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authorLi Zefan <lizf@cn.fujitsu.com>2009-03-20 09:48:03 +0800
committerIngo Molnar <mingo@elte.hu>2009-03-21 16:16:13 +0100
commit5006ea73f38caef6065d1136808413813271633f (patch)
tree296d4f15e625303cdd111f29d990cef3c3be85c5 /kernel/trace
parent1a17662ea033674a58bad3603531b0b5d42572f6 (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.c12
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);
}