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Date: Sun, 10 Jan 2016 21:30:49 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Andy Whitcroft <apw@canonical.com>, Joe Perches <joe@perches.com>,
 Peter Zijlstra <peterz@infradead.org>, Arnd Bergmann <arnd@arndb.de>,
 linux-arch@vger.kernel.org, Andrew Cooper <andrew.cooper3@citrix.com>,
 virtualization@lists.linux-foundation.org,
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 "H. Peter Anvin" <hpa@zytor.com>, David Miller <davem@davemloft.net>,
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 adi-buildroot-devel@lists.sourceforge.net, linux-sh@vger.kernel.org,
 linux-xtensa@linux-xtensa.org, xen-devel@lists.xenproject.org,
 Ingo Molnar <mingo@kernel.org>, Tony Lindgren <tony@atomide.com>,
 Andrey Konovalov <andreyknvl@google.com>,
 Russell King - ARM Linux <linux@arm.linux.org.uk>
Subject: [PATCH v3 2/3] checkpatch: check for __smp outside barrier.h
Message-ID: <1452454200-8844-3-git-send-email-mst@redhat.com>
References: <1452454200-8844-1-git-send-email-mst@redhat.com>
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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.

Reported-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 scripts/checkpatch.pl | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 1c01b7d..15cfca4 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5143,6 +5143,16 @@ sub process {
 			}
 		}
 
+		my $underscore_smp_barriers = qr{__smp_(?:$smp_barrier_stems)}x;
+
+		if ($realfile !~ m@^include/asm-generic/@ &&
+		    $realfile !~ m@/barrier\.h$@ &&
+		    $line =~ m/\b(?:$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)) {
-- 
MST