From 95e2c6023b0e4c8499fb521697f79215f69135fe Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Wed, 3 Jul 2013 15:05:20 -0700 Subject: [PATCH] checkpatch: warn when using gcc's binary constant ("0b") extension The gcc extension for binary constants that start with 0b is only supported with gcc version 4.3 or higher. The kernel can still be compiled with earlier versions of gcc, so have checkpatch emit a warning for these constants. Restructure checkpatch's constant finding code a bit to support finding these binary constants. Signed-off-by: Joe Perches Suggested-by: Andrew Morton Cc: Andy Whitcroft Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- scripts/checkpatch.pl | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index f1aad19b475c..517da26d9a2d 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -230,11 +230,15 @@ our $Inline = qr{inline|__always_inline|noinline}; our $Member = qr{->$Ident|\.$Ident|\[[^]]*\]}; our $Lval = qr{$Ident(?:$Member)*}; +our $Int_type = qr{(?i)llu|ull|ll|lu|ul|l|u}; +our $Binary = qr{(?i)0b[01]+$Int_type?}; +our $Hex = qr{(?i)0x[0-9a-f]+$Int_type?}; +our $Int = qr{[0-9]+$Int_type?}; our $Float_hex = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?}; our $Float_dec = qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?}; our $Float_int = qr{(?i)[0-9]+e-?[0-9]+[fl]?}; our $Float = qr{$Float_hex|$Float_dec|$Float_int}; -our $Constant = qr{$Float|(?i)(?:0x[0-9a-f]+|[0-9]+)[ul]*}; +our $Constant = qr{$Float|$Binary|$Hex|$Int}; our $Assignment = qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=}; our $Compare = qr{<=|>=|==|!=|<|>}; our $Operators = qr{ @@ -2934,9 +2938,17 @@ sub process { } } -#CamelCase +#Specific variable tests while ($line =~ m{($Constant|$Lval)}g) { my $var = $1; + +#gcc binary extension + if ($var =~ /^$Binary$/) { + WARN("GCC_BINARY_CONSTANT", + "Avoid gcc v4.3+ binary constant extension: <$var>\n" . $herecurr); + } + +#CamelCase if ($var !~ /$Constant/ && $var =~ /[A-Z][a-z]|[a-z][A-Z]/ && $var !~ /"^(?:Clear|Set|TestClear|TestSet|)Page[A-Z]/ &&