An item in the trace buffer that is bigger than one entry may be split up using the TRACE_CONT entry. This makes it a virtual single entry. The current code increments the iterator index even while traversing TRACE_CONT entries, making it look like the iterator is further than it actually is. This patch adds code to not increment the iterator index while skipping over TRACE_CONT entries. Signed-off-by: Steven Rostedt --- kernel/trace/trace.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) Index: linux-tip.git/kernel/trace/trace.c =================================================================== --- linux-tip.git.orig/kernel/trace/trace.c 2008-09-03 16:46:30.000000000 -0400 +++ linux-tip.git/kernel/trace/trace.c 2008-09-03 16:50:03.000000000 -0400 @@ -1117,9 +1117,8 @@ trace_entry_idx(struct trace_array *tr, } /* Increment the index counter of an iterator by one */ -static void trace_iterator_increment(struct trace_iterator *iter, int cpu) +static void __trace_iterator_increment(struct trace_iterator *iter, int cpu) { - iter->idx++; iter->next_idx[cpu]++; iter->next_page_idx[cpu]++; @@ -1132,6 +1131,12 @@ static void trace_iterator_increment(str } } +static void trace_iterator_increment(struct trace_iterator *iter, int cpu) +{ + iter->idx++; + __trace_iterator_increment(iter, cpu); +} + static struct trace_entry * trace_entry_next(struct trace_array *tr, struct trace_array_cpu *data, struct trace_iterator *iter, int cpu) @@ -1153,7 +1158,7 @@ trace_entry_next(struct trace_array *tr, /* find a real entry */ do { - trace_iterator_increment(iter, cpu); + __trace_iterator_increment(iter, cpu); ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); } while (ent && ent->type != TRACE_CONT); @@ -1187,7 +1192,7 @@ __find_next_entry(struct trace_iterator ent = trace_entry_next(tr, data, iter, cpu); else { while (ent && ent->type == TRACE_CONT) { - trace_iterator_increment(iter, cpu); + __trace_iterator_increment(iter, cpu); ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); } @@ -1566,7 +1571,7 @@ trace_seq_print_cont(struct trace_seq *s do { trace_seq_printf(s, "%s", ent->cont.buf); - trace_iterator_increment(iter, iter->cpu); + __trace_iterator_increment(iter, iter->cpu); ent = trace_entry_idx(tr, data, iter, iter->cpu); } while (ent && ent->type == TRACE_CONT); } -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/