[PATCH] tracing/histograms: Simplify last_cmd_set()

[Christophe JAILLET]

Turn a kzalloc()+strcpy()+strncat() into an equivalent and less verbose
kasprintf().

Signed-off-by: Christophe JAILLET <christophe.jail...@wanadoo.fr>
---
 kernel/trace/trace_events_hist.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index d06938ae0717..1abc07fba1b9 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -774,23 +774,16 @@ static void last_cmd_set(struct trace_event_file *file, 
char *str)
 {
        const char *system = NULL, *name = NULL;
        struct trace_event_call *call;
-       int len;
 
        if (!str)
                return;
 
-       /* sizeof() contains the nul byte */
-       len = sizeof(HIST_PREFIX) + strlen(str);
        kfree(last_cmd);
-       last_cmd = kzalloc(len, GFP_KERNEL);
+
+       last_cmd = kasprintf(GFP_KERNEL, HIST_PREFIX "%s", str);
        if (!last_cmd)
                return;
 
-       strcpy(last_cmd, HIST_PREFIX);
-       /* Again, sizeof() contains the nul byte */
-       len -= sizeof(HIST_PREFIX);
-       strncat(last_cmd, str, len);
-
        if (file) {
                call = file->event_call;
                system = call->class->system;
-- 
2.34.1