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Message-ID: <Y49M++waEHLm0hEA@lunn.ch>
Date: Tue, 6 Dec 2022 15:08:59 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Divya.Koppera@...rochip.com
Cc: hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
richardcochran@...il.com, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v5 net-next 2/2] net: phy: micrel: Fix warn: passing zero
to PTR_ERR
> > > - if (!IS_ENABLED(CONFIG_PTP_1588_CLOCK) ||
> > > - !IS_ENABLED(CONFIG_NETWORK_PHY_TIMESTAMPING))
> > > - return 0;
> > > -
> >
> > Why are you removing this ?
> >
>
> I got review comment from Richard in v2 as below, making it as consistent by checking ptp_clock. So removed it in next revision.
>
> " > static int lan8814_ptp_probe_once(struct phy_device *phydev)
> > {
> > struct lan8814_shared_priv *shared = phydev->shared->priv;
> >
> > if (!IS_ENABLED(CONFIG_PTP_1588_CLOCK) ||
> > !IS_ENABLED(CONFIG_NETWORK_PHY_TIMESTAMPING))
> > return 0;
>
> It is weird to use macros here, but not before calling ptp_clock_register.
> Make it consistent by checking shared->ptp_clock instead.
> That is also better form."
O.K. If Richard said this fine.
Just out of interest, could you disassemble lan8814_ptp_probe_once()
when CONFIG_PTP_1588_CLOCK is disabled, with and without this check?
My guess is, when PTP is disabled, the mutex still gets initialised,
all the member of shared->ptp_clock_info are set. The optimise cannot
remove it. With the macro check, the function is empty. So you end up
with a slightly bigger text size.
Andrew
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