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Commit 5006ea73 authored by Li Zefan's avatar Li Zefan Committed by Ingo Molnar
Browse files

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: default avatarLi Zefan <lizf@cn.fujitsu.com>
Acked-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Acked-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <49C2F5D3.8090104@cn.fujitsu.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 1a17662e

kernel/trace/blktrace.c

+3 −9
Original line number Diff line number Diff line
@@ -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);

}