linux-kernel - [PATCH] CIFS: make arrays static const, reduces object code size

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Message-Id: <20170919152739.24749-1-colin.king@canonical.com>
Date:   Tue, 19 Sep 2017 16:27:39 +0100
From:   Colin King <colin.king@...onical.com>
To:     Steve French <sfrench@...ba.org>, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] CIFS: make arrays static const, reduces object code size

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

Don't populate the read-only arrays types[] on the stack, instead make
them both static const.  Makes the object code smaller by over 200 bytes:

Before:
   text	   data	    bss	    dec	    hex	filename
 111503	  37696	    448	 149647	  2488f	fs/cifs/file.o

After:
   text	   data	    bss	    dec	    hex	filename
 111140	  37856	    448	 149444	  247c4	fs/cifs/file.o

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 fs/cifs/file.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 0786f19d288f..822311919163 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1102,8 +1102,10 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
 	struct cifs_tcon *tcon;
 	unsigned int num, max_num, max_buf;
 	LOCKING_ANDX_RANGE *buf, *cur;
-	int types[] = {LOCKING_ANDX_LARGE_FILES,
-		       LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
+	static const int types[] = {
+		LOCKING_ANDX_LARGE_FILES,
+		LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES
+	};
 	int i;
 
 	xid = get_xid();
@@ -1434,8 +1436,10 @@ cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
 		  unsigned int xid)
 {
 	int rc = 0, stored_rc;
-	int types[] = {LOCKING_ANDX_LARGE_FILES,
-		       LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
+	static const int types[] = {
+		LOCKING_ANDX_LARGE_FILES,
+		LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES
+	};
 	unsigned int i;
 	unsigned int max_num, num, max_buf;
 	LOCKING_ANDX_RANGE *buf, *cur;
-- 
2.14.1