netdev - Re: [PATCH] cfg80211 debugfs: Cleanup some checkpatch issues

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Date:   Fri, 27 Jan 2017 11:48:35 -0800
From:   Joe Perches <joe@...ches.com>
To:     Pichugin Dmitry <smokeman85@...il.com>, johannes@...solutions.net,
        davem@...emloft.net
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cfg80211 debugfs: Cleanup some checkpatch issues

On Fri, 2017-01-27 at 22:26 +0300, Pichugin Dmitry wrote:
> This fixes the checkpatch.pl warnings:
> * Macros should not use a trailing semicolon.
> * Spaces required around that '='.
> * Symbolic permissions 'S_IRUGO' are not preferred.

OK

> * Macro argument reuse 'buflen' - possible side-effects

Not all checkpatch messages need fixing.
This is one of them.

> diff --git a/net/wireless/debugfs.c b/net/wireless/debugfs.c
[]
> @@ -17,11 +17,12 @@
>  static ssize_t name## _read(struct file *file, char __user *userbuf,	\
>  			    size_t count, loff_t *ppos)			\
>  {									\
> -	struct wiphy *wiphy= file->private_data;		\
> -	char buf[buflen];						\
> +	struct wiphy *wiphy = file->private_data;			\
> +	int __buflen = __builtin_constant_p(buflen) ? buflen : -1;	\
> +	char buf[__buflen];						\

That's rather an odd change too