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Subject: Re: [PATCH v5 6/7] misc: bcm-vk: add Broadcom VK driver
To:     Luis Chamberlain <mcgrof@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     David Brown <david.brown@linaro.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Shuah Khan <shuah@kernel.org>, bjorn.andersson@linaro.org,
        Shuah Khan <skhan@linuxfoundation.org>,
        Arnd Bergmann <arnd@arndb.de>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        linux-fsdevel@vger.kernel.org,
        BCM Kernel Feedback <bcm-kernel-feedback-list@broadcom.com>,
        Olof Johansson <olof@lixom.net>,
        Andrew Morton <akpm@linux-foundation.org>,
        Dan Carpenter <dan.carpenter@oracle.com>,
        Colin Ian King <colin.king@canonical.com>,
        Kees Cook <keescook@chromium.org>,
        Takashi Iwai <tiwai@suse.de>, linux-kselftest@vger.kernel.org,
        Andy Gross <agross@kernel.org>,
        Desmond Yan <desmond.yan@broadcom.com>,
        James Hu <james.hu@broadcom.com>
References: <20200508002739.19360-1-scott.branden@broadcom.com>
 <20200508002739.19360-7-scott.branden@broadcom.com>
 <20200513003830.GJ11244@42.do-not-panic.com>
 <60372b2f-c03d-6384-43a7-8b97413b6672@broadcom.com>
 <20200513065046.GA764247@kroah.com>
 <20200513123033.GL11244@42.do-not-panic.com>
From:   Scott Branden <scott.branden@broadcom.com>
Message-ID: <2eaa3047-4833-8d1c-d8c7-fc602468eae3@broadcom.com>
Date:   Wed, 13 May 2020 11:39:30 -0700
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Thanks for link.

On 2020-05-13 5:30 a.m., Luis Chamberlain wrote:
> On Wed, May 13, 2020 at 08:50:46AM +0200, Greg Kroah-Hartman wrote:
>> On Tue, May 12, 2020 at 11:31:28PM -0700, Scott Branden wrote:
>>
>> That's not how kernel drivers in the tree work, sorry.  They do not
>> contain "older kernel support" in them, they work as a whole with the
>> rest of the kernel they ship with only.
>>
>> Otherwise all drivers would be a total mess over time, can you imagine
>> doing this for the next 20+ years?  Not maintainable.
> Scott, now imagine the amount of cleanup you'd need to do to your driver
> to get it to a state where it doesn't depend on any old kernel. That's
> the exact shape of the driver we want.
>
> To backport, you can look into the backports project which strives to
> backport drivers automatically [0] to older kernels.
>
> [0] https://backports.wiki.kernel.org/index.php/Main_Page
>
>    Luis
Will drop legacy support from patch and look closer at this.

Thanks,
  Scott