linux-kernel - Re: [net-next PATCH v5 04/15] leds: Provide stubs for when CLASS

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Message-ID: <6419c60e.df0a0220.1949a.c432@mx.google.com>
Date:   Tue, 21 Mar 2023 08:55:14 +0100
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
        John Crispin <john@...ozen.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [net-next PATCH v5 04/15] leds: Provide stubs for when CLASS_LED
 is disabled

On Mon, Mar 20, 2023 at 08:31:36PM +0100, Andrew Lunn wrote:
> On Mon, Mar 20, 2023 at 06:52:47PM +0100, Christian Marangi wrote:
> > On Sun, Mar 19, 2023 at 11:49:02PM +0100, Andrew Lunn wrote:
> > > > +#if IS_ENABLED(CONFIG_LEDS_CLASS)
> > > >  enum led_default_state led_init_default_state_get(struct fwnode_handle *fwnode);
> > > > +#else
> > > > +static inline enum led_default_state
> > > > +led_init_default_state_get(struct fwnode_handle *fwnode)
> > > > +{
> > > > +	return LEDS_DEFSTATE_OFF;
> > > > +}
> > > > +#endif
> > > 
> > > 0-day is telling me i have this wrong. The function is in led-core.c,
> > > so this should be CONFIG_NEW_LEDS, not CONFIG_LEDS_CLASS.
> > > 
> > 
> > Any idea why? NEW_LEDS just enable LEDS_CLASS selection so why we need
> > to use that? Should not make a difference (in theory)
> 
> 0-day came up with a configuration which resulted in NEW_LEDS enabled
> but LEDS_CLASS disabled. That then resulted in multiple definitions of 
> led_init_default_state_get() when linking.
> 
> I _guess_ this is because select is used, which is not mandatory. So
> randconfig can turn off something which is enabled by select.
> 
> I updated my tree, and so far 0-day has not complained, but it can
> take a few days when it is busy.
> 

BTW yes I repro the problem.

Checked the makefile and led-core.c is compiled with NEW_LEDS and
led-class is compiled with LEDS_CLASS.

led_init_default_state_get is in led-core.c and this is the problem with
using LEDS_CLASS instead of NEW_LEDS...

But actually why we are putting led_init_default_state_get behind a
config? IMHO we should compile it anyway.

So my suggestion is to keep the LEDS_CLASS and just remove the part for 
led_init_default_state_get.

Also why IS_ENABLED instead of a simple ifdef? (in leds.h there is a mix
of both so I wonder if we should use one or the other)

-- 
	Ansuel