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

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Date:	Sun, 01 May 2011 11:35:24 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	liubo <liubo2009@...fujitsu.com>
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 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,

-- 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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