linux-kernel - [PATCH 2/2] rtlwifi: rtl8192de: make arrays static const, makes object smaller

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Date:   Sat, 31 Jul 2021 13:40:44 +0100
From:   Colin King <colin.king@...onical.com>
To:     Ping-Ke Shih <pkshih@...ltek.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] rtlwifi: rtl8192de:  make arrays static const, makes object smaller

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

Don't populate arrays the stack but instead make them static const
Makes the object code smaller by 852 bytes.

Before:
   text	   data	    bss	    dec	    hex	filename
 128211	  44250	   1024	 173485	  2a5ad	../realtek/rtlwifi/rtl8192de/phy.o

After:
   text	   data	    bss	    dec	    hex	filename
 127199	  44410	   1024	 172633	  2a259	../realtek/rtlwifi/rtl8192de/phy.o

(gcc version 10.2.0)

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
index 4eaa40d73baf..79956254f798 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
@@ -1354,7 +1354,7 @@ static void _rtl92d_phy_switch_rf_setting(struct ieee80211_hw *hw, u8 channel)
 
 u8 rtl92d_get_rightchnlplace_for_iqk(u8 chnl)
 {
-	u8 channel_all[59] = {
+	static const u8 channel_all[59] = {
 		1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
 		36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58,
 		60, 62, 64, 100, 102, 104, 106, 108, 110, 112,
@@ -3220,7 +3220,7 @@ void rtl92d_phy_config_macphymode_info(struct ieee80211_hw *hw)
 u8 rtl92d_get_chnlgroup_fromarray(u8 chnl)
 {
 	u8 group;
-	u8 channel_info[59] = {
+	static const u8 channel_info[59] = {
 		1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
 		36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56,
 		58, 60, 62, 64, 100, 102, 104, 106, 108,
-- 
2.31.1