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| author | Joe Perches <joe@perches.com> | 2016-01-20 23:59:15 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-21 02:09:18 +0100 |
| commit | 938224b5e596c1c30d968ffd927a578ea7c4f45b (patch) | |
| tree | 8d2ae9d42c9bc887f0dc984979d2e7c01ecf990d | |
| parent | lib/clz_tab.c: put in lib-y rather than obj-y (diff) | |
| download | linux-938224b5e596c1c30d968ffd927a578ea7c4f45b.tar.xz linux-938224b5e596c1c30d968ffd927a578ea7c4f45b.zip | |
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>
| -rwxr-xr-x | scripts/checkpatch.pl | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index c7bf1aa2eeb3..86457062db29 100755 --- 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", |