Re: [PATCH] autofs - make autofs4 Kconfig depend on AUTOFS_FS

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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.
> 
> 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@xxxxxxxxxx>
> Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Tested-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

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.
> 


-- 
~Randy



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