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@rasmusvillemoes.dk>
Cc: Jason Baron <jbaron@akamai.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index e491e02eff549fbe8c2e245c3f475b908818938f..e3952e9c8ec04256e656ada5ca39ccdd62843093 100644 (file)
--- 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);
 }