linux-kernel - Re: RFC: out-of-tree tty driver breakage (changing ASYNC

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Date:	Tue, 28 Jun 2016 15:54:49 +0000 (UTC)
From:	Grant Edwards <grant.b.edwards@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-serial@...r.kernel.org
Subject: Re: RFC: out-of-tree tty driver breakage (changing ASYNC_ bits)

On 2016-06-28, Grant Edwards <grant.b.edwards@...il.com> wrote:
> On 2016-01-11, Peter Hurley <peter@...leysoftware.com> wrote:
>> On 01/11/2016 07:53 AM, Grant Edwards wrote:
>>> On 2016-01-11, Greg KH <gregkh@...uxfoundation.org> wrote:
>>>> On Sun, Jan 10, 2016 at 01:42:44PM -0800, Peter Hurley wrote:
>>>>
>>>>> This will break out-of-tree drivers but I don't really see a
>>>>> realistic alternative. Also, I think the new symbol prefix ASY_ isn't
>>>>> great and I'd like to get some suggestions.
>>>>
>>>> Don't worry about breaking out-of-tree drivers, that's fine.
>>> 
>>> One request from this maintainer of several out-of-tree drivers: if
>>> you break something, break it such that it won't compile.  It would be
>>> nice to avoid changes that break functionality but still compile
>>> without warning.
>>
>> I was in the process of writing how I can't remove
>> ASYNC_INITIALIZED, et.al from the uapi header, when I realized that
>> I can just guard them with #ifndef _KERNEL_ which will trigger the
>> requisite out-of-tree build break.

> You know that _KERNEL_ is defined when when compiling kernel-space
> code (either in-tree or out-of-tree), right?

Ignore that.  I missed the 'n' in #ifndef.  My driver build should
fail due to ASYNC_INITIALIZED being undefined, but it isn't.  :/

For some reason _KERNEL_ is not defined when my module is being
compiled....

-- 
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