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checkpatch: warn when using gcc's binary constant ("0b") extension

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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 <joe@perches.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joe Perches 2013-07-03 15:05:20 -07:00 committed by Linus Torvalds
parent be79794bc1
commit 95e2c6023b
1 changed files with 14 additions and 2 deletions
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16
scripts/checkpatch.pl
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@ -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]/ &&