linux-kernel - Re: [PATCH][ppc] logical/bitand typo in powerpc/boot/4xx.c

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Date:	Tue, 29 Jan 2008 14:34:10 +0100
From:	Roel Kluin <12o3l@...cali.nl>
To:	Andy Whitcroft <apw@...dowen.org>
CC:	Joe Perches <joe@...ches.com>, jwboyer@...ux.vnet.ibm.com,
	lkml <linux-kernel@...r.kernel.org>, linuxppc-dev@...abs.org
Subject: Re: [PATCH][ppc] logical/bitand typo in powerpc/boot/4xx.c

>>> On Wed, 2008-01-23 at 23:37 +0100, Roel Kluin wrote:
>>>> -		if (val && 0x1)
>>>> +		if (val & 0x1)

>> Joe Perches wrote:
>>> I think this pattern should be added to checkpatch
>>> +		if ($line =~ /\&\&\s*0[xX]/) {

> On Thu, Jan 24, 2008 at 01:18:48AM +0100, Roel Kluin wrote:
>> I agree but there will be false positives, i'd propose to change that to
>> +		if ($line =~ /(?:(?:\(|\&\&|\|\|)\s*0[xX]\s*(?:&&|\|\|)|
>> +				(?:\&\&|\|\|)\s*0[xX]\s*(?:\)|&&|\|\|))/) {

Andy Whitcroft wrote:
> That one doesn't even match the original example.  Seems to be missing
> some number matching.  The concept seems sound though.  Basically
> looking for numbers which are definatly adjacent to a boolean or a brace
> on both sides.

You are right. here's a version that does work. It works the same as
git-grep -E "((\(|&&|\|\|)[[:space:]]*(0[xX][0-9a-fA-F]+|[0-9]+)[[:space:]]*(&&|\|\|)|(&&|\|\|)[[:space:]]*(0[xX][0-9a-fA-F]+|[0-9]+)[[:space:]]*(\)|&&|\|\|))"

---
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 579f50f..62276f7 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1337,6 +1337,11 @@ sub process {
 			}
 		}
 
+# Check for bitwise tests written as boolean
+		if ($line =~ /((\(|&&|\|\|)\s*(0[xX][0-9a-fA-F]+|[0-9]+)\s*(&&|\|\|)|(&&|\|\|)\s*(0[xX][0-9a-fA-F]+|[0-9]+)\s*(\)|&&|\|\|))/) {
+			WARN("boolean test with hexadecimal, perhaps just \'&\' or \'|\'?\n" . $herecurr);
+		}
+
 # if and else should not have general statements after it
 		if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/ &&
 		    $1 !~ /^\s*(?:\sif|{|\\|$)/) {

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