linux-kernel - Re: [PATCH v10] staging: fbtft: add tearing signal detect

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Message-ID: <2efe84eefdfd21da68d323a6e32b4ad84bc0fa6b.camel@perches.com>
Date:   Wed, 27 Jan 2021 10:21:30 -0800
From:   Joe Perches <joe@...ches.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     carlis <zhangxuezhi3@...il.com>,
        Andy Whitcroft <apw@...onical.com>, devel@...verdev.osuosl.org,
        linux-fbdev@...r.kernel.org, mh12gx2825@...il.com,
        oliver.graute@...oconnector.com, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, sbrivio@...hat.com,
        colin.king@...onical.com, zhangxuezhi1@...ong.com
Subject: Re: [PATCH v10] staging: fbtft: add tearing signal detect

> Comments are the exception to the "no spaces at the start of a line"
> rule.  I was expecting that the kbuild-bot would send a Smatch warning
> for inconsistent indenting, but comments are not counted there either.
> 
> I'm sort of surprised that we don't have checkpatch rule about the
> missing space characters.  It should be: "/* Tearing Effect Line On */".

Maybe this but the "preceded by a tab" test is pretty noisy.

---
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 4f8494527139..72347e82d384 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3720,6 +3720,22 @@ sub process {
 				    s/(\(\s*$Type\s*\))[ \t]+/$1/;
 			}
 		}
+
+# Comment styles
+# Initial comment only lines that have a leading space
+		if ($rawline =~ m{^\+([ \t]+)(?:/\*|//)} && $1 =~ / /) {
+			WARN("COMMENT_STYLE",
+			     "Initial comment lines should be indented only with tabs\n" . $herecurr);
+# comments not aligned on tabs
+		} elsif ($rawline !~ m{^\+(?:/\*|//)} &&
+			 $rawline =~ m{^\+.*[^\t](?:/\*|//)}) {
+			CHK("COMMENT_STYLE",
+			    "Comments should generally be preceded by a tab\n" . $herecurr);
+		}
+
+# comment initiators should generally be followed by a space if using words
+		if ($rawline =~ m{^\+.*(?:/\*|//)\w}) {
+			WARN("COMMENT_STYLE",
+			     "Comment text should use a space after the comment initiator\n" . $herecurr);
+		}
 
 # Block comment styles
 # Networking with an initial /*