]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
tracing: fix incorrect return type of ns2usecs()
authorLai Jiangshan <laijs@cn.fujitsu.com>
Mon, 30 Mar 2009 05:48:00 +0000 (13:48 +0800)
committerIngo Molnar <mingo@elte.hu>
Tue, 7 Apr 2009 11:59:23 +0000 (13:59 +0200)
commitcf8e3474654f20433aab9aa35826d43b5f245008
treebbb3e87ca324ae4192fd524c0777047ee075c5d9
parent301fd748e2c81e78e74edbc694a64caa7b95dda2
tracing: fix incorrect return type of ns2usecs()

Impact: fix time output bug in 32bits system

ns2usecs() returns 'long', it's incorrect.

(In i386)
...
          <idle>-0     [000]   521.442100: _spin_lock <-tick_do_update_jiffies64
          <idle>-0     [000]   521.442101: do_timer <-tick_do_update_jiffies64
          <idle>-0     [000]   521.442102: update_wall_time <-do_timer
          <idle>-0     [000]   521.442102: update_xtime_cache <-update_wall_time
....
(It always print the time less than 2200 seconds besides ...)
Because 'long' is 32bits in i386. ( (1<<31) useconds is about 2200 seconds)

...
          <idle>-0     [001] 4154502640.134759: rcu_bh_qsctr_inc <-__do_softirq
          <idle>-0     [001] 4154502640.134760: _local_bh_enable <-__do_softirq
          <idle>-0     [001] 4154502640.134761: idle_cpu <-irq_exit
...
(very large value)
Because 'long' is a signed type and it is 32bits in i386.

Changes in v2:
return 'unsigned long long' instead of 'cycle_t'

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
LKML-Reference: <49D05D10.4030009@cn.fujitsu.com>
Reported-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/trace/trace.c
kernel/trace/trace.h
kernel/trace/trace_output.c