linux-kernel - [PATCH] regulator: lp8788: make various char arrays static const, shrinks object size

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Message-Id: <20171128193021.25692-1-colin.king@canonical.com>
Date:   Tue, 28 Nov 2017 19:30:21 +0000
From:   Colin King <colin.king@...onical.com>
To:     Milo Kim <milo.kim@...com>, Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] regulator: lp8788: make various char arrays static const, shrinks object size

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

Don't populate the read-only arrays b1_name and b2_name on the stack
but instead make them static and constify them.  Makes the object code
smaller by over 260 bytes:

Before:
   text	   data	    bss	    dec	    hex	filename
   6961	   2256	      0	   9217	   2401	drivers/regulator/lp8788-buck.o

After:
   text	   data	    bss	    dec	    hex	filename
   6696	   2256	      0	   8952	   22f8	drivers/regulator/lp8788-buck.o

(gcc version 7.2.0 x86_64)

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/regulator/lp8788-buck.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/lp8788-buck.c b/drivers/regulator/lp8788-buck.c
index ec46290b647e..ab3a2138fb91 100644
--- a/drivers/regulator/lp8788-buck.c
+++ b/drivers/regulator/lp8788-buck.c
@@ -426,8 +426,10 @@ static int lp8788_dvs_gpio_request(struct platform_device *pdev,
 				enum lp8788_buck_id id)
 {
 	struct lp8788_platform_data *pdata = buck->lp->pdata;
-	char *b1_name = "LP8788_B1_DVS";
-	char *b2_name[] = { "LP8788_B2_DVS1", "LP8788_B2_DVS2" };
+	static const char * const b1_name = "LP8788_B1_DVS";
+	static const char * const b2_name[] = {
+		"LP8788_B2_DVS1", "LP8788_B2_DVS2"
+	};
 	int i, gpio, ret;
 
 	switch (id) {
-- 
2.14.1