linux-kernel - Re: [PATCH] staging: gdm724x: Add parenthesis to Macro arguments

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Message-ID: <20190403042632.GA31130@kroah.com>
Date:   Wed, 3 Apr 2019 06:26:32 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Andre Dainez <andredainez@...il.com>
Cc:     lkcamp@...ts.libreplanetbr.org, realwakka@...il.com,
        straube.linux@...il.com, hle@....eu.com, rico.schrage@...il.com,
        sophie.matter@....de, Valentin.Vidic@...net.hr, simon@...anor.nu,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: gdm724x: Add parenthesis to Macro arguments

On Tue, Apr 02, 2019 at 10:04:05PM -0300, Andre Dainez wrote:
> Fix checkpatch errors:
> 
> CHECK: Macro argument 'len' may be better as '(len)' to avoid precedence issues
> CHECK: Macro argument 'nlh' may be better as '(nlh)' to avoid precedence issues
> 
> Signed-off-by: Andre Dainez <andredainez@...il.com>
> ---
>  drivers/staging/gdm724x/netlink_k.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/gdm724x/netlink_k.c b/drivers/staging/gdm724x/netlink_k.c
> index 92440c3..36d88f4 100644
> --- a/drivers/staging/gdm724x/netlink_k.c
> +++ b/drivers/staging/gdm724x/netlink_k.c
> @@ -19,8 +19,8 @@ static DEFINE_MUTEX(netlink_mutex);
>  #define ND_NLMSG_SPACE(len)	(NLMSG_SPACE(len) + ND_IFINDEX_LEN)
>  #define ND_NLMSG_DATA(nlh)	((void *)((char *)NLMSG_DATA(nlh) + \
>  						  ND_IFINDEX_LEN))
> -#define ND_NLMSG_S_LEN(len)	(len + ND_IFINDEX_LEN)
> -#define ND_NLMSG_R_LEN(nlh)	(nlh->nlmsg_len - ND_IFINDEX_LEN)
> +#define ND_NLMSG_S_LEN(len)	((len) + ND_IFINDEX_LEN)

This makes sense, but:

> +#define ND_NLMSG_R_LEN(nlh)	((nlh)->nlmsg_len - ND_IFINDEX_LEN)

That does not, correct?