linux-kernel - [PATCH] mm/zswap: constify struct kernel_param

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Date:   Sat, 26 Aug 2017 23:11:48 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     sjenning@...hat.com, ddstreet@...e.org
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH] mm/zswap: constify struct kernel_param_ops uses

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

Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
---
 mm/zswap.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index d39581a..030fbf9 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -82,7 +82,7 @@ static u64 zswap_duplicate_entry;
 static bool zswap_enabled;
 static int zswap_enabled_param_set(const char *,
 				   const struct kernel_param *);
-static struct kernel_param_ops zswap_enabled_param_ops = {
+static const struct kernel_param_ops zswap_enabled_param_ops = {
 	.set =		zswap_enabled_param_set,
 	.get =		param_get_bool,
 };
@@ -93,7 +93,7 @@ module_param_cb(enabled, &zswap_enabled_param_ops, &zswap_enabled, 0644);
 static char *zswap_compressor = ZSWAP_COMPRESSOR_DEFAULT;
 static int zswap_compressor_param_set(const char *,
 				      const struct kernel_param *);
-static struct kernel_param_ops zswap_compressor_param_ops = {
+static const struct kernel_param_ops zswap_compressor_param_ops = {
 	.set =		zswap_compressor_param_set,
 	.get =		param_get_charp,
 	.free =		param_free_charp,
@@ -105,7 +105,7 @@ module_param_cb(compressor, &zswap_compressor_param_ops,
 #define ZSWAP_ZPOOL_DEFAULT "zbud"
 static char *zswap_zpool_type = ZSWAP_ZPOOL_DEFAULT;
 static int zswap_zpool_param_set(const char *, const struct kernel_param *);
-static struct kernel_param_ops zswap_zpool_param_ops = {
+static const struct kernel_param_ops zswap_zpool_param_ops = {
 	.set =		zswap_zpool_param_set,
 	.get =		param_get_charp,
 	.free =		param_free_charp,
-- 
2.7.4