perf_counter: Work around gcc warning by initializing tracepoint record unconditionally

Despite that the tracepoint record is always present when the
PERF_SAMPLE_TP_RECORD flag is set, gcc raises a warning,
thinking it might not be initialized:

  kernel/perf_counter.c: In function ‘perf_counter_output’:
  kernel/perf_counter.c:2650: warning: ‘tp’ may be used uninitialized in this function

Then, initialize it to NULL and always check if it's not NULL
before dereference it.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1249698400-5441-2-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 615440a..117622c 100644 (file)
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -2646,7 +2646,7 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
                u64 counter;
        } group_entry;
        struct perf_callchain_entry *callchain = NULL;
-       struct perf_tracepoint_record *tp;
+       struct perf_tracepoint_record *tp = NULL;
        int callchain_size = 0;
        u64 time;
        struct {
@@ -2717,7 +2717,8 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
 
        if (sample_type & PERF_SAMPLE_TP_RECORD) {
                tp = data->private;
-               header.size += tp->size;
+               if (tp)
+                       header.size += tp->size;
        }
 
        ret = perf_output_begin(&handle, counter, header.size, nmi, 1);
@@ -2783,7 +2784,7 @@ static void perf_counter_output(struct perf_counter *counter, int nmi,
                }
        }
 
-       if (sample_type & PERF_SAMPLE_TP_RECORD)
+       if ((sample_type & PERF_SAMPLE_TP_RECORD) && tp)
                perf_output_copy(&handle, tp->record, tp->size);
 
        perf_output_end(&handle);