[RFC patch 1/5] trace event block fix unassigned field

[Mathieu Desnoyers]

The "error" field in block_bio_complete is not assigned, leaving the memory area
uninitialized (keeping garbage data). Initialize it to 0.

We should eventually remove this field when we find out if blktrace can live
without it.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
CC: Steven Rostedt <rostedt@xxxxxxxxxxx>
CC: Frederic Weisbecker <fweisbec@xxxxxxxxx>
CC: Ingo Molnar <mingo@xxxxxxx>
CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CC: Jeff Moyer <jmoyer@xxxxxxxxxx>
CC: Jens Axboe <jens.axboe@xxxxxxxxxx>
CC: Li Zefan <lizf@xxxxxxxxxxxxxx>
CC: Alan.Brunelle@xxxxxx
---
 include/trace/events/block.h |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6-lttng/include/trace/events/block.h
===================================================================
--- linux-2.6-lttng.orig/include/trace/events/block.h
+++ linux-2.6-lttng/include/trace/events/block.h
@@ -228,6 +228,7 @@ TRACE_EVENT(block_bio_complete,
 		__entry->dev		= bio->bi_bdev->bd_dev;
 		__entry->sector		= bio->bi_sector;
 		__entry->nr_sector	= bio->bi_size >> 9;
+		__entry->error		= 0;
 		blk_fill_rwbs(__entry->rwbs, bio->bi_rw, bio->bi_size);
 	),
 

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