linux-kernel - [PATCH] lib/dynamic_debug.c: use kstrdup

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Date:	Wed,  9 Sep 2015 23:40:42 +0200
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Jason Baron <jbaron@...mai.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] lib/dynamic_debug.c: use kstrdup_const

Using kstrdup_const, thus reusing .rodata when possible, saves around
2 kB of runtime memory on my laptop/.config combination.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 lib/dynamic_debug.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index e491e02eff54..e3952e9c8ec0 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -42,7 +42,7 @@ extern struct _ddebug __stop___verbose[];
 
 struct ddebug_table {
 	struct list_head link;
-	char *mod_name;
+	const char *mod_name;
 	unsigned int num_ddebugs;
 	struct _ddebug *ddebugs;
 };
@@ -841,12 +841,12 @@ int ddebug_add_module(struct _ddebug *tab, unsigned int n,
 			     const char *name)
 {
 	struct ddebug_table *dt;
-	char *new_name;
+	const char *new_name;
 
 	dt = kzalloc(sizeof(*dt), GFP_KERNEL);
 	if (dt == NULL)
 		return -ENOMEM;
-	new_name = kstrdup(name, GFP_KERNEL);
+	new_name = kstrdup_const(name, GFP_KERNEL);
 	if (new_name == NULL) {
 		kfree(dt);
 		return -ENOMEM;
@@ -907,7 +907,7 @@ int ddebug_dyndbg_module_param_cb(char *param, char *val, const char *module)
 static void ddebug_table_free(struct ddebug_table *dt)
 {
 	list_del_init(&dt->link);
-	kfree(dt->mod_name);
+	kfree_const(dt->mod_name);
 	kfree(dt);
 }
 
-- 
2.1.3

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