linux-kernel - Re: [PATCH v3 2/8] MAINTAINERS: Add entry for devm helpers

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Date:   Wed, 21 Apr 2021 12:54:29 +0000
From:   "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
To:     "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "sre@...nel.org" <sre@...nel.org>,
        "jdelvare@...e.com" <jdelvare@...e.com>,
        "mgross@...ux.intel.com" <mgross@...ux.intel.com>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "wens@...e.org" <wens@...e.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "agross@...nel.org" <agross@...nel.org>,
        "cw00.choi@...sung.com" <cw00.choi@...sung.com>,
        "broonie@...nel.org" <broonie@...nel.org>
Subject: Re: [PATCH v3 2/8] MAINTAINERS: Add entry for devm helpers

On Wed, 2021-04-21 at 14:26 +0200, Hans de Goede wrote:
> Hi,
> 
> On 4/21/21 2:17 PM, Vaittinen, Matti wrote:
> > On Wed, 2021-04-21 at 13:58 +0200, Hans de Goede wrote:
> > > Hi,
> > > 
> > > On 4/21/21 9:51 AM, Matti Vaittinen wrote:
> > > > On Tue, 2021-03-23 at 15:19 +0100, Greg KH wrote:
> > > > > On Tue, Mar 23, 2021 at 02:58:28PM +0100, Hans de Goede
> > > > > wrote:
> > > > > > Hi,
> > > > > > 
> > > > > > On 3/23/21 2:56 PM, Matti Vaittinen wrote:
> > > > > > > Devm helper header containing small inline helpers was
> > > > > > > added.
> > > > > > > Hans promised to maintain it.
> > > > > > > 
> > > > > > > Add Hans as maintainer and myself as designated reviewer.
> > > > > > > 
> > > > > > Ultimately this is up to Greg though, so lets wait and see
> > > > > > what
> > > > > > Greg has to say about this.
> > > > > 
> > > > > Can we move some of the devm_* calls in include/device.h into
> > > > > here as
> > > > > well so that you all can be in charge of them instead of me?

...

> > but what comes to my (not always so humble) opinion - most of
> > the devm functions in device.h are tightly related to the device
> > interface or devres. Thus the device.h feels like appropriate place
> > for
> > most of those.
> 
> I agree with you that most devm_ functions in device.h are probably
> left there. Moving them will also mean modifying all the drivers
> which use them to include the new devm-helpers.h include file
> which seems like needless churn.
> 
> > OTOH, the kmalloc/kfree related functions, strdub and
> > kmemdub might be candidates for move - those are not really "device
> > things".
> 
> I'm certainly open to moving some functions to devm-helpers.h, but
> also see above about needless churn.

I agree. Whether the move is worth all the hassle depends on how much
Greg _really_ wishes to get rid of those devm functions. Especially the
allocs are used _a lot_.

Best Regards
	--Matti