linux-kernel - RE: [PATCH] staging: gdm724x: Fix Duplication of Side Effects

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Date:   Thu, 31 Mar 2022 10:29:04 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Alaa Mohamed' <eng.alaamohamedsoliman.am@...il.com>,
        "outreachy@...ts.linux.dev" <outreachy@...ts.linux.dev>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-staging@...ts.linux.dev" <linux-staging@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] staging: gdm724x: Fix Duplication of Side Effects

From: Alaa Mohamed
> Sent: 31 March 2022 11:19
> 
> Fix Duplication of Side Effects for GDM_TTY_READY(gdm) macro
> reported by checkpatch
> "CHECK: Macro argument reuse 'gdm' - possible side-effects?"
> 
> Signed-off-by: Alaa Mohamed <eng.alaamohamedsoliman.am@...il.com>
> ---
>  drivers/staging/gdm724x/gdm_tty.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
> index 04df6f9f5403..6f0274470e69 100644
> --- a/drivers/staging/gdm724x/gdm_tty.c
> +++ b/drivers/staging/gdm724x/gdm_tty.c
> @@ -27,7 +27,9 @@
> 
>  #define MUX_TX_MAX_SIZE 2048
> 
> -#define GDM_TTY_READY(gdm) (gdm && gdm->tty_dev && gdm->port.count)
> +#define GDM_TTY_READY(_gdm) \
> +	({ typeof(_gdm) (gdm) = (_gdm); \
> +	(gdm && gdm->tty_dev && gdm->port.count); })

Did you test this?

see https://godbolt.org/z/cazPrrzPv

	David

-
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