checkpatch: add support for floating point constants

Even though the kernel doesn't support using floating point constants,
add a regex for them.

Support forms like: 0x123p1, 123e-1, 1.23, 1.5e23f

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 8cb9bfc7c14f..9de3a69260e1 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -230,7 +230,11 @@ our $Inline	= qr{inline|__always_inline|noinline};
 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 our $Lval       = qr{$Ident(?:$Member)*};
 
-our $Constant   = qr{(?i:(?:0x[0-9a-f]+|[0-9]+)[ul]*)};
+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 $Assignment = qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
 our $Compare    = qr{<=|>=|==|!=|<|>};
 our $Operators  = qr{