linux-kernel - [PATCH] checkpatch: Improve TYPECAST_INT

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Message-ID: <ecefe8dcb93fe7028311b69dd297ba52224233d4.camel@perches.com>
Date:   Mon, 18 Jan 2021 09:19:18 -0800
From:   Joe Perches <joe@...ches.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     dgilbert@...erlog.com, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] checkpatch: Improve TYPECAST_INT_CONSTANT test message

Improve the TYPECAST_INT_CONSTANT test by showing the suggested
conversion for various type of uses like (unsigned int)1 to 1U.

Signed-off-by: Joe Perches <joe@...ches.com>
---

Douglas Gilbert sent me a private email (and in that email said he
'loves to hate checkpatch' ;) complaining that checkpatch warned on the
use of the cast of '(unsigned int)1' so make it more obvious why the
message is emitted by always showing the suggested conversion.

 scripts/checkpatch.pl | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 016115a62a9f..4f8494527139 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6527,18 +6527,18 @@ sub process {
 		if ($line =~ /(\(\s*$C90_int_types\s*\)\s*)($Constant)\b/) {
 			my $cast = $1;
 			my $const = $2;
+			my $suffix = "";
+			my $newconst = $const;
+			$newconst =~ s/${Int_type}$//;
+			$suffix .= 'U' if ($cast =~ /\bunsigned\b/);
+			if ($cast =~ /\blong\s+long\b/) {
+			    $suffix .= 'LL';
+			} elsif ($cast =~ /\blong\b/) {
+			    $suffix .= 'L';
+			}
 			if (WARN("TYPECAST_INT_CONSTANT",
-				 "Unnecessary typecast of c90 int constant\n" . $herecurr) &&
+				 "Unnecessary typecast of c90 int constant - '$cast$const' could be '$const$suffix'\n" . $herecurr) &&
 			    $fix) {
-				my $suffix = "";
-				my $newconst = $const;
-				$newconst =~ s/${Int_type}$//;
-				$suffix .= 'U' if ($cast =~ /\bunsigned\b/);
-				if ($cast =~ /\blong\s+long\b/) {
-					$suffix .= 'LL';
-				} elsif ($cast =~ /\blong\b/) {
-					$suffix .= 'L';
-				}
 				$fixed[$fixlinenr] =~ s/\Q$cast\E$const\b/$newconst$suffix/;
 			}
 		}