linux-kernel - [PATCH] kernel: cpu: hotplug: constify attribute

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Message-Id: <f9079e94e12b36d245e7adbf67d312bc5d0250c6.1498737970.git.arvind.yadav.cs@gmail.com>
Date:   Thu, 29 Jun 2017 17:40:47 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     tglx@...utronix.de, bigeasy@...utronix.de, mingo@...nel.org,
        anna-maria@...utronix.de, boris.ostrovsky@...cle.com,
        rcochran@...utronix.de, torvalds@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] kernel: cpu: hotplug: constify attribute_group structures.

attribute_groups are not supposed to change at runtime. All functions
working with attribute_groups provided by <linux/sysfs.h> work with const
attribute_group. So mark the non-const structs as const.

File size before:
   text	   data	    bss	    dec	    hex	filename
  12582	  15361	     20	  27963	   6d3b	kernel/cpu.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
  12710	  15265	     20	  27995	   6d5b	kernel/cpu.o

Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
---
 kernel/cpu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 9ae6fbe..45455f9 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1684,7 +1684,7 @@ static ssize_t show_cpuhp_target(struct device *dev,
 	NULL
 };
 
-static struct attribute_group cpuhp_cpu_attr_group = {
+static const struct attribute_group cpuhp_cpu_attr_group = {
 	.attrs = cpuhp_cpu_attrs,
 	.name = "hotplug",
 	NULL
@@ -1716,7 +1716,7 @@ static ssize_t show_cpuhp_states(struct device *dev,
 	NULL
 };
 
-static struct attribute_group cpuhp_cpu_root_attr_group = {
+static const struct attribute_group cpuhp_cpu_root_attr_group = {
 	.attrs = cpuhp_cpu_root_attrs,
 	.name = "hotplug",
 	NULL
-- 
1.9.1