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| author | Julia Lawall <julia@diku.dk> | 2009-10-17 08:43:17 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-10-17 09:29:10 +0200 |
| commit | f39cdf25bf77219676ec5360980ac40b1a7e144a (patch) | |
| tree | 2143a3653933efc5ffacea647ce8be72952b3a44 /tools/perf/builtin-trace.c | |
| parent | 434a83c3fbb951908a3a52040f7f0e0b8ba00dd0 (diff) | |
| download | lwn-f39cdf25bf77219676ec5360980ac40b1a7e144a.tar.gz lwn-f39cdf25bf77219676ec5360980ac40b1a7e144a.zip | |
perf tools: Move dereference after NULL test
In each case, if the NULL test on thread is needed, then the
dereference should be after the NULL test.
A simplified version of the semantic match that detects this
problem is as follows (http://coccinelle.lip6.fr/):
// <smpl>
@match exists@
expression x, E;
identifier fld;
@@
* x->fld
... when != \(x = E\|&x\)
* x == NULL
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
LKML-Reference: <Pine.LNX.4.64.0910170842500.9213@ask.diku.dk>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/builtin-trace.c')
| -rw-r--r-- | tools/perf/builtin-trace.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index ce8459ac2845..4c129ff0bb16 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -80,14 +80,14 @@ process_sample_event(event_t *event, unsigned long offset, unsigned long head) (void *)(long)ip, (long long)period); - dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid); - if (thread == NULL) { eprintf("problem processing %d event, skipping it.\n", event->header.type); return -1; } + dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid); + if (sample_type & PERF_SAMPLE_RAW) { struct { u32 size; |