linux-kernel - Re: [PATCH 1/2] ion: Don't allow building ION as a module.

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Date:	Sat, 14 Dec 2013 14:19:01 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Jesse Barker <jesse.barker@....com>,
	Colin Cross <ccross@...roid.com>
Subject: Re: [PATCH 1/2] ion: Don't allow building ION as a module.

On 12/14/2013 01:48 PM, Greg KH wrote:
> On Sat, Dec 14, 2013 at 12:06:45PM -0800, John Stultz wrote:
>> ION doesn't export the proper symbols for it to be a module. This
>> causes build issues when ION is configured as a module.
>>
>> Since Andorid kernels rarely use modules (I think recent policy
>> requires no modules?), go ahead and set the ION config to a bool
>> from the tristate option.
>>
>> If folks decide ION as a module is important, we will have to go
>> through and export the various needed symbols.
>>
>> Signed-off-by: John Stultz <john.stultz@...aro.org>
>> ---
>>  drivers/staging/android/ion/Kconfig | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/android/ion/Kconfig b/drivers/staging/android/ion/Kconfig
>> index a342d96..b95281e 100644
>> --- a/drivers/staging/android/ion/Kconfig
>> +++ b/drivers/staging/android/ion/Kconfig
>> @@ -1,5 +1,5 @@
>>  menuconfig ION
>> -	tristate "Ion Memory Manager"
>> +	bool "Ion Memory Manager"
> Or you can do:
> 	depends on m
> and leave it as a "tristate", then when switching it off, I think you
> can then be prompted as 'm' again, but I could be wrong about that.
>
> So should ION ever be able to be built as a module in the future?
My understanding is that Android is moving away from using modules, but
others could comment more authoritatively. So I don't think this is an
issue. But as I said in the patch, if folks do want to have ION as a
module, we'll have to export all the various symbols that ION users need.

thanks
-john

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