linux-kernel - [PATCH] HID: prodikeys: make array keys static const, makes object smaller

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Date:   Thu,  5 Sep 2019 17:54:06 +0100
From:   Colin King <colin.king@...onical.com>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] HID: prodikeys: make array keys static const, makes object smaller

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

Don't populate the array keys on the stack but instead make it
static const. Makes the object code smaller by 166 bytes.

Before:
   text	   data	    bss	    dec	    hex	filename
  18931	   5872	    480	  25283	   62c3	drivers/hid/hid-prodikeys.o

After:
   text	   data	    bss	    dec	    hex	filename
  18669	   5968	    480	  25117	   621d	drivers/hid/hid-prodikeys.o

(gcc version 9.2.1, amd64)

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

diff --git a/drivers/hid/hid-prodikeys.c b/drivers/hid/hid-prodikeys.c
index 21544ebff855..fb6841ebe4d9 100644
--- a/drivers/hid/hid-prodikeys.c
+++ b/drivers/hid/hid-prodikeys.c
@@ -516,7 +516,7 @@ static void pcmidi_setup_extra_keys(
 		MY PICTURES =>	KEY_WORDPROCESSOR
 		MY MUSIC=>	KEY_SPREADSHEET
 	*/
-	unsigned int keys[] = {
+	static const unsigned int keys[] = {
 		KEY_FN,
 		KEY_MESSENGER, KEY_CALENDAR,
 		KEY_ADDRESSBOOK, KEY_DOCUMENTS,
@@ -532,7 +532,7 @@ static void pcmidi_setup_extra_keys(
 		0
 	};
 
-	unsigned int *pkeys = &keys[0];
+	const unsigned int *pkeys = &keys[0];
 	unsigned short i;
 
 	if (pm->ifnum != 1)  /* only set up ONCE for interace 1 */
-- 
2.20.1