linux-kernel - [PATCH 1/2] i2c: bcm-iproc: constify i2c_adapter

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Date:   Sat, 15 Oct 2016 19:32:01 +0200
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     kernel-janitors@...r.kernel.org, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] i2c: bcm-iproc: constify i2c_adapter_quirks structures

Check for i2c_adapter_quirks structures that are only stored in the
quirks field of an i2c_adapter structure.  This field is declared
const, so i2c_adapter_quirks structures that have this property can be
declared as const also.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct i2c_adapter_quirks i@p = { ... };

@ok@
identifier r.i;
struct i2c_adapter e;
position p;
@@
e.quirks = &i@p;

@bad@
position p != {r.p,ok.p};
identifier r.i;
struct i2c_adapter_quirks e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct i2c_adapter_quirks i = { ... };
// </smpl>

The effect on the layout of the .o file is shown by the following
output of the size command, first before then after the
transformation:

   text    data     bss     dec     hex filename
   3458     744       8    4210    1072 drivers/i2c/busses/i2c-bcm-iproc.o
   3490     720       8    4218    107a drivers/i2c/busses/i2c-bcm-iproc.o

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/i2c/busses/i2c-bcm-iproc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
index 326b3db..318df55 100644
--- a/drivers/i2c/busses/i2c-bcm-iproc.c
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -395,7 +395,7 @@ static uint32_t bcm_iproc_i2c_functionality(struct i2c_adapter *adap)
 	.functionality = bcm_iproc_i2c_functionality,
 };
 
-static struct i2c_adapter_quirks bcm_iproc_i2c_quirks = {
+static const struct i2c_adapter_quirks bcm_iproc_i2c_quirks = {
 	/* need to reserve one byte in the FIFO for the slave address */
 	.max_read_len = M_TX_RX_FIFO_SIZE - 1,
 };