linux-kernel - Re: [PATCH v2 7/7] checkpatch: suggest _BITULL() and

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Message-ID: <9d8659fc8bc0729dd255c20234fb1a4210847ce9.camel@perches.com>
Date:   Fri, 21 May 2021 07:45:23 -0700
From:   Joe Perches <joe@...ches.com>
To:     Joe Richey <joerichey94@...il.com>, trivial@...nel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Joe Richey <joerichey@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Zhangfei Gao <zhangfei.gao@...aro.org>,
        Zhou Wang <wangzhou1@...ilicon.com>,
        Andy Whitcroft <apw@...onical.com>,
        Dwaipayan Ray <dwaipayanray1@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Sasha Levin <sashal@...nel.org>,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Andi Kleen <ak@...ux.intel.com>, Peter Xu <peterx@...hat.com>,
        Lei Cao <lei.cao@...atus.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Zaibo Xu <xuzaibo@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-accelerators@...ts.ozlabs.org
Subject: Re: [PATCH v2 7/7] checkpatch: suggest _BITULL() and _BITUL() for
 UAPI headers

On Fri, 2021-05-21 at 01:58 -0700, Joe Richey wrote:
> From: Joe Richey <joerichey@...gle.com>
> 
> Instead of just ignoring UAPI headers, reccomend the UAPI compatible
> macros if a user adds something that looks like (1 << n). Normal kernel
> code will continue to get BIT_ULL() and BIT() reccomended.
> 
> This change also modifies the $realfile regex to match headers that have
> "include/uapi" anywhere in their path so paths like:
>     tools/include/uapi/linux/kvm.h
>     arch/x86/include/uapi/asm/hwcap2.h
> get recognized as UAPI headers.
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -7020,15 +7020,17 @@ sub process {
>  			}
>  		}
>  
> 
> -# check for #defines like: 1 << <digit> that could be BIT(digit), it is not exported to uapi
> -		if ($realfile !~ m@...clude/uapi/@ &&
> -		    $line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
> -			my $ull = "";
> -			$ull = "_ULL" if (defined($1) && $1 =~ /ll/i);
> +# check for #defines like: 1 << <digit> that could be BIT(digit) or similar
> +		if ($line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
> +			my $ull = (defined($1) && $1 =~ /ll/i);
> +			my $macroname = $ull ? "BIT_ULL" : "BIT";
> +			if ($realfile =~ m@...lude/uapi/@) {

Likely better with \b
			if ($realfile =~ m@\binclude/uapi/@) {

> +				$macroname = $ull ? "_BITULL" : "_BITUL";
> +			}
>  			if (CHK("BIT_MACRO",
> -				"Prefer using the BIT$ull macro\n" . $herecurr) &&
> +				"Prefer using the $macroname macro\n" . $herecurr) &&
>  			    $fix) {
> -				$fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/BIT${ull}($1)/;
> +				$fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/${macroname}($1)/;

Doesn't need braces
				$fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/$macroname($1)/;

Otherwise, fine by me.