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perf/trace: Properly use u64 to hold event_id 

The 64-bit attr.config value for perf trace events was being copied into
an "int" before doing a comparison, meaning the top 32 bits were
being truncated.

As far as I can tell this didn't cause any errors, but it did mean
it was possible to create valid aliases for all the tracepoint ids
which I don't think was intended.  (For example, 0xffffffff00000018
and 0x18 both enable the same tracepoint).

Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1311151236100.11932@vincent-weaver-1.um.maine.edu
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Vince Weaver 2013-11-15 12:39:45 -05:00 committed by Ingo Molnar
parent 06db0b2171
commit 0022cedd4a
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_event_perf.c
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@ -179,7 +179,7 @@ static int perf_trace_event_init(struct ftrace_event_call *tp_event,
int perf_trace_init(struct perf_event *p_event)
{
struct ftrace_event_call *tp_event;
int event_id = p_event->attr.config;
u64 event_id = p_event->attr.config;
int ret = -EINVAL;
mutex_lock(&event_mutex);