+ checkpatch-warn-when-casting-constants-to-c90-int-or-longer-types.patch added to -mm tree

+ checkpatch-warn-when-casting-constants-to-c90-int-or-longer-types.patch added to -mm tree

[akpm]

The patch titled
     Subject: checkpatch: warn when casting constants to c90 int or longer types
has been added to the -mm tree.  Its filename is
     checkpatch-warn-when-casting-constants-to-c90-int-or-longer-types.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/checkpatch-warn-when-casting-constants-to-c90-int-or-longer-types.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/checkpatch-warn-when-casting-constants-to-c90-int-or-longer-types.patch

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*** Remember to use Documentation/SubmitChecklist when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Joe Perches <joe@perches.com>
Subject: checkpatch: warn when casting constants to c90 int or longer types

Linus Torvalds wrote:

> I can't but help to react that this:
>  #define IOMMU_ERROR_CODE       (~(unsigned long) 0)
> Not that this *matters*, but it's a bit odd to have to cast constants
> to perfectly regular C types.

So add a test that looks for constants that are cast to
standard C90 int or longer types and suggest using C90
"6.4.4.1 Integer constants" integer-suffixes instead.

Miscellanea:

o Add a --fix option too

Signed-off-by: Joe Perches <joe@perches.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 scripts/checkpatch.pl |   42 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff -puN scripts/checkpatch.pl~checkpatch-warn-when-casting-constants-to-c90-int-or-longer-types scripts/checkpatch.pl
--- a/scripts/checkpatch.pl~checkpatch-warn-when-casting-constants-to-c90-int-or-longer-types
+++ a/scripts/checkpatch.pl
@@ -433,6 +433,28 @@ our @typeList = (
 	qr{${Ident}_handler_fn},
 	@typeListMisordered,
 );
+
+our $C90_int_types = qr{(?x:
+	long\s+long\s+int\s+(?:un)?signed|
+	long\s+long\s+(?:un)?signed\s+int|
+	long\s+long\s+(?:un)?signed|
+	(?:(?:un)?signed\s+)?long\s+long\s+int|
+	(?:(?:un)?signed\s+)?long\s+long|
+	int\s+long\s+long\s+(?:un)?signed|
+	int\s+(?:(?:un)?signed\s+)?long\s+long|
+
+	long\s+int\s+(?:un)?signed|
+	long\s+(?:un)?signed\s+int|
+	long\s+(?:un)?signed|
+	(?:(?:un)?signed\s+)?long\s+int|
+	(?:(?:un)?signed\s+)?long|
+	int\s+long\s+(?:un)?signed|
+	int\s+(?:(?:un)?signed\s+)?long|
+
+	int\s+(?:un)?signed|
+	(?:(?:un)?signed\s+)?int
+)};
+
 our @typeListFile = ();
 our @typeListWithAttr = (
 	@typeList,
@@ -5241,6 +5263,26 @@ sub process {
 			}
 		}
 
+# check for cast of C90 native int or longer types constants
+		if ($line =~ /(\(\s*$C90_int_types\s*\)\s*)($Constant)\b/) {
+			my $cast = $1;
+			my $const = $2;
+			if (WARN("TYPECAST_INT_CONSTANT",
+				 "Unnecessary typecast of c90 int constant\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/;
+			}
+		}
+
 # check for sizeof(&)
 		if ($line =~ /\bsizeof\s*\(\s*\&/) {
 			WARN("SIZEOF_ADDRESS",
_

Patches currently in -mm which might be from joe@perches.com are

checkpatch-warn-when-casting-constants-to-c90-int-or-longer-types.patch