diff options
| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-03-20 09:48:03 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-21 16:16:13 +0100 |
| commit | 5006ea73f38caef6065d1136808413813271633f (patch) | |
| tree | 296d4f15e625303cdd111f29d990cef3c3be85c5 /kernel/trace | |
| parent | 1a17662ea033674a58bad3603531b0b5d42572f6 (diff) | |
blktrace: make blk_tracer_enabled a bool flag
It doesn't have to be a counter, and it can be a bool flag instead.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <49C2F5D3.8090104@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/blktrace.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index fb3bc53835d..73845b7968b 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -30,7 +30,7 @@ static unsigned int blktrace_seq __read_mostly = 1; static struct trace_array *blk_tr; -static int __read_mostly blk_tracer_enabled; +static bool blk_tracer_enabled __read_mostly; /* Select an alternative, minimalistic output than the original one */ #define TRACE_BLK_OPT_CLASSIC 0x1 @@ -1111,9 +1111,7 @@ static int blk_tracer_init(struct trace_array *tr) { blk_tr = tr; blk_tracer_start(tr); - mutex_lock(&blk_probe_mutex); - blk_tracer_enabled++; - mutex_unlock(&blk_probe_mutex); + blk_tracer_enabled = true; return 0; } @@ -1131,11 +1129,7 @@ static void blk_tracer_reset(struct trace_array *tr) if (!atomic_read(&blk_probes_ref)) return; - mutex_lock(&blk_probe_mutex); - blk_tracer_enabled--; - WARN_ON(blk_tracer_enabled < 0); - mutex_unlock(&blk_probe_mutex); - + blk_tracer_enabled = false; blk_tracer_stop(tr); } |