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tracing: Fix unsigned int compare of zero in recursion check

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Dan's smatch found a compare bug with the result of the
trace_test_and_set_recursion() and comparing to less than
zero. If the function fails, it returns -1, but was saved in
an unsigned int, which will never be less than zero and will
ignore the result of the test if a recursion did happen.

Luckily this is the last of the recursion tests, as the
infrastructure of ftrace would catch recursions before it
got here, except for some few exceptions.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2013-01-24 07:52:34 -05:00 committed by Steven Rostedt
parent 0b07436d95
commit d41032a83b
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_functions.c
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@ -61,7 +61,7 @@ function_trace_call(unsigned long ip, unsigned long parent_ip,
struct trace_array *tr = func_trace; struct trace_array *tr = func_trace;
struct trace_array_cpu *data; struct trace_array_cpu *data;
unsigned long flags; unsigned long flags;
unsigned int bit; int bit;
int cpu; int cpu;
int pc; int pc;