From mboxrd@z Thu Jan  1 00:00:00 1970
From: xufeng.zhang@windriver.com (xufeng zhang)
Date: Fri, 05 Nov 2010 14:24:45 +0800
Subject: [ltt-dev] "Kernel/LTTV event size differs for event
 udpv4_rcv_extended: kernel 32, LTTV 28" error when view trace
Message-ID: <4CD3A32D.6030706@windriver.com>

Hi,
I'm using ltt-control-0.86 and lttv-0.12.31 on ARM to trace the kernel, 
however,
I cannot view the trace after I have successfully generated, here is the 
error
when I run 'lttv-gui -t trace1' command:
** Message: statistics viewer : background computation data ready.

** (lttv.real:6559): WARNING **: Cannot find pin_in in schedchange 671

** ERROR **: Kernel/LTTV event size differs for event 
udpv4_rcv_extended: kernel 32, LTTV 28
aborting...
/usr/local/bin/lttv-gui: line 10:  6559 Aborted                 
$LTTV_CMD.real -m lttvwindow -m guievents -m guifilter -m guicontrolflow 
-m resourceview -m guistat


And I found another people met the same problem on MIPS32, a patch have 
also been provided for MIPS32.
Here is the similar code in ARM trace-clock.c:
linux/arch/arm/mach-omap2/trace-clock.c line 537
void get_trace_clock(void)
{
         spin_lock(&trace_clock_lock);
         if (trace_clock_refcount++)
                 goto end;
         _start_trace_clock();
end:
         spin_unlock(&trace_clock_lock);
}
EXPORT_SYMBOL_GPL(get_trace_clock);

void put_trace_clock(void)
{
         spin_lock(&trace_clock_lock);
         WARN_ON(trace_clock_refcount <= 0);
         if (trace_clock_refcount != 1)
                 goto end;
         _stop_trace_clock();
end:
         trace_clock_refcount--;
         spin_unlock(&trace_clock_lock);
}
EXPORT_SYMBOL_GPL(put_trace_clock);

Could anybody figure out what's wrong with the kernel code? Any 
suggestion would be appreciated.


Thanks,
Xufeng Zhang