linux-kernel - Re: [RFC][PATCH 14/23 v4] tracing: Convert seq_buf_path() to be like seq

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Date:	Fri, 14 Nov 2014 12:47:47 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Petr Mladek <pmladek@...e.cz>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>
Subject: Re: [RFC][PATCH 14/23 v4] tracing: Convert seq_buf_path() to be
 like seq_path()

On Fri, 14 Nov 2014 17:53:08 +0100
Petr Mladek <pmladek@...e.cz> wrote:


> >  /**
> > diff --git a/kernel/trace/trace_seq.c b/kernel/trace/trace_seq.c
> > index 3c63b619d6b7..475412e31de5 100644
> > --- a/kernel/trace/trace_seq.c
> > +++ b/kernel/trace/trace_seq.c
> > @@ -342,7 +342,7 @@ int trace_seq_path(struct trace_seq *s, const struct path *path)
> >  		return 0;
> >  	}
> >  
> > -	ret = seq_buf_path(&s->seq, path);
> > +	ret = seq_buf_path(&s->seq, path, "\n");
> >  
> >  	if (unlikely(seq_buf_has_overflowed(&s->seq))) {
> >  		s->seq.len = save_len;
> > @@ -350,7 +350,7 @@ int trace_seq_path(struct trace_seq *s, const struct path *path)
> >  		return 0;
> >  	}
> >  
> > -	return ret;
> > +	return 1;
> 
> Ah, I have just realized that this should return -1 when
> seq_buf_path() returns -1.

It really doesn't matter as long as it's not zero. The one user just
tests if the return is zero or not.

trace_seq() doesn't have to follow all the same rules as seq_buf()
does, as seq_buf() is more in line with seq_file().


> 
> Note that set_buf_path() does not longer calls seq_buf_set_overflow(s)
> when the path handling fails. Therefore the above check for overflow
> will probably never happen.

This is in a transitional state of the patch series. The final version
of seq_buf_path() will call seq_buf_commit() which will put the seq_buf
in an overflow state if it isn't correct. Trying to fix this version
here will probably just cause me to make another stupid mistake and
ruin the final version ;-)

-- Steve

> 
> Best Regards,
> Petr
> 
> >  }
> >  EXPORT_SYMBOL_GPL(trace_seq_path);
> >  
> > -- 
> > 2.1.1
> > 
> > 

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