linux-kernel - Re: [PATCH 04/15] staging: rtl8723bs: put parentheses on macros with complex values in include/basic

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Date:   Fri, 26 Mar 2021 13:04:08 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Fabio Aiuto <fabioaiuto83@...il.com>
Cc:     gregkh@...uxfoundation.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/15] staging: rtl8723bs: put parentheses on macros with
 complex values in include/basic_types.h

On Fri, Mar 26, 2021 at 10:09:11AM +0100, Fabio Aiuto wrote:
> fix the following checkpatch warnings:
> 
> ERROR: Macros with complex values should be enclosed in parentheses
> 154: FILE: drivers/staging/rtl8723bs/include/basic_types.h:154:
> +#define SET_BITS_TO_LE_4BYTE(__pstart, __bitoffset, __bitlen, __val) \
> --
> ERROR: Macros with multiple statements should be enclosed in
> a do - while loop
> 161: FILE: drivers/staging/rtl8723bs/include/basic_types.h:161:
> +#define SET_BITS_TO_LE_2BYTE(__pstart, __bitoffset, __bitlen, __val) \
> --
> ERROR: Macros with complex values should be enclosed in parentheses
> 168: FILE: drivers/staging/rtl8723bs/include/basic_types.h:168:
> +#define SET_BITS_TO_LE_1BYTE(__pstart, __bitoffset, __bitlen, __val) \
> 
> parentheses solution preferred for all fixes and made macros more
> readables
> 
> Signed-off-by: Fabio Aiuto <fabioaiuto83@...il.com>
> ---
>  .../staging/rtl8723bs/include/basic_types.h   | 30 +++++++++++--------
>  1 file changed, 18 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/staging/rtl8723bs/include/basic_types.h b/drivers/staging/rtl8723bs/include/basic_types.h
> index 76304086107a..5054c2e3384c 100644
> --- a/drivers/staging/rtl8723bs/include/basic_types.h
> +++ b/drivers/staging/rtl8723bs/include/basic_types.h
> @@ -152,24 +152,30 @@
>  /* 		Set subfield of little-endian 4-byte value to specified value. */
>  /*  */
>  #define SET_BITS_TO_LE_4BYTE(__pstart, __bitoffset, __bitlen, __val) \
> -		*((u32 *)(__pstart)) =				\
> -		(						\
> -		LE_BITS_CLEARED_TO_4BYTE(__pstart, __bitoffset, __bitlen) | \
> -		((((u32)__val) & BIT_LEN_MASK_32(__bitlen)) << (__bitoffset)) \
> +		(\
> +			*((u32 *)(__pstart)) =				\
> +			(						\
> +				LE_BITS_CLEARED_TO_4BYTE(__pstart, __bitoffset, __bitlen) | \
> +				((((u32)__val) & BIT_LEN_MASK_32(__bitlen)) << (__bitoffset)) \
> +			)\
>  		)
>  

These macros are terrible and this makes it uglier.  Better to just
ignore checkpatch until we can figure out a way to re-write this
properly.

regards,
dan carpenter