linux-kernel - [PATCH] Bluetooth: btintel: make array 'param' static, shrinks object size

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Date:   Sat,  6 Jan 2018 16:23:28 +0000
From:   Colin King <colin.king@...onical.com>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Bluetooth: btintel: make array 'param' static, shrinks object size

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

Don't populate the const read-only array 'param' on the stack but instead
make it static. Makes the object code smaller by nearly 20 bytes:

Before:
   text	   data	    bss	    dec	    hex	filename
  11605	   2629	     64	  14298	   37da	linux/drivers/bluetooth/btintel.o

After:
   text	   data	    bss	    dec	    hex	filename
  11531	   2685	     64	  14280	   37c8	linux/drivers/bluetooth/btintel.o

(gcc version 7.2.0 x86_64)

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/bluetooth/btintel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c
index 4459555c9d88..07f00e422e85 100644
--- a/drivers/bluetooth/btintel.c
+++ b/drivers/bluetooth/btintel.c
@@ -75,7 +75,7 @@ EXPORT_SYMBOL_GPL(btintel_check_bdaddr);
 
 int btintel_enter_mfg(struct hci_dev *hdev)
 {
-	const u8 param[] = { 0x01, 0x00 };
+	static const u8 param[] = { 0x01, 0x00 };
 	struct sk_buff *skb;
 
 	skb = __hci_cmd_sync(hdev, 0xfc11, 2, param, HCI_CMD_TIMEOUT);
-- 
2.15.1