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Subject: Re: [PATCH v3 01/11] checkpatch: check for nested (un)?likely() calls
To:     Denis Efremov <efremov@linux.com>, Joe Perches <joe@perches.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Anton Altaparmakov <anton@tuxera.com>,
        Andy Whitcroft <apw@canonical.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Boris Pismenny <borisp@mellanox.com>,
        "Darrick J. Wong" <darrick.wong@oracle.com>,
        "David S. Miller" <davem@davemloft.net>,
        Dennis Dalessandro <dennis.dalessandro@intel.com>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        dri-devel@lists.freedesktop.org,
        Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>,
        =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= <jgross@suse.com>,
        Leon Romanovsky <leon@kernel.org>,
        linux-arm-msm@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-ntfs-dev@lists.sourceforge.net, linux-rdma@vger.kernel.org,
        linux-wimax@intel.com, linux-xfs@vger.kernel.org,
        Mike Marciniszyn <mike.marciniszyn@intel.com>,
        netdev@vger.kernel.org,
        =?UTF-8?Q?Pali_Roh=c3=a1r?= <pali.rohar@gmail.com>,
        Rob Clark <robdclark@gmail.com>,
        Saeed Mahameed <saeedm@mellanox.com>,
        Sean Paul <sean@poorly.run>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        xen-devel@lists.xenproject.org, Enrico Weigelt <lkml@metux.net>
References: <20190829165025.15750-1-efremov@linux.com>
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From:   Markus Elfring <Markus.Elfring@web.de>
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Date:   Sat, 31 Aug 2019 19:26:41 +0200
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>>>>> +# nested likely/unlikely calls
>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if ($line =3D~ /\b(?:(?:=
un)?likely)\s*\(\s*!?\s*(IS_ERR(?:_OR_NULL|_VALUE)?|WARN)/) {
>>>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
WARN("LIKELY_MISUSE",
=E2=80=A6
>> \b(?:un)?likely\s*
>
> This pair of brackets is required to match "unlikely"
> and it's optional in order to match "likely".

I agree also to this view if you refer to the shortened regular expression=
 here.
But I got an other development opinion for an extra pair of non-capturing =
parentheses
at the front (from the version which you suggested).

Regards,
Markus