linux-kernel - Re: [re: PATCH v2 00/15 - 07/11] dyndbg: __skip

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Date: Mon, 18 Dec 2023 18:17:51 +0100
From: Petr Mladek <pmladek@...e.com>
To: Jim Cromie <jim.cromie@...il.com>
Cc: lb@...ihalf.com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, bleung@...gle.com, contact@...rsion.fr,
	daniel@...ll.ch, dianders@...omium.org, groeck@...gle.com,
	jbaron@...mai.com, john.ogness@...utronix.de, keescook@...omium.org,
	ppaalanen@...il.com, rostedt@...dmis.org, seanpaul@...omium.org,
	sergey.senozhatsky@...il.com, upstream@...ihalf.com,
	vincent.whitchurch@...s.com, yanivt@...gle.com,
	gregkh@...uxfoundation.org
Subject: Re: [re: PATCH v2 00/15 -  07/11] dyndbg: __skip_spaces

On Thu 2023-12-07 17:15:10, Jim Cromie wrote:
> This private version treats a comma like a space.

Please, make it clear that this patch adds a new function.
Also please explain why it is needed and what are the effects.

> Its not known necessary ATM, but seems prudent.

It might be that I am not a native speaker but I can't parse
the above sentence at all.

What is not known?
What is prudent?


> Signed-off-by: Jim Cromie <jim.cromie@...il.com>
> ---
>  lib/dynamic_debug.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
> index a380b8151dd8..c974f6e19ca1 100644
> --- a/lib/dynamic_debug.c
> +++ b/lib/dynamic_debug.c
> @@ -628,6 +628,14 @@ static int ddebug_change(const struct ddebug_query *query,
>  	return nfound;
>  }
>  
> +char *__skip_spaces(const char *str)
> +{
> +	str = skip_spaces(str);
> +	if (*str == ',')
> +		str = skip_spaces(++str);
> +	return (char *)str;
> +}

The function should not be called "skip_spaces" when it skips also
characters which are not typical white-space characters.

Also the "__" are usually used the other way around. func()
is usually a wrapper around __func().

Please, use another name. If you can't find a good name then
it suggests that the design is bad. The result would likely
be hard to understand and maintain.

Best Regards,
Petr

PS: I am sorry, I do not have time for a proper review. I primary wanted
    to check if the patchset somehow affected printk(). And I realized
    that I do not understand what the changes are about. The commit
    messages and the motivation might make sense only to people who
    know the big picture. But I was not able to get the picture
    for the changes in dot,comma,space handling.