linux-kernel - Re: [PATCH 1/2] tracing: add __print_symbolic

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Message-ID: <4DDDE9E6.7090303@cn.fujitsu.com>
Date:	Thu, 26 May 2011 01:49:26 -0400
From:	liubo <liubo2009@...fujitsu.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Linux Btrfs <linux-btrfs@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Chris Mason <chris.mason@...cle.com>
Subject: Re: [PATCH 1/2] tracing: add __print_symbolic_u64 to avoid warnings
 on 32bit machine

On 05/01/2011 11:35 AM, Steven Rostedt wrote:
> On Fri, 2011-04-29 at 18:01 +0800, liubo wrote:
>> ping?
> 
> Sorry, I've been trying to get the new ftrace function tracer features
> out ASAP. I plan on looking at this when I'm done.
> 
> Thanks,
> 

Hi, Steven,

I've seen your latest git-pull, but these 2 patches are not included yet,
so is there any problem with them?

If it does, I can be helpful. :)

thanks,
liubo

> -- Steve
> 
>> On 04/19/2011 09:35 AM, liubo wrote:
>>> Filesystem, like Btrfs, has some "ULL" macros, and when these macros are passed
>>> to tracepoints'__print_symbolic(), there will be 64->32 truncate WARNINGS during
>>> compiling on 32bit box.
>>>
>>> Signed-off-by: Liu Bo <liubo2009@...fujitsu.com>
>>> ---
>>>  include/linux/ftrace_event.h |   12 ++++++++++++
>>>  include/trace/ftrace.h       |   13 +++++++++++++
>>>  kernel/trace/trace_output.c  |   27 +++++++++++++++++++++++++++
>>>  3 files changed, 52 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
>>> index 47e3997..efb2330 100644
>>> --- a/include/linux/ftrace_event.h
>>> +++ b/include/linux/ftrace_event.h
>>> @@ -16,6 +16,11 @@ struct trace_print_flags {
>>>  	const char		*name;
>>>  };
>>>  
>>> +struct trace_print_flags_u64 {
>>> +	unsigned long long	mask;
>>> +	const char		*name;
>>> +};
>>> +
>>>  const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
>>>  				   unsigned long flags,
>>>  				   const struct trace_print_flags *flag_array);
>>> @@ -23,6 +28,13 @@ const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
>>>  const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
>>>  				     const struct trace_print_flags *symbol_array);
>>>  
>>> +#if BITS_PER_LONG == 32
>>> +const char *ftrace_print_symbols_seq_u64(struct trace_seq *p,
>>> +					 unsigned long long val,
>>> +					 const struct trace_print_flags_u64
>>> +								 *symbol_array);
>>> +#endif
>>> +
>>>  const char *ftrace_print_hex_seq(struct trace_seq *p,
>>>  				 const unsigned char *buf, int len);
>>>  
>>> diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
>>> index 3e68366..533c49f 100644
>>> --- a/include/trace/ftrace.h
>>> +++ b/include/trace/ftrace.h
>>> @@ -205,6 +205,19 @@
>>>  		ftrace_print_symbols_seq(p, value, symbols);		\
>>>  	})
>>>  
>>> +#undef __print_symbolic_u64
>>> +#if BITS_PER_LONG == 32
>>> +#define __print_symbolic_u64(value, symbol_array...)			\
>>> +	({								\
>>> +		static const struct trace_print_flags_u64 symbols[] =	\
>>> +			{ symbol_array, { -1, NULL } };			\
>>> +		ftrace_print_symbols_seq_u64(p, value, symbols);	\
>>> +	})
>>> +#else
>>> +#define __print_symbolic_u64(value, symbol_array...)			\
>>> +			__print_symbolic(value, symbol_array)
>>> +#endif
>>> +
>>>  #undef __print_hex
>>>  #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
>>>  
>>> diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
>>> index 02272ba..b783504 100644
>>> --- a/kernel/trace/trace_output.c
>>> +++ b/kernel/trace/trace_output.c
>>> @@ -353,6 +353,33 @@ ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
>>>  }
>>>  EXPORT_SYMBOL(ftrace_print_symbols_seq);
>>>  
>>> +#if BITS_PER_LONG == 32
>>> +const char *
>>> +ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
>>> +			 const struct trace_print_flags_u64 *symbol_array)
>>> +{
>>> +	int i;
>>> +	const char *ret = p->buffer + p->len;
>>> +
>>> +	for (i = 0;  symbol_array[i].name; i++) {
>>> +
>>> +		if (val != symbol_array[i].mask)
>>> +			continue;
>>> +
>>> +		trace_seq_puts(p, symbol_array[i].name);
>>> +		break;
>>> +	}
>>> +
>>> +	if (!p->len)
>>> +		trace_seq_printf(p, "0x%llx", val);
>>> +
>>> +	trace_seq_putc(p, 0);
>>> +
>>> +	return ret;
>>> +}
>>> +EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
>>> +#endif
>>> +
>>>  const char *
>>>  ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
>>>  {
> 
> 
> 

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