linux-kernel - Re: [PATCH v2 2/3] checkpatch: check for _

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Date:	Sun, 10 Jan 2016 07:08:39 -0800
From:	Joe Perches <joe@...ches.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org
Cc:	Andy Whitcroft <apw@...onical.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	virtualization@...ts.linux-foundation.org,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	David Miller <davem@...emloft.net>, linux-ia64@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-metag@...r.kernel.org, linux-mips@...ux-mips.org,
	x86@...nel.org, user-mode-linux-devel@...ts.sourceforge.net,
	adi-buildroot-devel@...ts.sourceforge.net,
	linux-sh@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
	xen-devel@...ts.xenproject.org, Ingo Molnar <mingo@...nel.org>,
	Tony Lindgren <tony@...mide.com>,
	Andrey Konovalov <andreyknvl@...gle.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Subject: Re: [PATCH v2 2/3] checkpatch: check for __smp outside barrier.h

On Sun, 2016-01-10 at 13:57 +0200, Michael S. Tsirkin wrote:
> Introduction of __smp barriers cleans up a bunch of duplicate code, but
> it gives people an additional handle onto a "new" set of barriers - just
> because they're prefixed with __* unfortunately doesn't stop anyone from
> using it (as happened with other arch stuff before.)
> 
> Add a checkpatch test so it will trigger a warning.
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -5141,6 +5141,16 @@ sub process {
>  			}
>  		}
>  
> +		my $underscore_smp_barriers = qr{__smp_($smp_barriers)}x;

another unnecessary capture group

> +
> +		if ($realfile !~ m@...clude/asm-generic/@ &&
> +		    $realfile !~ m@...rrier\.h$@ &&
> +		    $line =~ m/\b($underscore_smp_barriers)\s*\(/ &&
> +		    $line !~ m/^.\s*\#\s*define\s+($underscore_smp_barriers)\s*\(/) {
> +			WARN("MEMORY_BARRIER",
> +			     "__smp memory barriers shouldn't be used outside barrier.h and asm-generic\n" . $herecurr);
> +		}
> +
>  # check for waitqueue_active without a comment.
>  		if ($line =~ /\bwaitqueue_active\s*\(/) {
>  			if (!ctx_has_comment($first_line, $linenr)) {