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Subject: Re: [PATCH] usb: dwc3: make USB_DWC3_EXYNOS independent
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Guenter Roeck <linux@roeck-us.net>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        taehyun cho <taehyun.cho@samsung.com>, balbi@kernel.org,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
        Krzysztof Kozlowski <krzk@kernel.org>
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From:   Krzysztof Kozlowski <krzk@kernel.org>
Message-ID: <6e9d6831-f88e-477f-6256-7ab155bfa7ac@kernel.org>
Date:   Wed, 3 Mar 2021 16:46:22 +0100
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On 03/03/2021 16:09, Greg Kroah-Hartman wrote:
> On Wed, Mar 03, 2021 at 06:56:38AM -0800, Guenter Roeck wrote:
>> On 3/3/21 6:05 AM, Greg Kroah-Hartman wrote:
>> [ ... ]
>>>> Anyway, that's the convention or consensus so far for entire SoC. If we
>>>> want to change it - sure, but let's make it for everyone, not for just
>>>> this one USB driver.
>>>
>>> Great, let's change it for everyone, I don't see a need for ARCH_*
>>> symbols except for people who want to make it simpler for their one
>>> board type.  And for that, use a defconfig.
>>>
>>
>> I don't think that will work in practice. Many ARCH_ symbols for various
>> architectures contradict with each other. Almost all watchdog drivers
>> only _build_ for specific platforms/architectures.
> 
> Great, that's horrible to hear, so much for a "generic arm64 kernel
> binary" which I _thought_ was the goal.
> 
> ugh, you would have thought we would have learned our lesson with
> arm32...

I think Guenter here refers to drivers which actually came from arm32 
and were not cleaned up to be build without machine-specific bits 
(arch/arm/mach-xxx).

Most or all of the new code is made buildable outside of 
machine/ARCH_xxx (so COMPILE_TEST).

Best regards,
Krzysztof