linux-kernel - Re: [PATCH v4 3/5] staging: rtl8192e: fix coding style errors (macros in parentheses)

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Date:	Sun, 15 Mar 2015 21:51:00 -0700
From:	Joe Perches <joe@...ches.com>
To:	Mateusz Kulikowski <mateusz.kulikowski@...il.com>
Cc:	gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/5] staging: rtl8192e: fix coding style errors
 (macros in parentheses)

On Sun, 2015-03-15 at 21:39 +0100, Mateusz Kulikowski wrote:
> Fix checkpatch.pl errors 'Macros with complex values should be enclosed in parentheses'.
[]
> diff --git a/drivers/staging/rtl8192e/rtl819x_HT.h b/drivers/staging/rtl8192e/rtl819x_HT.h
[]
> @@ -78,7 +78,7 @@ enum chnl_op {
>  };
>  
>  #define CHHLOP_IN_PROGRESS(_pHTInfo)	\
> -		((_pHTInfo)->ChnlOp > CHNLOP_NONE) ? true : false
> +		(((_pHTInfo)->ChnlOp > CHNLOP_NONE) ? true : false)

This would perhaps be better without the ternary as
the compiler might not optimize the ternary away

#define CHHLOP_IN_PROGRESS(_pHTInfo)				\
	((_pHTInfo)->ChnOp > CHNLOP_NONE)

This would also probably be better as a static inline
not a macro, but as this is never used it's actually
better just to remove it.

> @@ -385,8 +385,8 @@ extern u8 MCS_FILTER_1SS[16];
>  #define	LEGACY_WIRELESS_MODE	IEEE_MODE_MASK
>  
>  #define CURRENT_RATE(WirelessMode, LegacyRate, HTRate)	\
> -			((WirelessMode & (LEGACY_WIRELESS_MODE)) != 0) ? \
> -			(LegacyRate) : (PICK_RATE(LegacyRate, HTRate))
> +			(((WirelessMode & (LEGACY_WIRELESS_MODE)) != 0) ? \
> +			(LegacyRate) : (PICK_RATE(LegacyRate, HTRate)))

This would be better with the various macro arguments
parenthesized (especially WirelessMode)

#define CURRENT_RATE(WirelessMode, LegacyRate, HTRate)		\
	(((WirelessMode) & LEGACY_WIRELESS_MODE)  ? 		\
	(LegacyRate) : PICK_RATE((LegacyRate), HTRate))

As this is used exactly once, it's probably better
expanded in that one place and the macro removed.

That's true for PICK_RATE as well.


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