From 5006ea73f38caef6065d1136808413813271633f Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Fri, 20 Mar 2009 09:48:03 +0800 Subject: 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 Acked-by: Arnaldo Carvalho de Melo Cc: Jens Axboe Cc: Steven Rostedt Acked-by: Frederic Weisbecker LKML-Reference: <49C2F5D3.8090104@cn.fujitsu.com> Signed-off-by: Ingo Molnar --- kernel/trace/blktrace.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) (limited to 'kernel/trace') diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index fb3bc53835dd..73845b7968bb 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); } -- cgit v1.2.3