linux-kernel - [PATCH] char: ipmi: constify ipmi_smi

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Date:   Mon, 16 Jan 2017 00:45:00 +0530
From:   Bhumika Goyal <bhumirks@...il.com>
To:     julia.lawall@...6.fr, minyard@....org, benh@...nel.crashing.org,
        paulus@...ba.org, mpe@...erman.id.au,
        openipmi-developer@...ts.sourceforge.net,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     Bhumika Goyal <bhumirks@...il.com>
Subject: [PATCH] char: ipmi: constify ipmi_smi_handlers structures

Declare ipmi_smi_handlers structures as const as they are only passed as
an argument to the function ipmi_register_smi. This argument is of type
const, so ipmi_smi_handlers structures having similar properties can be
declared const too.
Done using Coccinelle:

@r1 disable optional_qualifier@
identifier i;
position p;
@@
static struct ipmi_smi_handlers i@......};

@ok1@
identifier r1.i;
position p;
@@
ipmi_register_smi(&i@p,...)

@bad@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p

@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
+const
struct ipmi_smi_handlers i;

Size details after cross compiling the .o file for powerpc architecture

File size before:
  text	   data	    bss	    dec	    hex	filename
  2777	    288	      0	   3065	    bf9	drivers/char/ipmi/ipmi_powernv.o

File size after:
  text	   data	    bss	    dec	    hex	filename
   2873	    192	      0	   3065	    bf9	drivers/char/ipmi/ipmi_powernv.o

Signed-off-by: Bhumika Goyal <bhumirks@...il.com>
---
 drivers/char/ipmi/ipmi_powernv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/ipmi/ipmi_powernv.c b/drivers/char/ipmi/ipmi_powernv.c
index 6e658aa..b338a4b 100644
--- a/drivers/char/ipmi/ipmi_powernv.c
+++ b/drivers/char/ipmi/ipmi_powernv.c
@@ -196,7 +196,7 @@ static void ipmi_powernv_poll(void *send_info)
 	ipmi_powernv_recv(smi);
 }
 
-static struct ipmi_smi_handlers ipmi_powernv_smi_handlers = {
+static const struct ipmi_smi_handlers ipmi_powernv_smi_handlers = {
 	.owner			= THIS_MODULE,
 	.start_processing	= ipmi_powernv_start_processing,
 	.sender			= ipmi_powernv_send,
-- 
1.9.1