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
Suggested-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Joe Perches <j...@perches.com>
---
scripts/checkpatch.pl | 42 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 2d88cbf9..24cdeb0 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -431,6 +431,28 @@ our @typeList = (
qr{${Ident}_handler_fn},
@typeListMisordered,
);
+
+our $C90_int_types = qr{(?x:
+ long\s+long\s+int\s+(?:un)?signed|
+ long\s+long\s+(?:un)?signed\s+int|
+ long\s+long\s+(?:un)?signed|
+ (?:(?:un)?signed\s+)?long\s+long\s+int|
+ (?:(?:un)?signed\s+)?long\s+long|
+ int\s+long\s+long\s+(?:un)?signed|
+ int\s+(?:(?:un)?signed\s+)?long\s+long|
+
+ long\s+int\s+(?:un)?signed|
+ long\s+(?:un)?signed\s+int|
+ long\s+(?:un)?signed|
+ (?:(?:un)?signed\s+)?long\s+int|
+ (?:(?:un)?signed\s+)?long|
+ int\s+long\s+(?:un)?signed|
+ int\s+(?:(?:un)?signed\s+)?long|
+
+ int\s+(?:un)?signed|
+ (?:(?:un)?signed\s+)?int
+)};
+
our @typeListFile = ();
our @typeListWithAttr = (
@typeList,
@@ -5240,6 +5262,26 @@ sub process {
}
}
+# check for cast of C90 native int or longer types constants
+ if ($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",
--
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