fix off by one in buffer full condition

[lttv.git] / ltt-usertrace / ltt / ltt-usertrace-fast.h

diff --git a/ltt-usertrace/ltt/ltt-usertrace-fast.h b/ltt-usertrace/ltt/ltt-usertrace-fast.h
index b0d222f83bc0467da307bd1daa53d5780b06af11..778e8eb0a6d9e93c71e2865f79287d79774d2b8a 100644 (file)
--- a/ltt-usertrace/ltt/ltt-usertrace-fast.h
+++ b/ltt-usertrace/ltt/ltt-usertrace-fast.h
@@ -476,7 +476,7 @@ static inline void * __attribute__((no_instrument_function)) ltt_reserve_slot(
                         index in the buffer being the one which will win this loop. */
                /* If the buffer is not in overwrite mode, pushing the reader only
                         happen if a sub-buffer is corrupted */
-               if((SUBBUF_TRUNC(offset_end, ltt_buf) 
+               if((SUBBUF_TRUNC(offset_end-1, ltt_buf) 
                                        - SUBBUF_TRUNC(consumed_old, ltt_buf)) 
                                                        >= ltt_buf->alloc_size)
                        consumed_new = SUBBUF_ALIGN(consumed_old, ltt_buf);