linux-kernel - [PATCH] fpga: mgr: altera-ps-spi: make array dummy static, shrinks object size

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Date:   Thu, 29 Nov 2018 23:10:16 +0000
From:   Colin King <colin.king@...onical.com>
To:     Alan Tull <atull@...nel.org>, Moritz Fischer <mdf@...nel.org>,
        linux-fpga@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] fpga: mgr: altera-ps-spi: make array dummy static, shrinks object size

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

Don't populate the const array dummy on the stack but instead
make it static. Makes the object code smaller by 26 bytes:

Before:
   text	   data	    bss	    dec	    hex	filename
   7371	   2032	      0	   9403	   24bb	drivers/fpga/altera-ps-spi.o

After:
   text	   data	    bss	    dec	    hex	filename
   7281	   2096	      0	   9377	   24a1	drivers/fpga/altera-ps-spi.o

(gcc version 8.2.0 x86_64)

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

diff --git a/drivers/fpga/altera-ps-spi.c b/drivers/fpga/altera-ps-spi.c
index 8c18beec6b57..678d0115f840 100644
--- a/drivers/fpga/altera-ps-spi.c
+++ b/drivers/fpga/altera-ps-spi.c
@@ -205,7 +205,7 @@ static int altera_ps_write_complete(struct fpga_manager *mgr,
 				    struct fpga_image_info *info)
 {
 	struct altera_ps_conf *conf = mgr->priv;
-	const char dummy[] = {0};
+	static const char dummy[] = {0};
 	int ret;
 
 	if (gpiod_get_value_cansleep(conf->status)) {
-- 
2.19.1