linux-kernel - Re: [RFC][PATCH 01/18 v2] ftrace: Add hash list to save RCU unsafe functions

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Date:	Tue, 3 Sep 2013 17:15:16 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [RFC][PATCH 01/18 v2] ftrace: Add hash list to save RCU unsafe
 functions

On Sat, 31 Aug 2013 01:11:18 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:


> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index a6d098c..3750360 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -1356,6 +1356,23 @@ ftrace_hash_rec_disable(struct ftrace_ops *ops, int filter_hash);
>  static void
>  ftrace_hash_rec_enable(struct ftrace_ops *ops, int filter_hash);
>  
> +static int ftrace_convert_size_to_bits(int size)
> +{
> +	int bits;
> +
> +	/*
> +	 * Make the hash size about 1/2 the # found
> +	 */
> +	for (size /= 2; size; size >>= 1)
> +		bits++;
> +
> +	/* Don't allocate too much */
> +	if (bits > FTRACE_HASH_MAX_BITS)
> +		bits = FTRACE_HASH_MAX_BITS;
> +
> +	return bits;
> +}
> +


Just found this bug. Strange that gcc never gave me a warning :-/

-- Steve
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