48716	   be4c	sound/soc/codecs/rt1305.o

(gcc version 9.2.1, amd64)

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 sound/soc/codecs/rt1305.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/rt1305.c b/sound/soc/codecs/rt1305.c
index 9909369483f0..e27742abfa76 100644
--- a/sound/soc/codecs/rt1305.c
+++ b/sound/soc/codecs/rt1305.c
@@ -608,7 +608,8 @@ static const struct snd_soc_dapm_route rt1305_dapm_routes[] = {
 
 static int rt1305_get_clk_info(int sclk, int rate)
 {
-	int i, pd[] = {1, 2, 3, 4, 6, 8, 12, 16};
+	int i;
+	static const int pd[] = {1, 2, 3, 4, 6, 8, 12, 16};
 
 	if (sclk <= 0 || rate <= 0)
 		return -EINVAL;
-- 
2.20.1