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

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Date:	Thu, 10 Sep 2015 10:23:54 -0400
From:	Jason Baron <jbaron@...mai.com>
To:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	gregkh@...uxfoundation.org
Subject: Re: [PATCH] lib/dynamic_debug.c: use kstrdup_const

Looks fine to me.

Acked-by: Jason Baron <jbaron@...mai.com>

Andrew, want to pick this up?

Thanks,

-Jason

On 09/09/2015 05:40 PM, Rasmus Villemoes wrote:
> 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);
>  }
>  
> 
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