linux-kernel - Re: [PATCH] [JANITOR] Actually use the calculated cnt in kernel/trace/ring

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Date:	Mon, 21 Mar 2016 15:44:45 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mika Kukkonen <mikukkon@....fi>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] [JANITOR] Actually use the calculated cnt in
 kernel/trace/ring_buffer.c

On Mon, 21 Mar 2016 21:28:39 +0200
Mika Kukkonen <mikukkon@....fi> wrote:

> Was deleting an old github kernel tree and noticed this one line patch
> I had made years back. Can't remember the compiler warning anymore but
> clearly it complained about pointless assigment to cnt since it is not
> used after that, although to me it looks like it should.

I'll take this. Thanks Mika!

-- Steve

> 
> Signed-off-by: Mika Kukkonen <mikukkon@....fi>
> 
> diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
> index 95181e3..22d1007 100644
> --- a/kernel/trace/ring_buffer.c
> +++ b/kernel/trace/ring_buffer.c
> @@ -4756,7 +4756,7 @@ static __init int rb_write_something(struct
> rb_test_data *data, bool nested)
>         cnt = data->cnt + (nested ? 27 : 0);
> 
>         /* Multiply cnt by ~e, to make some unique increment */
> -       size = (data->cnt * 68 / 25) % (sizeof(rb_string) - 1);
> +       size = (cnt * 68 / 25) % (sizeof(rb_string) - 1);
> 
>         len = size + sizeof(struct rb_item);
> 
> --MiKu