perf thread-stack: Tidy thread_stack__push_cp() usage

If 'cp' is checked in thread_stack__push_cp() a number of error checks
can be removed, reducing code size and improving readability.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20190109091835.5570-3-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c
index d52f27f..93ba3ab 100644 (file)
--- a/tools/perf/util/thread-stack.c
+++ b/tools/perf/util/thread-stack.c
@@ -493,6 +493,9 @@ static int thread_stack__push_cp(struct thread_stack *ts, u64 ret_addr,
        struct thread_stack_entry *tse;
        int err;
 
+       if (!cp)
+               return -ENOMEM;
+
        if (ts->cnt == ts->sz) {
                err = thread_stack__grow(ts);
                if (err)
@@ -576,8 +579,6 @@ static int thread_stack__bottom(struct thread_stack *ts,
 
        cp = call_path__findnew(cpr, &cpr->call_path, sym, ip,
                                ts->kernel_start);
-       if (!cp)
-               return -ENOMEM;
 
        return thread_stack__push_cp(ts, ip, sample->time, ref, cp,
                                     true, false);
@@ -609,8 +610,6 @@ static int thread_stack__no_call_return(struct thread *thread,
                        cp = call_path__findnew(cpr, &cpr->call_path,
                                                to_al->sym, sample->addr,
                                                ts->kernel_start);
-                       if (!cp)
-                               return -ENOMEM;
                        return thread_stack__push_cp(ts, 0, sample->time, ref,
                                                     cp, true, false);
                }
@@ -633,8 +632,6 @@ static int thread_stack__no_call_return(struct thread *thread,
        /* This 'return' had no 'call', so push and pop top of stack */
        cp = call_path__findnew(cpr, parent, from_al->sym, sample->ip,
                                ts->kernel_start);
-       if (!cp)
-               return -ENOMEM;
 
        err = thread_stack__push_cp(ts, sample->addr, sample->time, ref, cp,
                                    true, false);
@@ -680,8 +677,6 @@ static int thread_stack__trace_end(struct thread_stack *ts,
 
        cp = call_path__findnew(cpr, ts->stack[ts->cnt - 1].cp, NULL, 0,
                                ts->kernel_start);
-       if (!cp)
-               return -ENOMEM;
 
        ret_addr = sample->ip + sample->insn_len;
 
@@ -745,8 +740,6 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
                cp = call_path__findnew(cpr, ts->stack[ts->cnt - 1].cp,
                                        to_al->sym, sample->addr,
                                        ts->kernel_start);
-               if (!cp)
-                       return -ENOMEM;
                err = thread_stack__push_cp(ts, ret_addr, sample->time, ref,
                                            cp, false, trace_end);
        } else if (sample->flags & PERF_IP_FLAG_RETURN) {