linux-kernel - Re: checkpatch: CHECK: No space is necessary after a cast

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Date:	Mon, 29 Sep 2014 11:02:35 -0700
From:	Joe Perches <joe@...ches.com>
To:	Kalle Valo <kvalo@....qualcomm.com>
Cc:	ath10k@...ts.infradead.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dan Carpenter <error27@...il.com>
Subject: Re: checkpatch: CHECK: No space is necessary after a cast

On Mon, 2014-09-29 at 14:49 +0300, Kalle Valo wrote:
> Hi Joe,
> 
> I have a problem with checkpatch. On ath10k we have this function:
> 
> static inline struct ath10k_skb_cb *ATH10K_SKB_CB(struct sk_buff *skb)
> {
> 	BUILD_BUG_ON(sizeof(struct ath10k_skb_cb) >
> 		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE);
> 	return (struct ath10k_skb_cb *)&IEEE80211_SKB_CB(skb)->driver_data;
> }
> 
> And the BUILD_BUG_ON triggers this warning:
> 
> drivers/net/wireless/ath/ath10k/core.h:85: CHECK: No space is necessary after a cast
> 
> Any advice how to handle that?

It's a checkpatch false positive that could be fixed.

It needs something like another test to look for
sizeof(type) as not a cast and more arithmetic/comparison
uses.

Maybe you can test this?
---
 scripts/checkpatch.pl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 52a223e..6132329 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2515,7 +2515,8 @@ sub process {
 			}
 		}
 
-		if ($line =~ /^\+.*\(\s*$Type\s*\)[ \t]+(?!$Assignment|$Arithmetic|{)/) {
+		if ($line =~ /^\+.*(\w+\s*)?\(\s*$Type\s*\)[ \t]+(?!$Assignment|$Arithmetic|[,;\({\[\<\>])/ &&
+		    (!defined($1) || $1 !~ /sizeof\s*/)) {
 			if (CHK("SPACING",
 				"No space is necessary after a cast\n" . $herecurr) &&
 			    $fix) {


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