Re: [PATCH] CIFS: SMBD: fix configurations with INFINIBAND=m

[Arnd Bergmann]

On Tue, Dec 19, 2017 at 11:33 AM, Stefan Metzmacher <metze@xxxxxxxxx> wrote:
> Hi Arnd,
>
>> diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
>> index 500fd69fb58b..3bfc55c08bef 100644
>> --- a/fs/cifs/Kconfig
>> +++ b/fs/cifs/Kconfig
>> @@ -199,6 +199,7 @@ config CIFS_SMB311
>>  config CIFS_SMB_DIRECT
>>       bool "SMB Direct support (Experimental)"
>>       depends on CIFS && INFINIBAND
>> +     depends on CIFS=m || INFINIBAND=y
>>       help
>>         Enables SMB Direct experimental support for SMB 3.0, 3.02 and 3.1.1.
>>         SMB Direct allows transferring SMB packets over RDMA. If unsure,
>
> Is this really correct? Should CIFS_SMB_DIRECT be allowed with:
>
> CIFS=n and INFINIBAND=y ???
> or
> CIFS=m and INFINIBAND=n ???
>
> I guess a more complex logic should be used here
> or am I missing something?

The two ones you listed are prohibited by the existing
'depends on CIFS && INFINIBAND' dependency.

We could rephrase the dependency as

depends on (CIFS=y && INFINIBAND=y) || \
            (CIFS=m && INFINIBAND=y) || \
            (CIFS=m && INFINIBAND=m)

which has the same effect as

      depends on CIFS && INFINIBAND
      depends on CIFS=m || INFINIBAND=y

but I don't think that adds any clarity.

      Arnd