linux-kernel - Re: [PATCH 20/26 v5] seq_buf: Add seq_buf_can

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Date:	Mon, 17 Nov 2014 12:36:42 -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 20/26 v5] seq_buf: Add seq_buf_can_fit() helper function

On Fri, 14 Nov 2014 23:59:07 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> 
> Add a seq_buf_can_fit() helper function that removes the possible mistakes
> of comparing the seq_buf length plus added data compared to the size of
> the buffer.
> 
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
>  kernel/trace/seq_buf.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/kernel/trace/seq_buf.c b/kernel/trace/seq_buf.c
> index ce17f65268ed..89d1bd5c27fe 100644
> --- a/kernel/trace/seq_buf.c
> +++ b/kernel/trace/seq_buf.c
> @@ -16,6 +16,11 @@
>  #include <linux/seq_file.h>
>  #include <linux/seq_buf.h>
>  

I'm adding a comment here:

/**
 * seq_buf_can_fit - can the new data fit in the current buffer?
 * @s: the seq_buf descriptor
 * @len: The length to see if it can fit in the current buffer
 *
 * Returns true if there's enough unused space in the seq_buf buffer
 * to fit the amount of new data according to @len.
 */


-- Steve

> +static bool seq_buf_can_fit(struct seq_buf *s, size_t len)
> +{
> +	return s->len + len < s->size;
> +}
> +
--
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