linux-kernel - [PATCH] fsl/fman: make arrays port_ids static, reduces object code size

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Message-Id: <20170831132449.27600-1-colin.king@canonical.com>
Date:   Thu, 31 Aug 2017 14:24:49 +0100
From:   Colin King <colin.king@...onical.com>
To:     Madalin Bucur <madalin.bucur@....com>, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] fsl/fman: make arrays port_ids static, reduces object code size

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

Don't populate the arrays port_ids on the stack, instead make them static.
Makes the object code smaller by over 700 bytes:

Before:
   text	   data	    bss	    dec	    hex	filename
  28785	   5832	    192	  34809	   87f9	fman.o

After:
   text	   data	    bss	    dec	    hex	filename
  27921	   5992	    192	  34105	   8539	fman.o

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/net/ethernet/freescale/fman/fman.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/freescale/fman/fman.c b/drivers/net/ethernet/freescale/fman/fman.c
index f420dac2f484..9530405030a7 100644
--- a/drivers/net/ethernet/freescale/fman/fman.c
+++ b/drivers/net/ethernet/freescale/fman/fman.c
@@ -2368,15 +2368,21 @@ u32 fman_get_qman_channel_id(struct fman *fman, u32 port_id)
 	int i;
 
 	if (fman->state->rev_info.major >= 6) {
-		u32 port_ids[] = {0x30, 0x31, 0x28, 0x29, 0x2a, 0x2b,
-				  0x2c, 0x2d, 0x2, 0x3, 0x4, 0x5, 0x7, 0x7};
+		static const u32 port_ids[] = {
+			0x30, 0x31, 0x28, 0x29, 0x2a, 0x2b,
+			0x2c, 0x2d, 0x2, 0x3, 0x4, 0x5, 0x7, 0x7
+		};
+
 		for (i = 0; i < fman->state->num_of_qman_channels; i++) {
 			if (port_ids[i] == port_id)
 				break;
 		}
 	} else {
-		u32 port_ids[] = {0x30, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x1,
-				  0x2, 0x3, 0x4, 0x5, 0x7, 0x7};
+		static const u32 port_ids[] = {
+			0x30, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x1,
+			0x2, 0x3, 0x4, 0x5, 0x7, 0x7
+		};
+
 		for (i = 0; i < fman->state->num_of_qman_channels; i++) {
 			if (port_ids[i] == port_id)
 				break;
-- 
2.14.1