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From:   Francisco Jerez <currojerez@riseup.net>
To:     Fabio Estevam <festevam@gmail.com>,
        Julia Lawall <julia.lawall@lip6.fr>
Cc:     linux-pm@vger.kernel.org, Viresh Kumar <viresh.kumar@linaro.org>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        linux-kernel <linux-kernel@vger.kernel.org>, kbuild-all@01.org,
        Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
        0day robot <fengguang.wu@intel.com>,
        Len Brown <lenb@kernel.org>
Subject: Re: [kbuild-all] [PATCH] OPTIONAL: cpufreq/intel_pstate: fix debugfs_simple_attr.cocci warnings
In-Reply-To: <CAOMZO5CLpW+2yCYRwAJTPWtXgXkaPGyPQrB3cbBGYvV1fryUQw@mail.gmail.com>
References: <alpine.DEB.2.20.1803292109180.2750@hadrien> <CAOMZO5CLpW+2yCYRwAJTPWtXgXkaPGyPQrB3cbBGYvV1fryUQw@mail.gmail.com>
Date:   Thu, 29 Mar 2018 12:23:10 -0700
Message-ID: <87a7uqofdt.fsf@riseup.net>
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Fabio Estevam <festevam@gmail.com> writes:

> Hi Julia,
>
> On Thu, Mar 29, 2018 at 4:12 PM, Julia Lawall <julia.lawall@lip6.fr> wrote:
>>  Use DEFINE_DEBUGFS_ATTRIBUTE rather than DEFINE_SIMPLE_ATTRIBUTE
>>  for debugfs files.
>>
>> Semantic patch information:
>>  Rationale: DEFINE_SIMPLE_ATTRIBUTE + debugfs_create_file()
>>  imposes some significant overhead as compared to
>>  DEFINE_DEBUGFS_ATTRIBUTE + debugfs_create_file_unsafe().
>
> Just curious: could you please expand on what "imposes some
> significant overhead" means?
>

Probably negligible given that this code will only be run once at system
boot and then never used again in production systems.  But I guess the
micro-optimization doesn't hurt either.

> Thanks

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