linux-kernel - Re: [kbuild-all] [PATCH] OPTIONAL: cpufreq/intel_pstate: fix debugfs_simple

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Date:   Thu, 29 Mar 2018 12:23:10 -0700
From:   Francisco Jerez <currojerez@...eup.net>
To:     Fabio Estevam <festevam@...il.com>,
        Julia Lawall <julia.lawall@...6.fr>
Cc:     linux-pm@...r.kernel.org, Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-kernel <linux-kernel@...r.kernel.org>, kbuild-all@...org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        0day robot <fengguang.wu@...el.com>,
        Len Brown <lenb@...nel.org>
Subject: Re: [kbuild-all] [PATCH] OPTIONAL: cpufreq/intel_pstate: fix debugfs_simple_attr.cocci warnings

Fabio Estevam <festevam@...il.com> writes:

> Hi Julia,
>
> On Thu, Mar 29, 2018 at 4:12 PM, Julia Lawall <julia.lawall@...6.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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