linux-kernel - Re: [PATCH 3/4] mfd: intel_quark_i2c

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Date: Wed, 24 Apr 2024 15:37:30 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>
Cc: linux-kernel@...r.kernel.org, 
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
	Mika Westerberg <mika.westerberg@...ux.intel.com>, Jan Dabros <jsd@...ihalf.com>, 
	Andi Shyti <andi.shyti@...nel.org>, Lee Jones <lee@...nel.org>, 
	Jiawen Wu <jiawenwu@...stnetic.com>, Mengyuan Lou <mengyuanlou@...-swift.com>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Maciej Fijalkowski <maciej.fijalkowski@...el.com>, Andrew Lunn <andrew@...n.ch>, 
	Duanqiang Wen <duanqiangwen@...-swift.com>, 
	"open list:SYNOPSYS DESIGNWARE I2C DRIVER" <linux-i2c@...r.kernel.org>, 
	"open list:WANGXUN ETHERNET DRIVER" <netdev@...r.kernel.org>
Subject: Re: [PATCH 3/4] mfd: intel_quark_i2c_gpio: Utilize i2c-designware.h

On Wed, Apr 24, 2024 at 4:28 AM Florian Fainelli
<florian.fainelli@...adcom.com> wrote:
> On 4/23/2024 5:01 PM, Andy Shevchenko wrote:
> > Tue, Apr 23, 2024 at 04:36:21PM -0700, Florian Fainelli kirjoitti:
> >> Rather than open code the i2c_designware string, utilize the newly
> >> defined constant in i2c-designware.h.

..

> >> -#define INTEL_QUARK_I2C_CONTROLLER_CLK "i2c_designware.0"
> >> +#define INTEL_QUARK_I2C_CONTROLLER_CLK I2C_DESIGNWARE_NAME ".0"
> >
> > So, if you build a module separately for older version of the kernel (assuming
> > it allows you to modprobe), this won't work anymore.
>
> Sorry not following, was that comment supposed to be for patch #1 where
> I changed the i2c-designware-pci to i2c_designware-pci? modprobe
> recognizes both - and _ as interchangeable BTW.

I'm talking about something different. Let's assume you have a running
kernel (w.o. signature or version requirement for the modules), then
you have a new patch on top of it and then for an unknown reason you
changed. e.g., designware to DW in that definition. The newly built
module may not be loaded on the running kernel. Also note, here is the
instance name and not an ID in use. The replacement is wrong
semantically.

-- 
With Best Regards,
Andy Shevchenko