From: Greg KH <gregkh@linuxfoundation.org>
To: Aishwarya Ramakrishnan <aishwaryarj100@gmail.com>
Cc: "Dmitry Torokhov" <dmitry.torokhov@gmail.com>,
"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
"Marco Felsch" <m.felsch@pengutronix.de>,
"Ondrej Jirman" <megous@megous.com>,
"Mylène Josserand" <mylene.josserand@bootlin.com>,
"Philipp Zabel" <p.zabel@pengutronix.de>,
linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Input: edt-ft5x06: Use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops
Date: Wed, 6 May 2020 17:22:18 +0200 [thread overview]
Message-ID: <20200506152218.GA3447721@kroah.com> (raw)
In-Reply-To: <20200506150623.3841-1-raishwar@visteon.com>
On Wed, May 06, 2020 at 08:36:22PM +0530, Aishwarya Ramakrishnan wrote:
> From: Aishwarya Ramakrishnan <aishwaryarj100@gmail.com>
>
> On Tue, May 5, 2020 at 11:49 PM Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote:
> > On Tue, May 05, 2020 at 09:03:24PM +0530, Aishwarya Ramakrishnan wrote:
> >> It is more clear to use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs file
> >> operation rather than DEFINE_SIMPLE_ATTRIBUTE.
>
> > No it is not, why do you think so?
>
> This change is suggested by Coccinelle software.
> Generated by: scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci
Not a good thing, I do not know why that was added :(
> > The two defines do different things, that is why we have 2 different
> > defines. You can not just replace one with the other without
> > understanding why one was used and not the other one.
>
> > Did you test this change to verify that everything still works
> > properly? Why is it needed to be changed at all?
>
> DEFINE_SIMPLE_ATTRIBUTE + debugfs_create_file()
> imposes some significant overhead as compared to
> DEFINE_DEBUGFS_ATTRIBUTE + debugfs_create_file_unsafe().
What kind of overhead? Is it required?
> But I missed to use debugfs_create_file_unsafe() function in the patch.
Yeah, don't use the unsafe stuff unless you know what is happening here
please.
greg k-h
prev parent reply other threads:[~2020-05-06 15:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-05 15:33 [PATCH] Input: edt-ft5x06: Use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops Aishwarya Ramakrishnan
2020-05-05 18:19 ` Greg Kroah-Hartman
2020-05-06 15:06 ` Aishwarya Ramakrishnan
2020-05-06 15:22 ` Greg KH [this message]
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