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authorHarsh Prateek Bora <harsh@linux.vnet.ibm.com>2012-07-20 18:52:15 +0530
committerStefan Hajnoczi <stefanha@linux.vnet.ibm.com>2012-08-14 10:40:39 +0100
commitdb8894f2090629a2e12b1e7324c4c5c53367e048 (patch)
treeab947a4941324c7876c4d3979f3e737e0c6a1eca /trace/simple.c
parentfd82f015a1cc2df5972f06b75b350f65da68f9cf (diff)
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trace: avoid pointer aliasing in trace_record_finish()
Declaring a TraceRecord on the stack works fine. No need for a uint8_t array and pointer aliasing. Signed-off-by: Harsh Prateek Bora <harsh@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Diffstat (limited to 'trace/simple.c')
-rw-r--r--trace/simple.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/trace/simple.c b/trace/simple.c
index 4fed07f..8e175ece7 100644
--- a/trace/simple.c
+++ b/trace/simple.c
@@ -269,12 +269,11 @@ static unsigned int write_to_buffer(unsigned int idx, void *dataptr, size_t size
void trace_record_finish(TraceBufferRecord *rec)
{
- uint8_t temp_rec[sizeof(TraceRecord)];
- TraceRecord *record = (TraceRecord *) temp_rec;
- read_from_buffer(rec->tbuf_idx, temp_rec, sizeof(TraceRecord));
+ TraceRecord record;
+ read_from_buffer(rec->tbuf_idx, &record, sizeof(TraceRecord));
smp_wmb(); /* write barrier before marking as valid */
- record->event |= TRACE_RECORD_VALID;
- write_to_buffer(rec->tbuf_idx, temp_rec, sizeof(TraceRecord));
+ record.event |= TRACE_RECORD_VALID;
+ write_to_buffer(rec->tbuf_idx, &record, sizeof(TraceRecord));
if ((trace_idx - writeout_idx) > TRACE_BUF_FLUSH_THRESHOLD) {
flush_trace_file(false);