linux-kernel - [PATCH] net: hns3: make array spec_opcode static const, makes object smaller

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Message-Id: <20210819115813.6692-1-colin.king@canonical.com>
Date:   Thu, 19 Aug 2021 12:58:13 +0100
From:   Colin King <colin.king@...onical.com>
To:     Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Huazhong Tan <tanhuazhong@...wei.com>, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net: hns3: make array spec_opcode static const, makes object smaller

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

Don't populate the array spec_opcode on the stack but instead it
static const. Makes the object code smaller by 158 bytes:

Before:
   text   data   bss     dec    hex filename
  12271   3976   128   16375   3ff7 .../hisilicon/hns3/hns3pf/hclge_cmd.o

After:
   text   data   bss     dec    hex filename
  12017   4072   128   16217   3f59 .../hisilicon/hns3/hns3pf/hclge_cmd.o

(gcc version 10.3.0)

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 .../hisilicon/hns3/hns3pf/hclge_cmd.c         | 24 ++++++++++---------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
index 887297e37cf3..13042f1cac6f 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
@@ -169,17 +169,19 @@ static bool hclge_is_special_opcode(u16 opcode)
 	/* these commands have several descriptors,
 	 * and use the first one to save opcode and return value
 	 */
-	u16 spec_opcode[] = {HCLGE_OPC_STATS_64_BIT,
-			     HCLGE_OPC_STATS_32_BIT,
-			     HCLGE_OPC_STATS_MAC,
-			     HCLGE_OPC_STATS_MAC_ALL,
-			     HCLGE_OPC_QUERY_32_BIT_REG,
-			     HCLGE_OPC_QUERY_64_BIT_REG,
-			     HCLGE_QUERY_CLEAR_MPF_RAS_INT,
-			     HCLGE_QUERY_CLEAR_PF_RAS_INT,
-			     HCLGE_QUERY_CLEAR_ALL_MPF_MSIX_INT,
-			     HCLGE_QUERY_CLEAR_ALL_PF_MSIX_INT,
-			     HCLGE_QUERY_ALL_ERR_INFO};
+	static const u16 spec_opcode[] = {
+		HCLGE_OPC_STATS_64_BIT,
+		HCLGE_OPC_STATS_32_BIT,
+		HCLGE_OPC_STATS_MAC,
+		HCLGE_OPC_STATS_MAC_ALL,
+		HCLGE_OPC_QUERY_32_BIT_REG,
+		HCLGE_OPC_QUERY_64_BIT_REG,
+		HCLGE_QUERY_CLEAR_MPF_RAS_INT,
+		HCLGE_QUERY_CLEAR_PF_RAS_INT,
+		HCLGE_QUERY_CLEAR_ALL_MPF_MSIX_INT,
+		HCLGE_QUERY_CLEAR_ALL_PF_MSIX_INT,
+		HCLGE_QUERY_ALL_ERR_INFO
+	};
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(spec_opcode); i++) {
-- 
2.32.0