linux-kernel - [PATCH] unicode: make array 'token' static const, makes object smaller

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Date:   Fri,  6 Sep 2019 14:58:07 +0100
From:   Colin King <colin.king@...onical.com>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>,
        linux-fsdevel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] unicode: make array 'token' static const, makes object smaller

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

Don't populate the array 'token' on the stack but instead make it
static const. Makes the object code smaller by 234 bytes.

Before:
   text	   data	    bss	    dec	    hex	filename
   5371	    272	      0	   5643	   160b	fs/unicode/utf8-core.o

After:
   text	   data	    bss	    dec	    hex	filename
   5041	    368	      0	   5409	   1521	fs/unicode/utf8-core.o

(gcc version 9.2.1, amd64)

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 fs/unicode/utf8-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/unicode/utf8-core.c b/fs/unicode/utf8-core.c
index 71ca4d047d65..2a878b739115 100644
--- a/fs/unicode/utf8-core.c
+++ b/fs/unicode/utf8-core.c
@@ -154,7 +154,7 @@ static int utf8_parse_version(const char *version, unsigned int *maj,
 {
 	substring_t args[3];
 	char version_string[12];
-	const struct match_token token[] = {
+	static const struct match_token token[] = {
 		{1, "%d.%d.%d"},
 		{0, NULL}
 	};
-- 
2.20.1