linux-kernel - Re: [PATCH] autofs - make autofs4 Kconfig depend on AUTOFS

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Date:   Mon, 21 May 2018 12:17:49 +0800
From:   Ian Kent <raven@...maw.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        autofs mailing list <autofs@...r.kernel.org>,
        Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] autofs - make autofs4 Kconfig depend on AUTOFS_FS

On 21/05/18 10:08, Randy Dunlap wrote:
> On 05/20/2018 06:04 PM, Ian Kent wrote:
>> Setting AUTOFS_FS and AUTOFS4_FS to y or m results in a compile
>> failure.
>>
>> It isn't possible to unset one if the other is set because it
>> introduces a circular dependency.
>>
>> But adding "depends on AUTOFS_FS = n && AUTOFS_FS != m" will make
>> autofs4 appear under the autofs entry which should call attention
>> to it. It also results in AUTOFS4_FS being removed from .config
>> for any setting of AUTOFS_FS except n.

Arrgh!

I missed that "&& AUTOFS_FS != m" in the description.

Andrew, let me re-post this patch with this fixed and with the
added annotations for Randy below.

>>
>> Adding a "NOTE" to the AUTOFS4_FS help text will hopefully raise
>> awareness of the change to smooth the transition.
>>
>> Signed-off-by: Ian Kent <raven@...maw.net>
>> Cc: Randy Dunlap <rdunlap@...radead.org>
> 
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Tested-by: Randy Dunlap <rdunlap@...radead.org>
> 
> Thanks.
> 
>> ---
>>  fs/autofs4/Kconfig |    8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/fs/autofs4/Kconfig b/fs/autofs4/Kconfig
>> index 53bc592a250d..2c2fdf989f90 100644
>> --- a/fs/autofs4/Kconfig
>> +++ b/fs/autofs4/Kconfig
>> @@ -1,6 +1,7 @@
>>  config AUTOFS4_FS
>>  	tristate "Kernel automounter version 4 support (also supports v3 and v5)"
>>  	default n
>> +	depends on AUTOFS_FS = n
>>  	help
>>  	  The automounter is a tool to automatically mount remote file systems
>>  	  on demand. This implementation is partially kernel-based to reduce
>> @@ -30,3 +31,10 @@ config AUTOFS4_FS
>>  	  - any "alias autofs autofs4" will need to be removed.
>>  
>>  	  Please configure AUTOFS_FS instead of AUTOFS4_FS from now on.
>> +
>> +	  NOTE: Since the modules autofs and autofs4 use the same file system
>> +		type name of "autofs" only one can be built. The "depends"
>> +		above will result in AUTOFS4_FS not appearing in .config for
>> +		any setting of AUTOFS_FS other than n and AUTOFS4_FS will
>> +		appear under the AUTOFS_FS entry otherwise which is intended
>> +		to draw attention to the module rename change.
>>
> 
>