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authorFrederic Weisbecker <fweisbec@gmail.com>2009-08-08 04:26:35 +0200
committerIngo Molnar <mingo@elte.hu>2009-08-09 12:54:44 +0200
commit10b8e3066066708f304e0fc5cfe658e05abf943d (patch)
tree1ccebafe8ae44f6f032f993c63eb58a6c2aadea4 /kernel/perf_counter.c
parent25446036cbfc2c89faacdb4fb4603943d2197dc6 (diff)
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>
Diffstat (limited to 'kernel/perf_counter.c')
-rw-r--r--kernel/perf_counter.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 615440ab9295..117622cb73a3 100644
--- 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);