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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c7bf1aa..8645706 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/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,
@@ -5272,6 +5294,26 @@ 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",