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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>
This commit is contained in:
Li Zefan 2009-03-20 09:48:03 +08:00 committed by Ingo Molnar
parent 1a17662ea0
commit 5006ea73f3
1 changed files with 3 additions and 9 deletions
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12
kernel/trace/blktrace.c
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@ -30,7 +30,7 @@
static unsigned int blktrace_seq __read_mostly = 1; static unsigned int blktrace_seq __read_mostly = 1;
static struct trace_array *blk_tr; 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 */ /* Select an alternative, minimalistic output than the original one */
#define TRACE_BLK_OPT_CLASSIC 0x1 #define TRACE_BLK_OPT_CLASSIC 0x1
@ -1111,9 +1111,7 @@ static int blk_tracer_init(struct trace_array *tr)
{ {
blk_tr = tr; blk_tr = tr;
blk_tracer_start(tr); blk_tracer_start(tr);
mutex_lock(&blk_probe_mutex); blk_tracer_enabled = true;
blk_tracer_enabled++;
mutex_unlock(&blk_probe_mutex);
return 0; return 0;
} }
@ -1131,11 +1129,7 @@ static void blk_tracer_reset(struct trace_array *tr)
if (!atomic_read(&blk_probes_ref)) if (!atomic_read(&blk_probes_ref))
return; return;
mutex_lock(&blk_probe_mutex); blk_tracer_enabled = false;
blk_tracer_enabled--;
WARN_ON(blk_tracer_enabled < 0);
mutex_unlock(&blk_probe_mutex);
blk_tracer_stop(tr); blk_tracer_stop(tr);
} }