linux-kernel - Re: [PATCH 3/4] Staging: ks7010: hostif: Fix multiple use of arguments in rate and event masking macros.

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Date:   Mon, 19 Feb 2018 18:12:05 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Quytelda Kahja <quytelda@...alin.org>
Cc:     wsa@...-dreams.de, devel@...verdev.osuosl.org,
        driverdev-devel@...uxdriverproject.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] Staging: ks7010: hostif: Fix multiple use of
 arguments in rate and event masking macros.

On Fri, Feb 16, 2018 at 06:25:02PM -0800, Quytelda Kahja wrote:
> Use GCC extensions to prevent macro arguments from accidentally being evaluated
> multiple times when the macro is called.
> 
> Signed-off-by: Quytelda Kahja <quytelda@...alin.org>
> ---
>  drivers/staging/ks7010/ks_hostif.h | 74 +++++++++++++++++++++++++-------------
>  1 file changed, 50 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/staging/ks7010/ks_hostif.h b/drivers/staging/ks7010/ks_hostif.h
> index 5bae8d468e23..750ac86cee77 100644
> --- a/drivers/staging/ks7010/ks_hostif.h
> +++ b/drivers/staging/ks7010/ks_hostif.h
> @@ -599,19 +599,39 @@ struct hostif_mic_failure_confirm_t {
>  #define TX_RATE_48M	(uint8_t)(480 / 5)
>  #define TX_RATE_54M	(uint8_t)(540 / 5)
>  
> -#define IS_11B_RATE(A) (((A & RATE_MASK) == TX_RATE_1M) || ((A & RATE_MASK) == TX_RATE_2M) || \
> -			((A & RATE_MASK) == TX_RATE_5M) || ((A & RATE_MASK) == TX_RATE_11M))
> -
> -#define IS_OFDM_RATE(A) (((A & RATE_MASK) == TX_RATE_6M) || ((A & RATE_MASK) == TX_RATE_12M) || \
> -			 ((A & RATE_MASK) == TX_RATE_24M) || ((A & RATE_MASK) == TX_RATE_9M) || \
> -			 ((A & RATE_MASK) == TX_RATE_18M) || ((A & RATE_MASK) == TX_RATE_36M) || \
> -			 ((A & RATE_MASK) == TX_RATE_48M) || ((A & RATE_MASK) == TX_RATE_54M))
> -
> -#define IS_11BG_RATE(A) (IS_11B_RATE(A) || IS_OFDM_RATE(A))
> -
> -#define IS_OFDM_EXT_RATE(A) (((A & RATE_MASK) == TX_RATE_9M) || ((A & RATE_MASK) == TX_RATE_18M) || \
> -			     ((A & RATE_MASK) == TX_RATE_36M) || ((A & RATE_MASK) == TX_RATE_48M) || \
> -			     ((A & RATE_MASK) == TX_RATE_54M))
> +#define IS_11B_RATE(A)							\
> +	({								\
> +		typeof(A) A_ = (A);					\
> +		((A_ & RATE_MASK) == TX_RATE_1M) ||			\
> +			((A_ & RATE_MASK) == TX_RATE_2M) ||		\
> +			((A_ & RATE_MASK) == TX_RATE_5M) ||		\
> +			((A_ & RATE_MASK) == TX_RATE_11M); })
> +

Again, please just make these real functions, if they are actually used.

thanks,

greg k-h