linux-kernel - Re: [PATCH 19/26 v5] tracing: Use trace_seq_used() and seq_buf

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Message-ID: <20141117123250.10f6f57c@gandalf.local.home>
Date:	Mon, 17 Nov 2014 12:32:50 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>, Petr Mladek <pmladek@...e.cz>
Subject: Re: [PATCH 19/26 v5] tracing: Use trace_seq_used() and
 seq_buf_used() instead of len

On Fri, 14 Nov 2014 23:59:06 -0500
  
>  	/*
> @@ -4575,20 +4575,33 @@ static size_t
>  tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter)
>  {
>  	size_t count;
> +	int save_len;
>  	int ret;
>  
>  	/* Seq buffer is page-sized, exactly what we need. */
>  	for (;;) {
> -		count = iter->seq.seq.len;
> +		save_len = iter->seq.seq.len;
>  		ret = print_trace_line(iter);
> -		count = iter->seq.seq.len - count;
> -		if (rem < count) {
> -			rem = 0;
> -			iter->seq.seq.len -= count;
> +
> +		if (trace_seq_has_overflowed(&iter->seq)) {
> +			iter->seq.seq.len = save_len;
>  			break;
>  		}
> +
> +		/*
> +		 * This should not be hit, because it should only
> +		 * be set if the iter->seq overflowed. But check it
> +		 * anyway to be safe.
> +		 */
>  		if (ret == TRACE_TYPE_PARTIAL_LINE) {
> -			iter->seq.seq.len -= count;
> +			iter->seq.seq.len = save_len;
> +			break;
> +		}
> +
> +		count = trace_seq_used(&iter->seq) - save_len;
> +		if (rem < count) {
> +			rem = 0;
> +			iter->seq.seq.len = save_len;;
>  			break;
>  		}
>  

I don't like the fact that I did a code structure change with this
patch. This patch should be just a simple conversion of len to
seq_buf_used(). I'm going to strip this change out and put it before
this patch.

-- Steve

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