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trace: fix output of stack trace

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Impact: fix to output of stack trace

If a function is not found in the stack of the stack tracer, the
number printed is quite strange. This fixes the algorithm to handle
missing functions better.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt 2008-12-03 11:04:50 -05:00 committed by Ingo Molnar
parent 166d3c7994
commit 0a37119d96
1 changed files with 4 additions and 1 deletions
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5
kernel/trace/trace_stack.c
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@ -78,6 +78,7 @@ static inline void check_stack(void)
* on a new max, so it is far from a fast path. * on a new max, so it is far from a fast path.
*/ */
while (i < max_stack_trace.nr_entries) { while (i < max_stack_trace.nr_entries) {
int found = 0;
stack_dump_index[i] = this_size; stack_dump_index[i] = this_size;
p = start; p = start;
@ -86,12 +87,14 @@ static inline void check_stack(void)
if (*p == stack_dump_trace[i]) { if (*p == stack_dump_trace[i]) {
this_size = stack_dump_index[i++] = this_size = stack_dump_index[i++] =
(top - p) * sizeof(unsigned long); (top - p) * sizeof(unsigned long);
found = 1;
/* Start the search from here */ /* Start the search from here */
start = p + 1; start = p + 1;
} }
} }
i++; if (!found)
i++;
} }
out: out: