blktrace: pdu_buf of pc events should be unsigned

I got this:
  8,0    1   305.417782332  2037  I   R 32 (ffffff9e 10 00 ...) [bash]

It should be:
  8,0    1   305.417782332  2037  I   R 32 (9e 10 00 ...) [bash]

[ Impact: fix output of pc events ]

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4A07C6B3.9080802@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index e099f8cc1d1c..05b4747fd873 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1065,7 +1065,7 @@ static int blk_log_action(struct trace_iterator *iter, const char *act)
 
 static int blk_log_dump_pdu(struct trace_seq *s, const struct trace_entry *ent)
 {
-        const char *pdu_buf;
+        const unsigned char *pdu_buf;
         int pdu_len;
         int i, end, ret;