linux-kernel - Re: [RFC][PATCH 07/12 v3] tracing: Have seq

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Message-ID: <20141106151314.GG2001@dhcp128.suse.cz>
Date:	Thu, 6 Nov 2014 16:13:14 +0100
From:	Petr Mladek <pmladek@...e.cz>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH 07/12 v3] tracing: Have seq_buf use full buffer

On Wed 2014-11-05 15:21:30, Steven Rostedt wrote:
> On Wed, 5 Nov 2014 17:31:50 +0100
> Petr Mladek <pmladek@...e.cz> wrote:
> 
> 
> > >  /**
> > >   * seq_buf_print_seq - move the contents of seq_buf into a seq_file
> > > @@ -55,7 +55,7 @@ int seq_buf_vprintf(struct seq_buf *s, const char *fmt, va_list args)
> > >  
> > >  	if (s->len < s->size) {
> > >  		len = vsnprintf(s->buffer + s->len, s->size - s->len, fmt, args);
> > > -		if (s->len + len < s->size) {
> > > +		if (s->len + len <= s->size) {
> > 
> > This is always true because we limit vsnprintf() to write (s->size -
> > s->len) bytes. Similar problem is also in the other parts of this
> > patch.
> 
> No, len is the length of bytes that should have been written, not the
> amount that has been written.

That is cool! I did not know that there was also this variant of the
printf() functions. I am still learning.

Best Regards,
Petr
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