diff options
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/xentrace/xentrace.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/tools/xentrace/xentrace.c b/tools/xentrace/xentrace.c index 26415bdb7d..bd276cc3ed 100644 --- a/tools/xentrace/xentrace.c +++ b/tools/xentrace/xentrace.c @@ -362,9 +362,18 @@ int monitor_tbufs(int outfd) if ( cons == prod ) continue; - assert(prod > cons); + assert(cons < 2*data_size); + assert(prod < 2*data_size); + + // NB: if (prod<cons), then (prod-cons)%data_size will not yield + // the correct answer because data_size is not a power of 2. + if ( prod < cons ) + window_size = (prod + 2*data_size) - cons; + else + window_size = prod - cons; + assert(window_size > 0); + assert(window_size <= data_size); - window_size = prod - cons; start_offset = cons % data_size; end_offset = prod % data_size; |