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

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Message-ID: <alpine.DEB.2.20.1803292140340.2750@hadrien>
Date:   Thu, 29 Mar 2018 21:44:02 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Fabio Estevam <festevam@...il.com>
cc:     Francisco Jerez <currojerez@...eup.net>, 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>, Nicolai Stange <nstange@...e.de>
Subject: Re: [kbuild-all] [PATCH] OPTIONAL: cpufreq/intel_pstate: fix
 debugfs_simple_attr.cocci warnings



On Thu, 29 Mar 2018, Fabio Estevam wrote:

> 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?

I don't know.  I didn't write this rule.  Nicolai, can you explain?

thanks,
julia