Re: [PATCH] ftrace: use kasprintf() in ftrace_profile_tracefs()

From: Namhyung Kim
Date: Wed Mar 16 2016 - 10:19:14 EST


Hi Geliang,

On Tue, Mar 15, 2016 at 11:12 PM, Geliang Tang <geliangtang@xxxxxxx> wrote:
> Use kasprintf() instead of kmalloc() and snprintf().
>
> Signed-off-by: Geliang Tang <geliangtang@xxxxxxx>

Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>

Thanks,
Namhyung


> ---
> kernel/trace/ftrace.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 2ece9f1..69aceae 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -1030,8 +1030,7 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
> for_each_possible_cpu(cpu) {
> stat = &per_cpu(ftrace_profile_stats, cpu);
>
> - /* allocate enough for function name + cpu number */
> - name = kmalloc(32, GFP_KERNEL);
> + name = kasprintf(GFP_KERNEL, "function%d", cpu);
> if (!name) {
> /*
> * The files created are permanent, if something happens
> @@ -1043,7 +1042,6 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
> return;
> }
> stat->stat = function_stats;
> - snprintf(name, 32, "function%d", cpu);
> stat->stat.name = name;
> ret = register_stat_tracer(&stat->stat);
> if (ret) {
> --
> 2.5.0
>
>