linux-kernel - Re: [PATCH] checkpatch: Add --strict preference for #defines using BIT(foo)

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Message-ID: <20141109095025.GA1840@nanopsycho.orion>
Date:	Sun, 9 Nov 2014 10:50:25 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Joe Perches <joe@...ches.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] checkpatch: Add --strict preference for #defines using
 BIT(foo)

Fri, Nov 07, 2014 at 10:15:39PM CET, joe@...ches.com wrote:
>Using BIT(foo) and BIT_ULL(bar) is more common now.
>Suggest using these macros over #defines with 1<<value.

Joe, regarding the other Dave's comment, the multiline one, that is also
not covered by checkpatch. Would please you take care of that as well?

Thanks.

>
>Add a --fix option too.
>
>Signed-off-by: Joe Perches <joe@...ches.com>
>---
> scripts/checkpatch.pl | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
>diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
>index 893cbd5..b5dc3f4 100755
>--- a/scripts/checkpatch.pl
>+++ b/scripts/checkpatch.pl
>@@ -4973,6 +4973,17 @@ sub process {
> 			}
> 		}
> 
>+# check for #defines like: 1 << <digit> that could be BIT(digit)
>+		if ($line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
>+			my $ull = "";
>+			$ull = "_ULL" if (defined($1) && $1 =~ /ll/i);
>+			if (CHK("BIT_MACRO",
>+				"Prefer using the BIT$ull macro\n" . $herecurr) &&
>+			    $fix) {
>+				$fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/BIT${ull}($1)/;
>+			}
>+		}
>+
> # check for case / default statements not preceded by break/fallthrough/switch
> 		if ($line =~ /^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {
> 			my $has_break = 0;
>
>
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